Search results for: 'amino pro'

We expanded our portfolio of Fmoc-protected homo amino acids . Benefit of their unique properties to modulate the stability, hydrophobicity, and biological performance of your peptide!

HMPO (5-(hydroxymethyl)pyrogallol orthoester), a plasma-stable, pH-sensitive, 1,6-self-immolative crosslinker derived from the natural product gallic acid. Discover its properties!

Discover MYTsA as coupling reagent for peptide synthesis in “traditional” C→N and vice versa in “natural” N→C direction. Avoid racemization and benefit of improved atom economy!

You missed our Workshop with Prof. Thomas Carell? As unpublished data was shown, the recording of the workshop will just be available on our homepage in a few weeks. If you would like to be informed please get in contact via info@iris-biotech.de.

Tetrahydropyranyl (THP) is an excellent protective group for hydroxy and thiol moieties but rarely used in solid-phase peptide synthesis (SPPS). Discover its advantages, e.g., over O/S t Bu and Trt.

Collect information about the most common side reactions during Fmoc SPPS and how to avoid them! Choose your building blocks and conditions wisely to avoid unnecessary trouble!

To address both chemical and IP considerations in self-immolating linker applications , we propose shifting from the commonly used Val-Cit-PAB linker to the less explored Gly-Gly-Phe-Gly-formyl motif.

Discover the diversity of TentaGel® Resins ! Read our blog to get more information about our latest product additions and possible applications and find the right resin for your research endeavors!

Where does life come from and how can we simulate early earth conditions leading to simple organic molecules such as nucleotides and amino acids, the building blocks of RNA and peptides?

Cyclophase Synthesis - Dissolve. React. Precipitate. Filter. Repeat! Make your peptide synthesis greener by avoiding DMF and benefit from the advantages of both liquid and solid phase synthesis.

Same but different! Expand your possibilities for peptide modification and fine-tuning by implementing N ω -carbamoylated arginine building blocks as bioisosteric arginine analogs.

Mix & Match. Discover typically employed protecting groups used to temporarily mask reactive functional moieties during solid-phase peptide synthesis to prevent undesired side-reactions.

Shaken, not stirred. Amino-Li resin – a cross-linked polyacrylic amide solid support suitable for the synthesis of peptides and biomolecules, which is compatible with organic as well as aqueous solvents.

Amino-Li resin – a cross-linked polyacrylic amide solid support suitable for the synthesis of peptides and biomolecules, which is compatible with organic as well as aqueous solvents. 

What’s new? Don’t miss innovative building blocks and latest technologies – have a look at our new products flyer and discover our portfolio additions from January to June 2024!

Get the most out of your synthesis! Monitor your deprotection and coupling steps for completion and optimize your reaction protocols to maximize yields and minimize side-products! 

You missed our workshop featuring Prof. Thierry Brigaud? Watch the Recording!

Encode beads with unique tags for combinatorial syntheses & screening. Build libraries & identify hits. Discover properties and applications of our novel bifunctional TentaGel® resins.

Wondering about the difference between Boc and Fmoc chemistry in solid phase peptide synthesis? Don't worry: in this short overview we will guide you through the basics of both strategies.

Use the possibilities of Linkerology® to boost the efficacy of your drug! We illustrate how the drug Gepirone (Exxua TM ), a medication to treat major depressive disorders, can be conjugated.

Proposing norbornenes – strained, bicyclic alkenes for fast, copper-free, biocompatible click-conjugation with tetrazines. Read on for more details on applications and available products!

Clever Move - Add positive effects to your molecule by introducing the most electronegative element. Discover fluorinated building blocks as game changer for your lead development. 

Level up! Carboxymethyl-modified amino acid building blocks suitable for incorporation by solid-phase peptide synthesis. Learn more about available derivatives and their properties.

Discover photocages – photosensitive protecting groups that are removed by irradiation with light of a defined wavelength, thus restoring the original, “active” state.

Have an additional ace up your sleeve for selective and efficient peptide modification, cyclization, and/or bioconjugation. Explore 2-cyanopyridines for click-like reactions. Get more information!

Beyond cysteines: Unlock targeted side-chain modifications of your peptides and proteins via the introduction of 1,2-aminothiols and subsequent click-like functionalization. 

Engineer shape-shifting peptides , controllable by a laser as magic wand! In this newsletter, we’ll explore the possibilities of photo switchable building blocks based on azobenzene.

You are looking for monodisperse Sarcosines ? You want to use Sarcosine for SPPS? You need to improve your drug's hydrophilicity and search for PEG alternatives? Read on!

You missed our workshop featuring Dr. Fabio de Moliner & Prof. Dr. Marc Vendrell? Watch the Recording! Any further questions? Please get in contact via info@iris-biotech.de.

Boron is not boring at all! Today, we'll delve deeper into the exciting world of boronate-containing amino acid building blocks and unlock the potential of the next generation of peptides. Read on!

The targeted delivery and traceless release of drugs is an important concept in pharmacology. Discover the possibilities of payload conjugation to carrier proteins shown for the example drug Elacestrant.

Explore phenylisopropylesters (OPP/OPis) as carboxy protecting groups. Facilitate your peptide synthesis with building blocks for precise side chain modifications or seamless macrolactamizations. 

You are looking for a building block suitable to control the folding characteristics of your peptide or want to add a pH-sensitive conformational switch? Discover aminoprolines and their properties!

Live-imaging of dynamic structures and catching events in living cells is a challenge, as most fluorescent probes have a high background signal. For alternatives, please read on!

Are you keen on developing novel billion-dollar-selling peptide API blockbusters? Most recent ones use lipophilic Albumin binding moieties. Of course, Iris Biotech has the necessary building blocks!

The tetrazole isostere of malonyllysine is thermally stable and does not suffer from decarboxylation. Discover our building blocks suitable for incorporation via solid-phase peptide synthesis.

REACH regulation for the handling of N , N -dimethylformamide (DMF), the most commonly used solvent for solid-phase peptide synthesis (SPPS). Read more about consequences and alternatives!

