Search results for: 'that'

Game Changer for Protein Modification: Discover oxidation-induced furan crosslinking and 5-hydroxy-1,5-dihydro-2H-pyrrol-2-ones ( 5HP2O s) as stable alternative to maleimides.

Discover CysGluDan, a new fluorescent probe for the detection of reactive metabolites in drug development, which can detect both "soft" and "hard" nucleophiles. 

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?

Green – Yellow – Red – Grey. To increase transparency in terms of expected shipping times, we have introduced a color code in our webshop indicating product and packing unit availabilities.

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

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! 

Novel excipients can help you master the challenges associated with the production and formulation of protein- and RNA-based drugs due to their inherent fragility. Discover the SURPAX TM technology!

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.

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!

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!

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. 

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!

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.

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!

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.

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!

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.

A heart of gold! Metals and ores - see here how their surfaces can be equipped with bifunctional organic linker molecules and thus be turned into modifiable biocompatible materials.

You missed our workshop featuring Dr. Stefan Kubick (B4Pharmatech, Berlin)? Any further questions? Please get in contact via info@iris-biotech.de  

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.

You want to attach your small molecule to a certain carrier? Let’s analyze the functional groups present and discuss Linkerology® possibilities for permanent or trigger-inducible, tracelessly-cleavable linkage.

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).

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!

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!

You missed our workshop featuring Prof. Rob Liskamp (Cristal Therapeutics, University of Maastricht, University of Glasgow)? Any further questions? Please get in contact via info@iris-biotech.de.

Our building block Fmoc-L-Cys(Cam)-OH enables peptides resembling reduced and carbamido-methylated protein fragments by standard SPPS without error-prone modification reactions.

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!

Infinite like the deep sea – marine 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.

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.

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!

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.

Herein, we present CliCr® as an innovative cyclic alkyne for metal-free strain-promoted click chemistry. Read our blog for detailed information about CliCr® reagents based on TMTHSI and check out available derivatives!

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!

You missed our workshop featuring Prof. Knud J. Jensen (Professor, Head of Group; University of Copenhagen)? Any further questions? Please get in contact via info@iris-biotech.de.

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.

Linkers serve as versatile tools, e.g. during SPPS or for the sophisticated (self-immolative) conjugation of a potent small molecule to a carrier. Check out our selection of over 100 readily available linkers.

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!

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.

1,4-Benzenedimethanethiol is used as thiol scavenger during solid-phase peptide synthesis. In comparison to other thiol scavengers, this reagent is odorless and provides high quality crude peptides.

No matter how much you hate them, in the pharmaceutical world you have to deal with them: Impurities. Iris Biotech can provide you with the molecules you require. Click here for more detailed information.

Read on for detailed information on the results of our comparative study on different methods to tackle aspartimide formation. Click here!

As the molecular diversity of cyclic and branched peptides becomes more and more challenging, a high level of orthogonal dimensionality is required. Herein, we present a new category of orthogonal protecting groups.

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.

You just started working in the field of solid phase (peptide) synthesis and want to get familiar with resins? Click here to get an overview about the different parameters describing resins.

We are highly excited to see the research that our products are used for. Send your peer-reviewed scientific publication to publication@iris-biotech.de for citation – we will reward you.

Herein, we present 2-Iminobiotin, a cyclic guanidino analogue of biotin with pH-dependent affinity for avidin, and compare it to biotin and desthiobiotin. Click here for more detailed information.

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!

Are you active in the field of antibody drug conjugates? Click here to find out more about our selection of as well as the technology behind pH-sensitive self-immolative linkers.

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.

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!

Drug the undruggable – click here to get more information about the use of PROteolysis TArgeting Chimeras (PROTACs®) as a tool for targeted protein degradation and discover available building blocks.

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.

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!

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.

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 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.

You missed our workshop featuring Prof. Dr. Jeffrey W. Bode (ETH Zurich)? Any further questions? Please get in contact via info@iris-biotech.de

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.

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.

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.

With the approval of several COVID-19 vaccines and drugs in recent months, hope is growing that the current pandemic will end soon.

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

Read on to find out more about Iris Biotech’s Linkerology® portfolio including substituted pyridyldithiols as building blocks for the reversible chemical conjugation to sulfhydryls.

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.

