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Bio-Synthesis provides a full spectrum of high quality, custom bioconjugation reagent systems as well as custom synthesis and functionalized biomolecules ready to be cross-linked. These biomolecules can be modified and linked to one or several biomolecules via homobifunctional or heterobifunctional cross-linking chemistries. Whether the conjugate is a drug (small molecule cancer drugs, plant protein toxins), chelating agent, or an adjuvant such as aluminum hydroxide-antibody conjugate or other compounds, Bio-Synthesis has the ability to develop and perform them at GMP compliant manufacturing scales. Our expertise and experience in medicinal and bioconjugation chemistries has assisted our clients from project scope collection to design of appropriate conjugation schemes. We have delivered thousands of custom conjugated biopolymers. We are fully capable of meeting the ever-increasing bioconjugation needs of our clients by aggressively seeking to develop new methodologies that assist our clients to develop new bioconjugate reagents for their biological and drug discovery research.
To obtain further information regarding custom bioconjugation, contact our National Customer Services Center at 800.227.0627 or contact us online with each inquiry to assist in meeting customer specifications.
Price varies based on the project specifications. List price is for reference only. Our service includes materials and labor for conjugation only!
Price does not include the cost of biopolymer synthesis and, if deemed necessary, biopolymer modification to introduce additional functional groups, extra
linkers, and/or spacers. Please contact us for a quote.
Typical conjugation reactions adapted in our laboratory are amide bond formation through preactivated carboxylate, such as NHS ester or carbodiimide DCC with amine; thioether formation through maleimide/alkyl halide with sulfhydryl; hydrazone/oxime formation through ketone/aldehyde and hydrazine/aminoxy, and reductive amination to conjugate aldehydes and amines. Other less common bioconjugation reactions with highly chemoselective nature, such as, cycloadditional reaction, click chemistry (Cu(I)-promoted azide-alkyne [3+2] cycloaddition), the Diels–Alder reaction, and photochemical reactions involving azides, diazirine erivatives, psoralen compound.
Some commonly used cross-linking reagents include:
After standard desalting or purification, a small percent of heterogeneous products containing single or multi-site conjugate per molecule may exist.
All custom synthesis of biomolecules, modification, or bioconjugation services are manufactured under strict quality control processes.
Analytical HPLC and MS analyses are performed in every development cycle. Final target conjugates must first be isolated from excess or unreacted reagent. In many cases,
simple dialysis may suffice to remove unreacted reagent from the reaction solution. Depending on the project scope, size-exclusion chromatography (SEC) or HPLC may also
be used to either remove excess reagent or to isolate and characterize the cross-linked product. The Cross-linked target molecule may then be further characterized by
biochemical or biophysical techniques. Once the product has been purified, it may be subject to various characterization methods including spectrometric (MALDI-TOF, ESI,
LC-MS), fluorescence, electrophoresis, and immunochemical, biochemical, and enzymatic analysis. QC (quality control) and QA (quality assurance) procedures are also
followed independently to ensure the highest quality possible of every delivered conjugate. Moreover, our dedicated technical account managers will guide your project
through every step of the process and keep you informed of the latest progress.
The typical delivery consists of lyophilized sample in individual fully labeled vials. The shipment also contains COA, MS, HPLC, and/or other analytical data. Additional analytical data is also available upon request.
Small molecule labeling generally refers to any form of cross-linking or modification whose purpose is to attach a chemical group (e.g. fluorescent and chemi-luminescent compound, redox labels, biotin, haptens, nanoparticles or user supplied compound having target functional group). The chemical groups can be conjugated with target molecules such as proteins, nucleic acids, and other biomolecules through single, bifunctional or heterofunctional cross linkers to aid in detection.
Choosing the correct cross-linking chemistry sometimes appears overwhelming as it requires a careful understanding of target molecule structure and reactivity. These cross-linking and modifying agents can be applied to alter the native state and function of peptides and protein, sugars and polysaccharides, nucleic acids and oligonucleotides, lipids, and almost any other imaginable molecule that can be chemically derivatized. Therefore, each conjugation project assigned to Bio-Synthesis is carefully designed.
Bio-Synthesis not only offers synthesis of small molecule and biopolymers, but also assists in the functionalization or activation of compounds ready to cross link with pre-activated small molecules either supplied by customers or prepared in-house. These pre-activated small molecules can be created with an amine, acid, hydrazine, aldehyde/ketone, hydroxylamine, maleimide/alkylhalide, and sulfhydryl functional group in a polymer. After labeling of biopolymer with small molecules, a standard desalting, purification, quality check and final concentration and labeling ratio are determined.
Non-commercial small molecule supplied by customer
User-supplied, non-commercial small or macromolecule should be sufficiently pure (≥95% pure). Please provide the QC data (typically HPLC, MS, ESI or NMR data etc.) and MSDS (if any) along with your compound. We can assist with the purification and acquisition of analytical data. These compounds must contain functional groups that can be targeted for cross-linking including carboxylate groups, primary amine groups, aldehyde/ketone residues, hydroxyl, hydrazine, hydrazide, aminoxy, saccharide /glycan groups or thiol reactive functional group(s). Coupling can also be non-selective using a photoreactive phenyl azide cross inker. If necessary, we can also assist with the creation and activation of specific functionalities. Any sample supplied by the client requires a quality check by our analytical team prior to conjugation.
Commercially available small molecules
Commercially available small molecules can be supplied by customers or ordered through Bio-Synthesis. Common small molecules such as common fluorescent dyes, biotin-NHS, and other hetero-bifunctional cross-linkers are available at Bio-Synthesis. For in-stock compounds, Bio-Synthesis will charge customers only the amount needed for conjugation. If the small molecules are to be purchased separately, the cost of acquiring this material will be added to the invoice along with a $50 administration charge per order.