Increase your peptide’s stability, introduce an NMR label for analysis, or enhance lipophilicity. Read our blog to discover our latest toolbox additions in the field of non-canonical amino acids.

Our special Christmas offer is still valid! Get our standard L-amino acid bundle with 30% discount compared to standard prices. Choose your packaging unit!

Curious about the highlights of our 2023 portfolio additions? Discover innovative building blocks and latest technologies! Read on to check out the summary or get in contact if you need more details!

You missed our workshop featuring Dr. Quibria Guthrie (CEM Corporation)? Any further questions? Please get in contact via info@iris-biotech.de.

Discover possibilities to fight chronic pain diseases by employing linker technologies. Check out the options for multiple drug conjugation in combination with different release mechanisms.

Do not miss our special Christmas offer starting on December 1st!

Add glycans to your proteins with our ready-to-use Fmoc asparagine building blocks suitable for solid phase peptide synthesis and produce peptides with exactly defined glycosylation patterns!

The discovery of the Merrifield peptide synthesis paved the way for automated solid-phase peptide synthesis (SPPS) enabling fast and convenient simultaneous peptide synthesis.

Discover our small-sized, neutral Fmoc-protected nitrobenzoselenadiazole- and nitrobenzothiadiazole-modified amino acids suitable for SPPS of fluorescent peptides. 

One molecule, two identities: PNAs are composed of nucleobases arranged on a peptidic backbone. Discover our PNA building blocks as ready-to-use bases suitable for SPPS.

Sick of Lysine side chain protecting groups jumping around, yielding scrambled peptides? Check our various options to fine-tune protecting group stability vs. cleavability to optimize your peptide yield.

Keeping control! PEGylating reagents with a squaric acid ethyl ester react chemoselectively with side chain amino functions of surface-accessible Lysines in proteins. Other functionalities are not affected.

Discover our new building block 4-(azido-propyl-tetrazine)phenylalanine (pTAF) and make use of the orthogonality of the 2 nd and 3 rd generation Click reaction to build multiconjugates via double-Click.

Bioengineering in combination with Linkerology® . Check out the unique options for membrane proteins, recombinant immunotoxins (RITs) and novel antibody-drug conjugates.

The potential of natural products of daily life , such as 6-shogaol from ginger ( Zingiber officinale) , can flourish if the active ingredient is conjugated to an appropriate carrier via Linkerology®. 

Allotropes of carbon show distinct characteristics in structure and e.g. electric and biophysiological properties. Discover how these materials can be further exploited by linker attachment!

Discover the cyanobenzothiazole (CBT) click reaction , a not (yet) so well-known biocompatible and bio-orthogonal mechanism faster than the famous azide-alkyne cycloaddition (CuAAC).

Curious about our latest portfolio additions from January to June 2023? Discover our New Products Flyer and check out the summary of recent product highlights! Get in contact for more details!

Add a new dimension of orthogonality to your peptide synthesis by using Safety-Catch arylalkyl sulfoxide protecting groups! This newsletter tells you about benefits and usage – Read on!

Discover our diazirine-substituted building blocks suitable for the analysis of protein-protein and RNA-protein interactions via proximity labeling upon photoactivation. Read on for more information!

Plasma technology allows to equip inert polymers such as poly(ethylene) or polystyrene with functional groups like amine or carboxylate enabling further conjugations and applications. Read on!

Shine bright like our fluorophores! Learn how our superior fluorogenic protease substrate peptides can enhance your test performance. Click here to gather more information and discover available products!

Building blocks with a strained triple bond do not require copper catalysis when used in click chemistry. Discover CliCr®: improved solubility in aqueous conditions and high reactivity! Click here!

Peptide therapeutics – fewer injections/lower doses by prolonging their half-life via addition of a lipid modification that promotes binding to serum proteins such as albumin. Read on for recent innovations!

From beginning of May until end of July 2023 we offer special polysarcosine bundles each containing three functionalized PSars of different molecular weight (5 kDa, 10 kDa, 15 kDa), 100 mg each.

From evolution to solution - natural products are an infinite source of (bio)active compounds. In this series we present how natural products can be conjugated to empower their inherent potential.

Our monofunctionalized dextrans are enriching the toolbox of polymer therapeutics – Dextrans benefit of excellent solubility, biocompatibility, biodegradability, and non-immunogenicity.

Non-canonical Tryptophan analogs can help to improve your API’s performance in terms of potency, specificity, and stability. We offer various substituted Trp derivatives also available in small quantities for screening.

Coupling Reagents are required for the formation of an amide or ester bond. As simple as those reactions seem to be, the choice of the appropriate reagent is crucial for optimizing purity and yield.

Maleimides provide versatile options for connecting payloads to proteins and other biomolecules. Discover how our bifunctional thiol reactive crosslinkers can support your project. Read on!

Herein, we present functionalized perfluorobiphenyl building blocks which can be used for site-selective π -clamp mediated cysteine conjugation. Read on for more details about this general method!

PEGs are being used as spacers, as hydrophilic decoration, and building blocks. Read on for more detailed information about the reactivity of different PEG derivatives and how to use them.

Argpyrimidine is the result of a Maillard Reaction-like nonenzymatic posttranslational modification. You want to investigate the effect of this change on function and stability? Get the building block!

(Bi)functional dioxoborolane and disulfide-based self-immolative linkers – mode of action and application examples for the detection of H 2 O 2 , for prodrug design, and reversible peptide cyclization.

You want to get an overview about the different Click technologies as well as available derivatives and applications? Let’s arrange a (virtual) talk by Iris Biotech about your topic of choice – Contact us!

In two joint studies together with Prof. F. Albericio we investigated the coupling efficiencies of Ser and Thr pseudoproline monomers and their use for the synthesis of inaccessible peptide sequenes. Read on!

Curious about our latest portfolio additions from July to December 2022 and the 2022’s overall product and newsletter highlights? Click here to check out the summary or get in contact for more details!

Herein we investigate the incorporation of the Fmoc-Thr-pseudoproline monomer during Fmoc SPPS. Typically, pseudoprolines are incorporated as preformed dipeptides. However, the possibility of using the monomer adds flexibility to the synthesis.