Fmoc-Asp(CSY)-OH – an innovative building block to suppress aspartimide formation during peptide synthesis by utilizing cyanosulfurylide as carboxylic acid protecting group. Read on to find our more!

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.

Frustrated by aspartimide formation during peptide synthesis? Iris Biotech presents aspartate derivatives with bulky side chain protecting groups that minimize the formation of aspartimide-related side-products.

The new disulfide-based protecting group sec-isoamyl mercaptan (SIT) is fully compatible with Fmoc- and Boc-SPPS and can easily be removed reductively upon addition of dithiothreitol.

Cyclopropanes represent important design elements in medicinal chemistry and are widely present in drug compounds. Read on to find out more about their full potential.

March 4, 2021

The linkage of a drug to its carrier via a disulfide-based self-immolative linker allows for the specific intracellular release of the active molecule upon glutathione reduction and linker cleavage.

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.

The thiosuccinimide linkage is a prominent connective motif resulting from the reaction of a thiol and an alkyl maleimide. Read on to learn more about its applications and potential improvements.

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 offers various linked kinase inhibitors including analogues of Gefitinib, Imatinib, Sunitinib, Staurosporine and many more, which can easily be conjugated to other biomolecules, if desired. Have a look and read more.

Nitrodibenzofuran (NDBF) is a photocleavable side chain protecting group that can be removed by photolysis upon irradiation with UV-light or – especially for in vivo applications – by two-photon excitation using near infrared light.

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.

Isopropyl-β-D-thiogalactopyranoside (IPTG) is one of the most commonly utilized reagents in molecular biology.

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.

We, Iris Biotech GmbH, are pleased that Dr. Thomas Bruckdorfer completes the BIOPARK8-Brain-Network in Regensburg and will enrich it with our experience.

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.

The ever-growing sophistication and variation in linker design have given rise to a new and distinct field of knowledge in synthetic chemistry termed Linkerology. Discover our expertise and panoply of new cutting-edge tailor-made linker constructs for the latest state-of-the-art bioconjugations.

The integrin receptor interacting RGD sequence and related peptides act as promising tools for drug therapy and cancer research. Find more information on our portfolio of cyclic RGD peptides.

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.

Beginning of March 2020 Iris Biotech implemented measures in order to minimize the impact of and the risks associated with the current pandemic. As of 26 March 2020, Iris Biotech is classified as system-relevant .

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.

19 - 23 January 2020

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

Biotinylation of proteins and their purification via Streptavidin beads is a widely applied method.

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.

22 November 2019

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

8 - 12 September 2019

5 - 7 September 2019

3 - 6 June 2019

12 - 16 May 2019

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

Methods for proteomic mapping of cellular organelles or subdomains that avoid the necessity of cell lysis and purification by targeting specific subcellular regions have several advantages.

3 - 7 December 2018

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.

Find below derivatives of arginine and lysine bearing side chains as found in Maillard reaction products.

The 2D monolayer cell culture model is widely applied for drug screening. However, this approach is frequently not able to adequately mimic the in vivo response.

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

We are proud to announce the relocation of our company to a brand new office and warehouse complex on May 17th.

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

5-7 February 2018

Of course, Iris Biotech is aiming to deliver your products as fast as possible. The following table provides an overview of general delivery times for products which are on stock and are not counted as dangerous goods. Stock Items Delivery Destination Germany Europe Worldwide Delivery Time 1 Day 1-2 Days Around 2-5 Days Although smaller quantities of dangerous goods can often be delivered just as fast as substances that are not declare...

This alkyne-functionalized cysteine building block can be incorporated into peptides via the Fmoc strategy.

One role of proline in proteins is that a β-turn of a peptide chain is being induced at its position. Two major conformations, cis or trans, of the corresponding amid bond will induce that the protein folds in a specific way.

The Fmoc group is the most frequently used protecting group in peptide chemistry. The most common deprotection conditions involve a solution of 20% piperidine in DMF.

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.

5 - 7 July 2017

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

a) Catalyst-free Click Reaction Cycloaddition reactions such as the [3+2] azide-alkyne and the [4+2] Diels-Alder reaction, are becoming common conjugation techniques. Applications range from imaging, drug design and development of sensors, thereby spanning the fields of chemical biology, material science, surface and polymer chemistry as well as many other fields. Introduced in 2002, the copper-catalyzed variant of the azide-alkyne cycloaddition (CuAAC) reaction has found broad applicability in t...