Non-commercially available small molecules
We can custom synthesize small molecules either in house. A quotation will be prepared for such syntheses.
Oligonucleotide, oligomimetics, and custom gene or genomic DNA
Oligos or custom genes such as DNA or RNA can be synthesized in-house at Bio-Synthesis and conjugated through amino, thiol, or 5'-phosphate modification. Oligos supplied by the customer should be HPLC or gel purified (>90% pure). Please provide the QC data needed for purity assessment. Extra charges may apply for analyzing the starting materials at Bio-Synthesis.
Peptides, peptidomimetics, and expressed protein
Peptides and proteins can be synthesized or expressed in-house at Bio-Synthesis. We label or conjugate peptides through N-terminal, C-terminal or internal side chain of an amino acids. Peptides supplied by the customer should be HPLC purified (>90% pure) and should contain a single modification site. We can make any standard peptide with functional groups incorporated through peptide synthesis. Please provide the peptide sequence of the desired peptide on the order form.
Commercial antibodies can be supplied by customers or ordered through Bio-Synthesis with an additional fee plus the cost of the antibody. Non-commercial biopolymers supplied by customers should be affinity purified. Please provide gel electrophoresis data along with your antibody. Bio-Synthesis also assists customer with antibody production, purification, modification, and fragmentation prior to any cross linking reaction
We offer post-synthetic modification of ligands to be immobilized on various solid supports, which allow the immobilization process to occur selectively in the presence of common functional groups, including amines, thiols, carboxylic acids, and alcohols. Bio-Synthesis offer functional group modification and derivatization;
See more information on Biomolecule Modification
Every chemical modification or conjugation process involves the reaction of one functional group with another, resulting in the formation of a covalent bond. The creation of bioconjugate reagents with spontaneously reactive, or selectively reactive functional groups, forms the basis for simple and reproducible cross-linking or tagging of target molecules. Our well-trained chemists assist clients from starting project scope collections to design, and determine appropriate homobiofunctional or heterobifunctional cross-linking chemistries. We have delivered thousands of custom conjugated biopolymers and are fully capable of meeting the ever-increasing bioconjugation needs in biological and drug discovery research. Hundreds of reaction systems have been applied in our organic laboratories.
Custom synthesized biopolymers such as peptides and oligonucleotides from Bio-Synthesis are manufactured under strict high level quality control processes. We use the efficient method of mass spectrometry (MS) for all single custom peptides, oligonucleotides, and for purified biopolymers. We also analyze by RP-HPLC and other quality check methods available upon request.
Bio-Synthesis is committed to Total Quality Management (TQM) to assure complete satisfaction. MS and HPLC analyses are performed following the completion of biopolymer synthesis, purification and QC (quality control). QA (quality assurance) procedures are also followed independently to double guarantee the quality of every delivered peptide. Bio-Synthesis's Total Quality Management System (TQM) has been successfully upgraded to fully comply with ISO 9001:2008 regulations.
Project: DNA-Peptide Conjugation
Visit our literature vaults for more references and citings.
For us to better understand your customized project, please complete our Bioconjugation Service Questionnaire. The more our chemists understand your project needs, the more accurate feedback we will be able to provide you. Provide us with your project details will enable to us to recommend the best reagents to use for your project. The most useful and readily available tools for bioconjugation projects are cross-linking reagents. A large number of cross-linkers, also known as bifunctional reagents, have been developed. There are several ways to classify the cross-linkers, such as the type of reactive group, hydrophobicity or hydrophilicity, and the length of the spacer between reactive groups. Other factors to consider are whether the two reactive groups are the same or different (for example, heterobifunctional or homobifunctional reagents), whether the spacer is cleavable, and whether the reagents are membrane permeable or impermeable. The most accessible and abundant reactive groups in proteins are the ϵ-amino groups of lysine. Therefore, a large number of the most common cross-linkers are amino selective reagents, such as imidoesters, , sulfo-N-hydroxysuccinimide esters, and N-hydroxysuccinimide esters. Due to the high reactivity of the thiol group with N-ethylmaleimide, iodoacetate and a-halocarbonyl compounds, new cross-linkers have been developed that contain maleimide and a-carbonyl moieties. Usually, N-alkylmaleimides aremore stable than their N-aryl counterparts.
In addition to the reactive groups on the cross-linkers, a wide variety of connectors and spacer arms have also been developed. The nature and length of the spacer arm play an important role in the functionality. Longer spacer arms are generally more effective when coupling large proteins or those with sterically protected reactive side-chains. Other important considerations are the hydrophobicity, hydrophilicity, and the conformational flexibility. Long aliphatic chains generally fold on themselves when in an aqueous environment, which makes the actual distance spanned by such linker arms less than expected. Instead, spacers that contain more rigid structures (for example, aromatic groups or cycloalkanes) should be used. These structures, however, tend to be very hydrophobic which could significantly decrease the solubility of the modified molecules or even modify some of their properties. In such cases, it is recommended to choose a spacer that contains an alkylether (PEO) chain. Bio-Synthesis offers several cross-linkers with PEO chains, such as thiol-binding homobifunctional reagents, heterobifunctional based, and their derivatives.
Within 3-5 days upon receiving your project scope, we will provide you an appropriate quotation. An order can be placed with PO (Purchase Order) or major credit cards ( ). Your credit card will be billed under Bio-Synthesis, Inc.