We can’t get enough of new products and innovations! Read this blog to get detailed information on the cyanylating reagent NTCB as well as selenocysteine amino acids, both useful tools for peptide ligation.

Jensen et al. developed two methods that use poly-His sequences to direct the highly selective acylation of proteins, either at the N-terminus or at a specific Lys residue. Read on for more information.

See how our “mRNA grade” DTT and Spermidine can support also your nucleic acid production. Read on for more information.

The ChemMatrix® resin production and distribution was discontinued by its manufacturer SEQENS. Products are only available at Iris till current stock is sold out. Read on for more information!

You are working on complex peptides and are looking for a new level of orthogonality facilitating the overall synthetic process and improving your yields? Check out the Msbh safety-catch protecting group!

You missed our workshop featuring Dr.-Ing. Sascha Knauer and Dr.-Ing. Christina Uth (Managing Directors; Sulfotools)? Any further questions? Please get in contact via info@iris-biotech.de.

From mg synthesis of a peptide up to bulk quantities often makes a huge difference in the route of production. Read on for more information about Iris Biotech’s process development services.

Herein, we report the first-time SPPS of a special peptide sequence via employment of of a serine pseudoproline building block as well as sec-isamyl mercaptan (SIT) as cysteine protecting group.

Herein, we present the Clean Peptide Technology using Smoc Amino Acids developed by Sulfotools in Germany. Replace organic solvents with water during peptide synthesis - Read on for more information!

You want to get an overview about the various resins available at Iris Biotech as well as their specifications, differences, and applications? Read on for further information and details.

The Dawson Linker and its variants provide access to C-terminal peptide thioesters which are crucial components of Native Chemical Ligation reactions. Read on to discover all derivatives available at Iris Biotech!

The para -azido benzyloxycarbonyl protected lysine building block Fmoc-L-Lys(4-N3-Z)-OH (FAA8830) is useful for a wide range of applications. Read on to find out more!

Photoswitches grant the ability to modulate the function of a molecule by effecting a structural change upon irradiation with UV light. Find out about our photoswitchable building blocks and their properties.

You missed our workshop featuring Prof. María Jesus Vicent Docón (Head of Polymer Therapeutics Lab)? Any further questions? Please get in contact via info@iris-biotech.de.

Dyes and fluorescent labels are an invaluable tool for diagnostics, medical and biochemical research. Iris Biotech offers labels with excitation ranges from UV to near-IR and various functional groups.

For selected products we added minimum purity and minimum enantiomeric purity as part of our product description on our website. High product qualities at Iris Biotech – Read on for more info.

Replace undesired solvents such as DCM, THF and DMF during the loading of 2-CTC and 4-MBH-Br resin by a “greener” EtOAc/MeCN (1:1) mixture. Click here and read on for more details.

Discover our products suitable for drug delivery including poly ethyleneglycols (PEGs), poly amino acids (PArg, PGlu, PLys, POR, PSar), poly(oxazoline)s, as well as fullerenes. Read on to find out more!

Iris Biotech is your trusted partner in the world of peptides and all related disciplines. Your project requires a compound not listed in our portfolio? Get in contact and inquire for a custom synthesis!

Iris Biotech offers the main building blocks for the synthesis of Liraglutide and Semaglutide and commonly observed impurities as well as reference standards. Read on for more information!

We are providing variously functionalized, protected and unprotected fatty acid derivatives suitable for SPPS and further conjugation, e.g. via Click chemistry. Read on to discover our portfolio.

Oxidation is not only a known degradation pathway of proteins and peptides in vivo but is also a major side reaction for certain amino acids during peptide synthesis in vitro. Read on to discover our available building blocks.

Discover our selection of disulfide-based self-immolative linkers allowing to influence linker stability, fine-tune the self-immolative cleavage rate and thus impact the speed of the payload release.

Interested in polymers for the delivery of promising drug candidates, e.g. nucleic acids? Discover our selection of lipidated polyamino acids and custom capabilities. Read on to find out more!

Interested in the introduction of Sarcosine (N-methylglycine), e.g. for hydrophilicity increase of your derivative of choice or for PEG replacement? Check-out our available Sarcosine building blocks!

Herein, we present building blocks for the synthesis of protected hydroxylamine derivatives which can be further used for bio-conjugation and various other applications. Read on to find out more!

Discover our selection of propargyl-substituted amino acids and find the best position for subsequent Click chemistry within your peptide/protein. Just click here for further information on our products.

Looking for an acid stable protecting group? Struggling with undesired loss of the Cbz protecting group while removing Boc under acidic conditions? Read on to find out more about iNoc as alternative.

Discover our selection of substrates for Halo-, Snap-, and Clip-tagged proteins bearing different terminal groups suitable for further functionalization, e.g. biotinylation and Click chemistry.

Herein, we summarize certain product highlights and innovations, which we presented in our newsletters 2021. Have a look and get in contact for more information or an individualized offer.

See a summary of our advent calendar surprises and benefit from special discounts and great offers! Interested? Just click here to check-out all available products.

Common protocols for the loading of 2-CTC and MBH-Br resins presume the application of DCM, THF, or DMF; these solvents are considered as undesirable in accordance with modern regulatory rules.

You missed our workshop featuring Prof. Dr. Fernando Albericio (University of KwaZulu-Natal & University of Barcelona)? Any further questions? Please get in contact via info@iris-biotech.de

Herein we present a series of alpha,alpha-cycle-disubstituted amino acid derivatives used in peptide design for their structure promoting effects as well as conformational rigidity.

Herein we are reporting on the linker stability of amino-PEG-acids achieved via N-methylation and the possible side-reaction without this additional modification. Read on to find out more!

Typically known and employed as preformed dipeptides, we are presenting Serine- and Threonine-derived Pseudoproline monomers as building blocks for solid-phase peptide synthesis.

Check out our growing portfolio on adamantyl-substituted amino acids and building blocks. At Iris Biotech, we are constantly striving to improve our services, our products, and the routes of synthesis.