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.

Click Chemistry in DNA Synthesis - Applications and Procedures in DNA Synthesis

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).

Polyamines such as ethylene diamine and its higher homologues are important feedstocks for the chemical industry. Compounds like putrescine, spermidine, and spermine play important roles in both eukaryotic and prokaryotic cells and show many other different biological functions.

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.

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.

Paolo Braiuca, Knapic Lorena, Valerio Ferrario, Cynthia Ebert, and Lucia Gardossi Adv. Synth. Catal. 2009; 351 : 1293–1302 https://doi.org/10.1002/adsc.200900009   Abstract: Computational techniques involving molecular modeling coupled with multivariate statistical analysis were used to evaluate and predict quantitatively the enantioselectivity of lipase B from Candida antarctica (CALB). In order to allow the mathematical and statistical processing of the experimental data largely ava...

Conjugates of PEG and folic acid or cholesterol, respectively, combine the positive properties of these molecules. Those conjugates are available with a wide variety of functional groups and different PEG chain lengths to suit your needs.

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!

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.

The reaction between a tetrazine (Tz) and a trans -cyclooctene (TCO) is the innovative third generation Click reaction that proceeds without the use of copper or other catalyst. It is rapid, fully bioorthogonal and excels at very low concentrations.

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.

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.

Our new Biotin-SS-Tyramide linker is a valuable tool for peroxidase-promoted targeted protein biotinylation. By using peroxidase-tagged antibodies, proteins and protein clusters can be selectively biotinylated, and then isolated using streptavidin. The biotin tag can be subsequently removed using reducing agents (e.g. glutathione).

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.

October 22 to 25, 2015 Ramada Couran Cove Island Resort, South Stradbroke Island, Queensland, Australia http://solidphase.org The symposium provides a superb opportunity for all practitioners of solid phase peptide synthesis together with those who use synthetic peptides for a myriad of applications to congregate at the beautiful Couran Cove Resort, South Stradbroke Island, a short ferry ride from the famed Gold Coast of Queensland .

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 new hydrazone resin enables a convenient way to synthesize peptide hydrazides for Hydrazone Ligation Technique and Native Chemical Ligation (NCL).

August, 6th - 7th, 2015 Molecular Foundry, Lawrence Berkeley National Laboratory Berkeley, CA, USA The Peptoid Summit is a friendly gathering of students, post-docs, and PI’s investigating new directions in bio-inspired polymer research.  Peptoids are a highly designable polymer system, allowing unprecedented control over the their exact chemical structure.  This is leading to advances in a wide range of fields, from biomedicine to materials science.  Our community is growin...

Alkylating the Nitrogen of an amide bond results in peptoid structures, leading to conformational restrains, like N-methylation and allows backbone derivatisation. Applications already have been published with Cilengitide, Piscidin 1, and MC4 receptor agonist.

We at Iris Biotech, are pleased to announce that we have entered into an agreement with Peptide Solutions, LLC to sell the complete line of our products in the USA and Canada. Peptide Solutions’ website has a link to our complete list of products so ordering online is extremely easy, however, personal contact is available at the phone listed above, Monday through Friday, 8am to 5pm MST.

June 8th - 11th, 2015 University of Lorraine, Campus du Saulcy Metz, France The Bioheterocycles 2015 - XVI International Conference on Heterocycles in Bioorganic Chemistry is a continuation of the series started by Professor Henk van der Plas in 1980. Since that time the boundaries of bio-organic chemistry have been expanded significantly and we feel it is time to learn about the latest progress in the field. The objective is to facilitate fruitful interaction of young scientists with internat...

March 9th-11th, 2015 Porte de Versailles, Conference Center Expo Paris, France As the springtime counterpart to BIO-Europe, BIO-Europe Spring ® continues the tradition of providing life science companies with high caliber partnering opportunities. Featuring EBD Group’s acclaimed partnering system, partneringONE ® , the event enables delegates to efficiently identify, meet and get partnerships started with companies across the biotech value chain. In addition to productive part...

Cleavable dipeptide linkers like Val-Ala and Val-Cit rely on processes inside the cell to liberate the payload, as they undergo rapid hydrolysis in the presence of lysosomal extracts or purified human cathepsin B.

