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Glycoconjugation Services

Glycoconjugation for targeted delivery and biological recognition.

Glycoconjugation services for drugs, antibodies, oligonucleotides, peptides, and proteins using carbohydrate and polysaccharide scaffolds for targeted delivery and biological recognition.

Glycoconjugate & Vaccine Support Carbohydrate & Polysaccharide Carriers GalNAc & Oligonucleotide Conjugation End-to-End Bioconjugation Texas, USA
Speak to a Scientist Overview Carbohydrate & Polysaccharide Types
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Overview Carbohydrates & Polysaccharides Bioconjugate Design & Applications Conjugation Chemistries Recommended Reading Speak to a Scientist

Carbohydrate and polysaccharide bioconjugation schematic, Bio-Synthesis overview Overview

Glycoconjugation services at Bio-Synthesis enable the design of carbohydrate-based bioconjugates for improved targeting, stability, solubility, and biological recognition across therapeutic and diagnostic applications.

  • Targeted delivery (e.g., GalNAc–hepatocyte targeting)
  • Improved solubility and stability
  • Enhanced biological recognition
  • Multivalent binding for increased efficacy

Glycoconjugation involves attaching carbohydrates (glycans), including mono-, oligo-, and polysaccharides, to biomolecules such as drugs, proteins, antibodies, peptides, and oligonucleotides. These scaffolds provide hydrophilicity, multivalency, and receptor-specific interactions that are not easily achieved with small molecules or synthetic polymers.

Typical systems include GalNAc–oligonucleotide conjugates for liver targeting, mannose-functionalized constructs for immune modulation, and polysaccharide carriers such as dextran, hyaluronic acid, and chitosan for multivalent delivery and controlled release.

Bio-Synthesis supports a broad range of glycoconjugate formats, including polysaccharide–protein conjugates, carbohydrate–oligonucleotide systems, glycopolymers, and surface-immobilized glycans, with optimization of scaffold selection, conjugation chemistry, and degree of substitution.

Carbohydrate / Polysaccharide Carrier
Dextran · HA · Chitosan · Pullulan · Cellulose
Conjugation Chemistry
Reductive Amination · EDC/NHS · Click · Thiol
Payload
Drug · Oligonucleotide · Protein · Peptide · Dye

Targeted Delivery

GalNAc, mannose and other ligands enable receptor-mediated delivery, while polysaccharide carriers support multivalent presentation of drugs, peptides and oligonucleotides.

Immobilization & Assays

Dextran, cellulose and chitosan-based systems support surface immobilization, biosensor coatings and glycan arrays with controlled ligand density.

Stability & Solubility

Hydrophilic carbohydrate scaffolds improve solubility, reduce nonspecific binding, and enhance stability in delivery and diagnostic systems.

Glycoconjugation can be integrated with bioconjugation services, polymer bioconjugation, lipid bioconjugation and oligonucleotide bioconjugation

Carbohydrate and Polysaccharide Types Used in Glycoconjugation at Bio-Synthesis

Monosaccharides & Oligosaccharides

  • Glucose / Glucosamine — metabolic tags, hydrophilic modifiers and general glyco-labels.
  • Galactose / GalNAc — ligands for hepatocyte targeting via the asialoglycoprotein receptor (ASGPR).
  • Mannose / Mannan Fragments — ligands for mannose receptors on dendritic cells and macrophages.
  • Fucose — components of Lewis antigens and glycan motifs for cell-recognition studies.
  • Sialic Acids (e.g., Neu5Ac) — terminal residues for stealthing, trafficking and recognition.

Polysaccharide Scaffolds

  • Dextran & Derivatives — neutral, flexible carriers for multivalent drug, dye and ligand loading.
  • Hyaluronic Acid (HA) — CD44-binding polymer for tumor and stem-cell targeting and hydrogel matrices.
  • Chitosan & Chitosan Derivatives — cationic polysaccharide for nucleic acid delivery and mucoadhesive systems.
  • Pullulan — highly soluble carrier for imaging probes, drug conjugates and nanoparticles.
  • Cellulose Derivatives & Heparin — structural scaffolds, affinity matrices and controlled-release components.

Biological Target & Function

  • Use GalNAc clusters for hepatocyte targeting via ASGPR in siRNA/ASO delivery.
  • Select mannose/mannan for antigen-presenting cell and vaccine applications.
  • Choose HA when CD44 expression and tumor or stromal targeting are desired.