Discover our selection of Halo ligands as haloalkane dehalogenase substrates, bearing different terminal functional groups suitable for further conjugation, e.g. via Click chemistry.

Polysarcosines (PSars) – a true alternative to polyethyleneglycols (PEGs) - stand out in terms of safety, synthetic control, and versatility. Interested? Read on to find out more about their properties.

Back in the lab after enjoying your holidays? Motivated to run new experiments but lacking certain building blocks or standards? Check out our huge portfolio or get in contact for our special offers!

Discover the versatile applications of hydrazone resins e.g. for the preparation of peptide hydrazides, or the generation of peptide thio esters. Read on to find out more and see our available products.

October 18-19, 2021

Selenocysteine (Sec) plays a crucial role for various biological processes, and selenoproteins can be found in all lineages of life. Read on to discover the 21 st amino acid, its derivatives and applications.

Read on for more information about the right handling of Maillard Reaction Products (MRPs), which are frequently used as analytical standards related to food quality and disease processes.

Herein we are presenting 2-(Fmoc-amino)-3,3-diMe-pent-4-enoic acid (FAA5040), a protease stable Ile/Leu surrogate suitable for further modification via its side chain double bond.

Aspartimide formation remains one major hurdle during peptide synthesis. Read on to find out more about different strategies and available products at Iris Biotech in order to avoid this side product.

Iris Biotech offers a variety of (functionalized) biotin and desthiobiotin reagents reactive towards certain functional groups. Discover our growing portfolio and latest additions.

Herein, we present Fmoc-protected N-alkyl-substituted carboxy linkers, which can be elongated by Fmoc-SPPS and can easily be linked to amino-functionalized solid supports. Read on to find out more about their advantages.

Compounds of the shown formula can simply be bound to solid supports via amide bond formation without racemization of the C-terminal amino acid and enable the synthesis of very pure peptides.

The peptide-based ADC linkers Val-Cit and Val-Ala are efficiently cleaved by lysosomal proteases and benefit from increased serum stability and effective payload-release in targeted cells.

The incorporation of alpha-trifluoromethyl substituted amino acids into peptides increases proteolytic stability, enhances lipophilicity, and induces secondary structures. Read on to find out more!

Interested in structure-activity studies of your Proline-containing peptide drug? Find out more about the use of Methanoprolines and Dimethylprolines as conformational amide locks.

Serine- and Threonine-derived oxazolidines as well as Cysteine-derived thiazolidines, so-called Pseudoprolines, serve as structure-disrupting, solubilizing building blocks in peptide synthesis.

Interested in studying the effect of palmitoylation on your peptide’s localization, function, and stability? Read on to find out more about the use of lipidated “fatty” amino acids!

Cys(Aapam): an Alloc protected Phacm linker as removable side chain modification for the incorporation of e.g. solubilizing tags facilitating the preparation of hydrophobic peptides and proteins.

Interested in structure activity studies on your Arginine containing peptide or further optimization for improved receptor binding? Explore our guanidino Proline derivatives as rigid Arginine mimics.

Are you using the Fmoc-MeDbz-OH Dawson Linker in large scale on a regular basis? A robust and economic processallows us to promptly provide you with kg quantities at competitive prices and in high quality.

Herein we present substituted diazacyclononynes (DACNs) as versatile tools for metal-free strain-promoted Click Chemistry that are characterized by high reactivity and stability, both thermally and chemically.

The highly lipophilic, bulky adamantyl motif is a promising and validated building block to increase the drug-qualities of lead compounds without increasing their toxicity.

An efficient, versatile linker developed for the synthesis of C-terminal primary/secondary amides and hydrazides as well as peptide alcohols, which is compatible with SPPS and suppresses side reactions.

Herein, we present aminooxy-amino acids reported for peptide synthesis via oxime ligation, cyclization via oxime formation, derivatization e.g. by glycosylation, or chelation. Read on to find out more.

Herein we present two arginine derivatives, in which the native guanidino group is replaced by an isosteric amino-functionalized carbamoylated guanidino group that can serve as an attachment point for further derivatization.

The sterical interference of three closely positioned methyl groups favors amide cleavage and payload release upon lactonization. This cascade can be induced by various triggers. Read on to find out more.

January 19, 2021

Interested in the formation of peptide thioesters for Native Chemical Ligation? Read on to find out more about the use of Dawson Linker derivatives as thioester surrogates compatible with Fmoc SPPS.

Enzymatically-activatable probes based on 7-amino-4-methylcoumarin (AMC) represent versatile tools for the detection and localization of proteolytic enzyme activities. Read on to find out more.

Methionine is particularly prone to oxidation by atmospheric oxygen in vitro but also by reactive oxygen species in vivo, resulting in the corresponding sulfoxide and sulfone. Read on to find out more.

One approach for the design of bioactive peptides with improved pharmacological properties is the derivatization of amino acid building blocks with fluorine. Find out more about the advantages of fluorinated peptides.

Interested in histidine derivatives? Iris Biotech provides a selection of deamino- and decarboxy-products. Find out more about benefits and potential applications of our new building blocks.

Fighting COVID-19 by modifying essential viral proteins via glycation through methylglyoxal – a reactive carbonyl compound known from the Maillard reaction. Read on to find out more!

Iris Biotech presents its selection of Val-Cit-based linkers, a dipeptide motif frequently utilized for the development of ADCs with increased serum stability and high cleavage efficiency.

Iris Biotech presents (functionalized) fullerenes of different core size (C60 vs. C70) as versatile tools for multiple functionalization. Read more about their unique properties and fields of applications.

Iris Biotech presents the next-generation of hydrolysis-stable phosphono-analogs of pSer, pThr and pTyr. Fluorination renders the phosphonic acid more acidic and thus an even better mimic of the parent phosphoamino acid.

Find out more about those building blocks with side chains able to coordinate metal ions, and why peptide-based HDACis are intriguing synthetic targets.

Learn, how His-Tag can be used for specific linker attachment. Another example in our LINKEROLOGY series of sophisticated linker technologies.