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

The presence of catalytic copper, limits the in vivo application of the Click this reaction for several reasons. We offer custom synthesis of Strained Cyclooctynes and Substituted 1,2,4,5- Tetrazines as building blocks for fast Click reactions in the absence of any catalyst.

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.

June 12th - 14th, 2014 Centro Congressi of University of Naples "Frederico II" Napoli, Italy The Workshop, designed to provide updated information and to critically discuss current trends on synthetic and conformational aspects of bioactive peptides, will deal in the 14th edition with the general subject: "The Renaissance era of Pepitdes in Drug Discovery" .

May 19th - 21th, 2014 Centro de Investigación Príncipe Felipe Valencia, Spain Unlike other Drug Delivery Symposia that have a broader remit, this unique conference series was specifically established to provide a forum for interdisciplinary exchange of state-of-the-art techniques and advances in knowledge relating to the design, clinical development and commercialisation of Polymer Therapeutics. The key topics discussed during the 10th International Symposium on Polymer Therapeutics are...

Cysteins and homocysteins are found in many natural and artificial peptide sequences. Mercaptoproline is a rigid analogue of homocysteine offering several options to the medicinal chemist.

Tyramine compounds are converted to highly reactive radicals by horseradish peroxidase in presence of H2O2 which preferentially react with surface exposed tyrosines. Biotin Tyramide and Biotin-PEG-Tyramide therefore are ideal reagents used for tyrosine-/protein-biotinylation.

March 27th - 29th, 2014 Mosbach/Baden Germany The spring meetings of the German Society for Biochemistry and Molecular Biology (GBM) are held annually in the picturesque town of Mosbach to promote the exchange of scientific ideas and education of young scientists. The scientific theme of the 65th meeting is “Molecular quality control of proteins in health and disease”.

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.

April 22-25, 2013 McCormick Place, Chicago, Illinois Iris Biotech GmbH will participate at the international Bio Convention 2013 in Chicago, USA. We would be glad to meet you.

June 22nd– 27th, 2013 Hilton Waikoloa Village Hawai‘i, USA The Symposium will follow its long standing tradition of featuring talks by leading scientists from the academic and industry communities sharing current and compelling peptide research.

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.

Dess-Martin-Periodinane is one of the most useful reagents for the reduction of primary and secondary alcohols to aldehydes and ketones.

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.

A prominent luciferase group was first discovered in Coelenterata and the corresponding light emitting molecule was therefore named coelenterazine.

The overall goal of our research is to capitalize on peptides of natural origin and their biological activity and chemistry.

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.

June 18th-21st, 2012 Boston, USA Iris Biotech GmbH will participate at the international Bio Convention 2012 in Boston, USA. We would be glad to meet you at our booth number 0828.  

February 9th - 10th, 2012 Brussels, Belgium Since many years, the Belgian academic and industrial groups that are active in various aspects of peptide research did not have an opportunity to get to know each other and to discuss common interests.

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:   ...

Cleland's reagent, also known as dithiothreitol or DTT is a water soluble protective reagent for sulfhydryl groups. It reduces disulfide linkages to free sulfhydryl groups in proteins and enzymes. It is a component of buffers used in protocols for the isolation and purification of proteins. DTT (racemic), Cleland's Reagent

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 ...

Dendrimers offer a new possibility to derivatize small molecules, surfaces or biopharmaceuticals with a monodisperse macromolecule and alter in this way properties like solubility and hydrophilicity. Immunogenicity and pharmacokinetics of pharmaceuticals will be improved. The synthetic approach for designing these dendrons of different generations is based on 2,2-bis(hydroxymethyl) propionic acid, which is a non-toxic and biocompatible building block. The size can be designed from 250 g/mole for 1st gene...

Abstract: Trypsin digests peptides at the position of arginine. Because shorter homologues of arginine with appropriate protecting groups for conventional Fmoc/tBu peptide synthesis are now available, three model peptides containing arginine and two shorter homologues of arginine were synthesized.

Abstract: In 2006 the market of modern biopharmaceuticals has reached a volume of over 3 billion in USA and over billion world wide (IMS Health, Inc.).

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...

Peptides are key to modern drug discovery. This article reviews the requirements for bulk production of peptides and how it affects research and production of smaller scales.