Formulation & Process Behavior

  • Balance charge (cationic chitosan vs neutral dextran) to control aggregation and payload binding.
  • Consider solubility, viscosity and degree of substitution (DoS) for scale-up and filtration.
  • Match polymer MW and branching to the intended route of administration and clearance profile.

Commonly Used Carbohydrates & Polysaccharides for Bioconjugation We Offer

The table below summarizes representative carbohydrates and polysaccharides frequently used by Bio-Synthesis and in the broader field for glycoconjugation (carbohydrate-based bioconjugation). Scaffolds are grouped by their primary functional role in the conjugation or formulation strategy.

Carbohydrate / Polysaccharide Class / Role Reactive Group / Feature Typical Use in Bio-Synthesis
Glucose / Glucosamine Derivatives Monosaccharide label / solubility enhancer Hydroxyls; amine (glucosamine) General hydrophilic tagging, metabolic glycan-labeling, and spacer groups for proteins and peptides.
Galactose Monosaccharide ligand Hydroxyls; aldehyde after oxidation Glycan motifs for recognition studies, glycoprotein standards and affinity purification tools.
N-Acetylgalactosamine (GalNAc) Hepatocyte-targeting ligand Hydroxyls; amide; tailored handles Triantennary and clustered GalNAc–siRNA/ASO conjugates, including 5' Tri-GalNAc modified RNA, for liver-targeted nucleic acid delivery.
Mannose Immune-targeting ligand Hydroxyls; aldehyde after oxidation Mannose-decorated proteins, nanoparticles and polymers for APC targeting and vaccine constructs.
Mannan Oligosaccharides Multivalent immune scaffold Multiple sugar residues Higher-valency mannose presentations for enhanced receptor avidity and immune activation.
Fucose & Fucosylated Motifs Cell-recognition motif Hydroxyls; aldehyde after oxidation Glycan standards, selectin-binding ligands and glycoprotein engineering tools.
Sialic Acids (e.g., Neu5Ac) Terminal glycan / stealth motif Carboxylate, hydroxyls Stealth coatings, trafficking motifs and glycan-structure mimetics on proteins and nanoparticles.
Dextran (various MW) Neutral polysaccharide carrier Hydroxyls; aldehydes after oxidation Multivalent drug, dye, protein and antibody conjugation; size-increasing carrier for imaging agents.
Carboxymethyl Dextran Polyanionic polysaccharide Carboxylates, hydroxyls SPR chip surfaces, bead coatings and scaffold for EDC/NHS-mediated protein immobilization.
Hyaluronic Acid (HA) CD44-binding polysaccharide Carboxylates, hydroxyls HA–drug and HA–peptide conjugates for CD44+ tumor/stem cell targeting and HA-based hydrogels.
Chitosan Cationic polysaccharide Primary amines, hydroxyls Chitosan–DNA/RNA complexes, mucoadhesive formulations and nanoparticle-coated glycoconjugates.
Thiolated Chitosan Thiol-functional polysaccharide Thiol and amine groups Thiol–maleimide crosslinking and gelation; covalent immobilization of ligands and enzymes.
Pullulan Neutral, highly soluble polysaccharide Hydroxyls; aldehydes after oxidation Pullulan–drug, –dye and –protein conjugates for imaging, targeting and controlled release.
Cellulose Derivatives (CMC, HEC, HPC) Structural polysaccharide scaffold Hydroxyls; carboxylates (CMC) Hydrogel matrices, surface coatings and affinity supports for protein and ligand immobilization.
Heparin / Heparan Sulfate GAG binding scaffold Sulfates, carboxylates Heparin–protein conjugates and surfaces for growth-factor binding and controlled-release systems.
Azide- or Alkyne-Modified Sugars Click-ready carbohydrate ligands Azide or alkyne handles SPAAC/CuAAC attachment of sugars to proteins, peptides, oligonucleotides and nanoparticles.

Additional specialty carbohydrates and proprietary polysaccharides can be integrated on request, including custom branching, MW ranges, reactive handles (azide, alkyne, thiol, aminooxy) and pre-activated derivatives.

Glycoconjugate Design & Applications

Glycoconjugate design depends on the carbohydrate scaffold, payload type, linker chemistry, degree of substitution, and target biology. Bio-Synthesis supports carbohydrate-based conjugates for targeted delivery, vaccine research, diagnostics, surface immobilization, and oligonucleotide delivery.