Amongst various somatostatin analogues, the pentacyclic heptapeptide TT-232 bears unique properties. Iris Biotech offers TT-232 as triacetate and trifluoroacetate salt, respectively, as well as conjugated to either biotin or the fluorophore indocyanine green.

Find out more about our partner SciClix from Singapore and our new collaboration!

Find out which Maillard Reaction Products from Iris Biotech were used in the development of a state-of-the-art analytical method for 15 different AGEs.

Placing Dde as one terminal group of a linker and a functional group prone for conjugation as the other or using Dde as the central connective portion of a linker, allows for the creation of new bifunctional linkers.

Alkyne amino acids allow for Click conjugations and other types of chemistry. Read more about alkyne-functionalized amino acids and our related products.

DTT is a powerful yet mild reducing agent. Based on your demand we can offer different quality grades to suit your needs.

Sidechain-derivatized amino acids have shown great potential in enhancing select properties of peptide lead compounds. Find the most recent additions to our portfolio of amino acids bearing additional aryl and alkyl groups in their side chains.

Peptide purification after SPPS usually requires time- and solvent-consuming HPLC, which is often limited by co-eluting side-products. Belyntic’s catch-and-release PEC-Linker chemoselectively catches the desired product from your crude to reach a new dimension of purity.

The tremendous success of Liraglutide and Semaglutide has moved amino acids modified with lipids into the focus of many research endeavors. Delve into the treasure trove of our lipidated amino acids!

The presence of phenyl groups in APIs is connected with various disadvantages. An increasingly popular solution is the use of BCP as a phenyl ring bioisostere. Find out more about this highly diversifiable motif.

Our distribution partner in Mumbai / India, Sumit Biosciences Pvt Ltd., recently opened a new warehouse in Mumbai to stock various Iris Biotech products from our amino acids and resins product ranges. Stocked pack sizes range from 5 g to 1 kg.

Betulin and its derivatives are pentacyclic triterpenoids of the lupane-type. They are natural products that occur as secondary metabolites in over 200 different plants. Betulinic acid (BA) is a derivative of betulin that is oxidized at C-28.

Arginine, a semi-essential amino acid, is involved in various important metabolic processes.

Proximity labeling of proteins with biotin-phenol (biotin-tyramide) and an engineered peroxidase enzyme (e.g. APEX = Engineered Ascorbate Peroxidase) is a pivotal tool for molecular biology.

21 - 22 October 2019

The Allocam protecting group allows for selective deprotection and disulfide bond formation on-resin in one step.

Two selected publications were summarized in this article in order to highlight the impressive utility of amino acids incorporating the diazirine photophore.

Protease inhibitors are molecules that inhibit protease function by binding either reversibly or irreversibly to the enzyme.

o -Nitroveratryloxycarbonyl (Nvoc) is a photocleavable side chain protecting group for lysine that can be removed by irradiation with UV light (350 nm).

Succinylation of proteins on the epsilon-amino group of lysine residues is a posttranslational modification that is still poorly understood.

10-13 September 2018

August 26-31, 2018

Phosphorylation of serine, threonine and tyrosine is counted among the most important posttranslational modifications that occur in organisms.

Iris Biotech introduces a comprehensive set of photo-crosslinking amino acids bearing the diazirine moiety.

The most common reagent for the Fmoc-protection of amino acids is currently Fmoc-OSu, followed by Fmoc-Cl. However, the use of these reagents is usually accompanied by several side reactions, such as the formation of beta-alanine and dipeptides.

The use of bioactive peptides has increased over the recent years as they attracted attention for their use as therapeutic agents.

Polyarginines are well known for their ability to enhance cell penetration.

Poly-(α-L-glutamic acid) is a synthetic polypeptide of L-Glu linked by the alpha-amino groups (α-PGA). These polyanionic and biodegradable polymers can be used for a variety of purposes.

Amino acids of high quality are crucial for the synthesis of peptides with a high purity.

Polylysines are polymers of the canonical amino acid Lysine, and are characterized by their high charge density caused by the presence of one free amino group per lysine monomer.

Mercapto-PEG-Acids are highly hydrophilic, non-antigenic, non-immunogenic and non-toxic.

Mutant or modified aminoacyl tRNA synthetases (aaRS) have been used to charge non-natural amino acids to the corresponding tRNA, which incorporates them into polypeptides or proteins during recombinant synthesis.

As Boc and Fmoc protected derivatives of both azido and alkyne amino acids are available, they can be introduced into peptide sequences through standard SPPS protocols, for example. In an α-helical secondary structure amino acids at positions i and i+4 are above each other.

The azido group can be reduced to an amino function and hereby serve as masked amino group. It is of particular use if additional orthogonalities are needed. Azido is stable towards treatment with piperidine (Fmoc deprotection), Pd(0) (Alloc removal) and acidic treatmet (cleavage of Mtt, Trt or other acid sensitive groups). However, as it is a pseudohalogenide, care has to be taken during coupling steps, as HATU will cause high racemization. This can be avoided using collidine or other non-nucleophilic bas...

Diethyl-acetamidomalonate Route: The probably most widely used first approach to unnatural amino acids goes via alkylation of diethyl acetamidomalonate.

Asymmetric Phase-Transfer Reaction Phase-transfer alkylations e.g. with the chiral Maruoka catalyst result in unique α-mono substituted and α,α-disubstituted unnatural amino acids.

α-Methyl and alkyl-amino acids can be produced by a number of platforms, where the (2S,4S)-4-methyl-2-phenyloxazolidin-5-one scaffold is one of the most popular one.

The incorporation of trifluoromethyl group carrying building blocks into peptides results in increased chemical and thermal stability, increased resistance to degradation by proteases, and enhanced lipophilicity.

Trypsin (EC 3.4.21.4), an endopeptidase and natural protease found in the digestive system, cleaves peptide chains and proteins predominantly at the carboxyl side of the amino acids Lys and Arg (except when followed by Pro).

The variations for linkers are endless, as in our catalogue program already hundreds of different derivatives are available for conjugation of small molecules, biomolecules and surfaces to each other.

Proteins contained in meat and other comestible goods are usually rich in the amino acids arginine and lysine. The side chain func- tional groups of Arg and Lys react with reducing carbohydrates such as glucose or lactose to form Amadori reaction products.

The polymers in this context are a polymeric linear structures with n repeating units of monomers. Depending whether the polymer is consisting of one single molecular weight (only one n existing) or of a range of compounds with an average mass and a distribution of n around a mean value, polymers are referred to as “monodisperse” or “polydisperse”.

Polyglutamates are well known to be highly biocompatible, biodegradable and multifunctional polymers, which have already been used as building blocks in polymer drug conjugates and polymeric micelles.

Potential alternatives to PEGs, polypeptoids in general and polysarcosine (PSR) in particular stand out in terms of safety, synthetic control and versatility.

PEGs show a spectrum of unique physical and chemical properties, which have been described in literature extensively by the pioneers in PEGylation: Harris, Veronese and recently by Hermanson. Here are summarized the most common known properties.

Amino protected amino-PEG-acids can be used for the PEGylation of solid particles in order to create hydrophilic and reactive surfaces with no non-specific binding issues.

The Biopharmaceuticals market, estimated at US$ 200 billion globally in 2013 by reportbuyer.com (Biopharmaceuticals - A Global Market Overview, 2013, London), is further projected to reach US$ 500 billion by 2020, growing at 13.5 % CAGR between 2010 and 2020.

Small drug molecules and also large biomolecules like proteins or antibodies suffer rapid clearance from human body.

Abstract: A symposium report. Protected peptides were synthesized using 9-fluorenylmethoxycarbonyl (Fmoc) amino acids and the acid labile 2-chlorotrityl and the multidetachable 2-chlorotrityl-Rink-linker resins.

Abstract: Ditrityl amino acids Trt-Lys(Trt)-OH (Trt = CPh3), Trt-Orn(Trt)-OH, Trt-Ser(Trt)-OH, and Trt-Hse(Trt)-OH were prepared and used in the synthesis of trityl-protected peptides, e.g., Trt-Ser(Trt)-Phe-NH2.

We now offer a series of Lysine dendrons for chemoselective functionalization of molecules containing carbonyl groups. These multivalent molecules carry diverse types of moieties, such as amine- or hydroxyl-groups, DOTA chelators or triphenylphosphonium (TPP) cations.

In this news section, we highlight three useful coupling reagents for peptide chemistry: PyCLOCK, PyAOP and HDMA.

Fmoc-L-Dap(2-Boc-aminoethyl)-OH is the first in a series of new triamino acid building blocks. This azalysine is useful for introducing positive charges into a peptide, or for creating branched structures.

This innovative auxiliary facilitates Native Chemical Ligation at the position of a Glycine residue in a peptide sequence. The auxiliary can be further functionalized, e.g. by PEGylation. Following NCL, the auxiliary is removed by irradiation with UV light.

The classic FRET pair EDANS and DABCYL is now available linked to Fmoc amino acid building blocks that can be readily used in SPPS. Conveniently synthesize your own custom protease substrates!

Omniligase-1 enables efficient and racemization-free ligation of two side-chain unprotected peptide fragments at many different positions. Test this innovative enzyme developed by EnzyPep B.V. using the complementary model peptides included in our kit!

The SCAL linker offers superior chemical stability and permits a variety of orthogonal solid-phase approaches. It is fully compatible with the Fmoc-, Boc- and Alloc- strategies. Cleavage can be performed either by a simultaneous, or by a two-step reduction/acidolysis procedure to afford peptide amides.

Peptides as pharmaceutical compounds suffer from unfavorable pharmacokinetics which is, among other things, due to a slow uptake into cells and rapid proteolytic cleavage. N -Alkylation of peptides is a valuable tool to overcome these limitations. We now offer new kits that enable the facile preparation of peptoids and N -alkylated peptides.

The regioselective formation of multiple disulfide bonds is often a synthetic challenge. We now offer an innovative safety-catch Cys protecting group that allows selective deprotection of the sulfhydryl group and is a valuable addition to the peptide chemist’s toolbox.

Asymmetric Rhodamine 110 protease substrates are used for the determination of protease kinetics. The asymmetric structure of these dyes greatly simplifies the determination of enzyme kinetics, while the properties of Rhodamine 110 facilitate an uncomplicated readout.

Polytriazole ligands such as THPTA accelerate the copper-catalyzed azide-alkyne cycloaddition (CuAAC), or “Click”, reaction. Moreover, with the use of further additives, polytriazoles facilitate CuAAC even in live cells by significantly lowering the bioavailability of the copper catalyst.

Maillard Reaction Products (MRPs) result from the reaction of Arg and Lys side chains with reducing carbohydrates. MRPs are valuable markers for food quality and are used in many different branches of industry such as food, pharma, cosmetics and biochemistry.

2-Furyl-alanine can be incorporated into peptides via SPPS or by using enzymatic approaches. UV-irradiation in the presence of oxygen and a photosensitizer converts furyl-alanine to an intermediate that selectively reacts with certain nucleophiles. This property can be employed for site-specific labeling of peptides and proteins.

The Fmoc-L-Phe-Aca pseudo-dipeptide is a useful reporter group for the successful internalization of CPPs. Phe quenches the fluorescence of Aca. Internalization of the peptide containing Phe-Aca leads to proteolytic cleavage of the Phe-Aca bond and thus to fluorescence.

We now offer  N,N' -Bis-Boc- N" -triflylguanidine , at both a very competitive price and our habitual high quality. Find out about the usefulness of this and our other guanylation reagents!

N δ -hydroxy- N δ -acetyl-ornithine, an important constituent of many siderophores, is now available for your convenience as  N α -Fmoc- N δ -(acetyl)- N δ -(benzoyloxy)-ornithine  building block which can be used in standard Fmoc/ t Bu SPPS and permits facile on-resin  N δ -deprotection.

Click chemistry is a convenient method to chemoselectively functionalize peptides at specific positions. We offer a variety of different propargyl amino acids for both Fmoc and Boc strategies, for enzymatic synthesis, as well as preloaded resins for SPPS.

5-oxa-Derivatives of Orn and Arg, respectively, these rare amino acids are produced by legumes as protection against herbivores. For your convenience, we offer building blocks of both amino acids compatible with standard Fmoc/ t Bu SPPS chemistry

l -Ornithine derivative containing peptides play important roles in SAR studies, enzyme inhibition and cancer research. We now offer a variety of N δ -substituted ornithines containing heterocyclic, aromatic and aliphatic groups, as well as N- substituted C3- and C4-analogs of ornithine.

Pre-packed amino acid cartridges for ABI peptide synthesizers are available for you convenience. Speed up your peptide syntheses with our cartridges containing all 20 standard amino acids for Fmoc/tBu chemistry.

Peptide linkers usually are cleaved under acidic conditions or using two-step procedures. Photocleavage proceeds under neutral conditions using UV light and can either be performed in batch or using flow chemistry.

Bulky glycine analogs are interesting molecules for creating peptide derivatives with certain biological activities, e.g. with antiviral properties. Furthermore, they are useful compounds for protein structure evaluation.

Visit our Glycine section and find a series of amino acid derivatives, where oxazole is the characteristic structural element carrying carboxy and amino function.

Visit our Glycine section and find a series of amino acid derivatives, where oxazole is the characteristic structural element carrying carboxy and amino function.

Oligo-glycines are either flexible linkers or form well defined rigid substructures. We offer a variety of oligo-glycines as building blocks which can easily be introduced into any molecule.

Surprising behavior of NXO-peptides. It is a significant property of peptides that oxalo-retro azapeptides have the same donor and acceptor distances and properties for hydrogen bridge formation as a tripeptide fragment and therefore induce beta-sheet formation at this position.

A set of new statin analogues, so called Super-Threonines, is available consisting of Fmoc protected L-enantiomers with all possible 4 stereoisomers of chiral centers in the side chain. They appear in nature as bridge building element in cyclodepsipeptides, like pipecolidepsin A, a compound which shows relevant cytotoxic activity in three human tumor cell lines (lung, colon, breast) and has unique structural features.

May 27th, 2015 Radboud University Nijmegen, The Netherlands The annual Dutch Peptide Symposium provides a unique opportunity for academic and industrial researchers working in the fields of peptide-, protein-, and amino acid chemistry to meet and exchange ideas, insights, and expertise. The 2015 edition of the Dutch Peptide Symposium will be held in Nijmegen on May 27.

Wang resins are widely used for peptide synthesis. However, certain side reactions, like diketopiperazin formation limit their use. 4-Methylbenzhydryl resin needs more space and leaves less room for this type of side reactions. Standard “Wang-typical” Fmoc/tBu coupling protocols can be applied.

Aldehydes are between alcohols and carboxylic acids with respect to their oxidation level and show specific reactivity. Therefore they are highly interesting building blocks and intermediates for a large number of very interesting classes of reactions and compounds such as Wittig reaction, formation of secondary alcohols, heterocycles and semiaminals to name only a few.

February 10th, 2015 DECHEMA-Haus Frankfurt/Main, Germany   The one-day symposium, organised by the DECHEMA working group on novel bio-production systems, will focus on recent advancements in the production and the application of these artificial proteins.

Positions next to Glycine are often reasons for side reactions, as aspartamide or diketopiperazine formation can occur. Dmb and Tmb can be used for temporary protection of the amide nitrogen of a peptide bond, in order to solubilize the peptide and increase yield and purity.

Peptide hydrazides can be easily synthesized using a new hydrazone resin, obtained via acylation of aminomethyl polystyrene by Fmoc-hydrazone of pyruvic acid.

Maleimide (MAL) reacts rather specific with free thiol groups and forms appropriate conjugates. However, this reaction is slightly reversible, resulting in loss of the conjugation partner. Amino functions open the maleimido ring structure through hydrolysis with nucleophilc neighboring effect and thus inhibit the undesired release reaction.

Aminoisobutyric acid (Aib) and its homologues are a strong helix promoters in peptide mimetics. Aib-containing model peptides are already used in cancer treatment, antimicrobial peptides and cell penetrating peptides (CPP). We offer Aib and its homologues positioning the dimethyl fragment either close to the N- or to the C-terminus.

For introducing amino-PEG-acids into a peptide chain, several affordable building blocks are available with all conventional protecting groups. They can be incorporated at any sequence position by standard coupling protocols.

Fatty Acids for Click Conjugation Fatty acid residues and alkyl chains in general can improve solubility and anchoring in membranes and other Lipophilie environments. Find a selection of promptly available short and long chain clickable acids in our web store. Any other – including functional groups for copper-free Click conjugation can be made on custom synthesis basis.

alpha-Sulfo-beta-Alanine has been used to couple to hydrophobic molecules and peptides and increase solubility. Attachment can be carried out by conventional Fmoc/tBu protocols.

In the era of internet a printed edition of a catalogue still has some advantages and fans. You can make handwritten notes in your catalogue. The overview at each page inspires you to think about structure diversity or alternative strategies in terms of protecting groups, coupling reagents or immobilization. You quickly see what is commercially available and get fast an impression about approximate costs of your synthesis. Order now online >

1,4-substituted 1,2,3-triazole are isosteric to peptide bonds and result in peptide mimetics which even retain activity e.g. in case of certain tyrosinease inhibitors. We offer custom synthesis of Alkyne Amino Acid Analogues as building blocks for triazol formation via Click conjugation. Side chains can represent all natural amino acids or unusual residues. In combination with our alpha-azido acids we can offer the whole range of building blocks to design Click-peptide bond analogues for every proteinoge...

August 31st - September 5th, 2014 National Palace of Culture Sofia, Bulgaria The 33 rd European Peptide Symposium will provide a great opportunity to exchange ideas and to create new collaborations between successful scientists working in the field of Chemistry, Biology and Pharmaceutical industry related to Peptide Science. The event will offer a varied scientific program, including young scientists’ mini symposium, poster sessions, industrial exhibitions and attractive social program.

GABA is a neurotransmitter in the central nervous system of mammals and its deficiency is associated with severe neurological disorders. Statine, a GABA analogue, occurs in several peptide APIs. Derivatives of gamma-amino acid analogues are of continued vital interest for a variety of applications in medicinal chemistry. We have a tool box available to offer a broad range of substituted gamma-amino acids and statines on custom synthesis basis.

Used for Efficient and Economic Bulk Synthesis of Peptide APIs: A new technology is available with a set of new preloaded resins, which enable the synthesis of peptide amides WITHOUT ANY LINKER. Amino acid amides, which bear a functional side chain, are immobilized on acid sensitive resins. This makes process development, small scale synthesis, bulk production and in-process control very easy. Find more technical details in our application for demonstration purposes with BIVALIRUDIN.

Benzotriazol activated carboxylic acids: Fast reaction (within minutes) at room temperature with amines and other nucleophiles under addition of base (in both water and non- aqueous solvents). Stable to racemization when coupling with nucleophiles. High solubility in organic solvents like DMF and DCM. Stable in water.

May 13th, 2014 Universiteit Utrecht Netherlands The annual Dutch Peptide Symposium provides a unique opportunity for academic and industrial researchers working in the fields of peptide-, protein-, and amino acid chemistry to meet and exchange ideas, insights, and expertise. The 2014 edition of the Dutch Peptide Symposium will be held in Utrecht on May 13.

Bis Thiol & Amine reactive PEGylated Cross-Linker which has been used for enhanced receptor binding, for the design of long-acting conjugates for type 2 diabetes therapeutics and in reorienting the Fab Domains of Trastuzumab Results in Potent HER2 Activators.

Phthalimidooxy PEG-based cross linkers form stable oximes with aldehydes, also latent ones as present in carbohydrates. Their reactivity is sufficiently mild for a broad used in creating conjugates with sensitive biologics.

Compounds like putrescine, spermidine, and spermine play important roles in a many biological functions. Many of them are excellent targets for oncology studies and other fields of medicinal chemistry. Find in our new brochure Diamines & Polyamines our possibilities for custom synthesis and a set over 100 available derivatives.

Any amino acid can be functionalized on the N-terminus with oxalic acid and on the C-terminus with hydrazine, in order to form a so-called NXO building block. Through this double modification N and C terminus will be inverted, which provides interesting structural options for peptidomimetics.

Aryl azides are well-known precursors of nitrenes and have been introduced by Fleet  et al . as versatile photoaffinity labeling agents to probe biological receptors.

The azido function can be used for different applications

Building Blocks for the synthesis of 2,3-diaminobutanoic acid containing peptides or for Click reactions.

September 2nd - 7th, 2012 Athens, Greece Megaron Conference Centre   With more than 550 submitted abstracts and more than 500 already registered participants coming from more than 40 different countries, the 32nd European Peptide Symposium assures an exciting scientific program.

Our portfolio currently contains over 5500 products. Many of them – in particular standard consumables for peptide synthesis – are being produced in bulk quantities.  Therefore we can keep our prices also for lab quantities at very competitive level. In case of need for bulk quantities please inquire: - All 20 Proteinogenic  Fmoc-protected Amino Acids  are available in 100+ kg Lots;

alpha-Sulfo-beta-Alanine has been used to couple to hydrophobic labels like Cyanine and Rhodamine dyes and other hydrophobic residues to increase their solubility in water. As di- or tripeptide a further increase of hydrophilicity can be achieved. Fmoc-beta-Ala(SO3H)-OH can be coupled in SPPS by standard phosphonium or uronium based coupling reagents. In high throughput technologies for DNA sequencing and genomics charge-modified dye-labeled dideoxynucleoside-5’-triphosphates were synthesized for &ls...

H-L-Aha-OH*HCl H-L-Dab(N3)-OH 4-Azido-L-homoalanine (S)-2-Amino-4-azidobutanoic acid hydrochloride Formula:                    C 4 H 8 N 4 O 2 *HCl Molecular Weight:     144,13*35,45 g/mole CAS:  942518-29-8 CODE:  HAA5730 1g:       EUR    200,-    US$    300,-  5g:   ...

Reported applications: Introduction of 9-fluorenylmethyloxycarbonyl, trichloroethoxycarbonyl, and benzyloxycarbonyl amine protecting groups into O-unprotected hydroxylamino acids using succinimidyl carbonates; Anelka Paquet; Can. J. Chem. ; 1982; 60: 976. Widely Applicable Deprotection Method of 2,2,2-Trichloroethoxycarbonyl (Troc) Group Using Tetrabutylammonium Fluoride; Cheng-yuan Huanga; Ning Wanga; Katsumasa Fujikia; Yuji Otsukaa; Masao Akamatsua; Yukari Fujimotoa; Koichi Fukasea; Journal o...

PGA (Penicillin G Amidase, Penicillin Acylase, Penicillin Amidohydrolase from E.coli on acrylic resin, Systematic name: Penicillin amidohydrolase, E.C. 3.5.1.11) has an active pocket, which is very specific for phenyl acetic acid. The prominent commercial use is hydrolysis of a phenylacetamid bond during production of the penicillin API 6-APA (De Martin et al., J. Mol. Catal. B:Enzymatic 1999; 6: 437). The high specifity of PGA towards the Phenylacetyl moiety makes the use of Phacm as new alternative ...

A novel, ethylene glycol-based protecting group is designed and synthesized for use in solid phase peptide synthesis.

Abstract: A considerable number of biologically active naturally occurring products are peptides, depsipeptides, and peptide conjugates.

Chiara Carboni, Hans G. T. Kierkels, Lucia Gardossi, Kamil Tamiola, Dick B. Janssen and Peter J. L. M. Quaedflieg Tetrahedron Asymmetry: 2006; 17 : 245–251 https://doi.org/10.1016/j.tetasy.2005.12.023     Abstract: We have demonstrated for the first time that D-glutamine (D-Gln) and D-glutamic acid (D-Glu) can be efficiently obtained in high ee (97% and 90%, respectively) by enzymatic kinetic resolution of D,L-Gln and D,L-Glu. This was achieved by enantioselective conversion of...