Bioconjugate Formats

  • Polysaccharide–protein conjugates for glycoconjugate vaccines and immunoassays.
  • Sugar–peptide and sugar–protein conjugates for glycosylation-mimic designs.
  • Carbohydrate–oligonucleotide conjugates, including GalNAc–siRNA and GalNAc–ASO systems.
  • Polysaccharide–drug conjugates for solubility enhancement, prodrug design, and controlled release.

Design Considerations

  • Carbohydrate type: mono-, oligo-, or polysaccharide scaffold.
  • Target receptor or pathway, such as ASGPR, CD44, or mannose receptors.
  • Linker stability, cleavability, and conjugation site selectivity.
  • Degree of substitution, ligand density, multivalency, and payload spacing.
  • GalNAc–siRNA / GalNAc–ASO conjugates for hepatocyte-targeted oligonucleotide delivery.
  • Dextran–protein and dextran–enzyme conjugates for imaging and assay systems.
  • HA–drug and HA–peptide conjugates for CD44 targeting.
  • Mannose-decorated constructs for immune-cell targeting.
  • Carbohydrate-coated surfaces for assays and biosensors.

Case Study: 5' Tri-GalNAc Modified RNA

5' Tri-GalNAc modified RNA
5' Tri-GalNAc modified RNA example for hepatocyte-targeted delivery.

Conjugation Workflows & Chemistries

Carbohydrate / Polysaccharide Scaffold
Dextran · HA · Chitosan · Pullulan · Mono/Oligosaccharides
Conjugation Chemistry
Reductive Amination · EDC/NHS · Oxime/Hydrazone · Click
Payload
Antibody · Protein · Peptide · Oligo · Drug · Dye

Common Conjugation Strategies

  • Periodate Oxidation & Reductive Amination — oxidation of vicinal diols to aldehydes, followed by Schiff base formation and reduction to stable C–N linkages.
  • EDC/NHS Coupling — activation of carboxyl groups on HA, CMC or heparin for amide bond formation with primary amines.
  • Oxime & Hydrazone Ligation — reaction of aldehyde/ketone-modified carbohydrates with aminooxy or hydrazide-bearing ligands.
  • Thiol–Maleimide & Michael-Type Additions — for thiolated carbohydrates or polysaccharides and maleimide-functional payloads.
  • Azide–Alkyne Click Chemistry (SPAAC/CuAAC) — Cu-free or Cu-catalyzed attachment of azide/alkyne-labeled sugars to complementary ligands.

Workflow Highlights

  • Selection of carbohydrate scaffold, activation route and linker based on payload and application.
  • Control of substitution level, site bias and multivalency for reproducible potency and binding.
  • Purification via chromatography, dialysis, TFF and/or precipitation depending on MW and matrix.
  • QC including composition, degree of substitution, binding activity, size, charge and stability.
Carbohydrate / Polysaccharide
Preferred scaffold (mono-, oligo-, polysaccharide), MW range, source and any existing functionalization.
Payload
Identity (drug, peptide, protein, antibody, oligo, dye), available functional groups and desired conjugation site(s).
Design Goals
Intended application (vaccine, targeting, imaging, coating), required valency, expected stability and route of administration.
QC & Documentation
Required tests (DoS, binding activity, size, residuals), acceptance criteria and documentation needs for internal or OEM use.

Technical Summary — Carbohydrate & Polysaccharide Platform

Workflow

  • Initial design review (scaffold selection, payload, target receptor, immune/readout goals).
  • Conjugation route scouting, including oxidation/reductive amination, EDC/NHS or click strategies.
  • Optimization of degree of substitution, linker chemistry and reaction conditions.
  • Purification and polishing via chromatography, dialysis and/or TFF.
  • QC panel and documentation aligned to research, preclinical or OEM requirements.

Controls & Comparators

  • Unconjugated carbohydrate/polysaccharide and free payload controls.
  • Formulations with varied substitution levels, linker types or carbohydrate scaffolds.
  • Cleavable vs non-cleavable linkers and alternative attachment positions on payloads.
  • Functional benchmarks including receptor binding, cell uptake, potency and stability.

Analytics & Documentation

  • Characterization of degree of substitution, composition, size and charge as applicable.
  • Binding assays (lectin, receptor, antibody), activity assays and stability profiles.
  • Residual reagent/solvent and endotoxin testing where required.
  • Certificates of Analysis and optional method and process descriptions for tech transfer.

FAQ

Can you coat plates, beads or chips with carbohydrates?

Yes. We can immobilize carbohydrates and polysaccharides on plates, beads and chip surfaces using covalent or affinity strategies to generate tools for lectin binding, serology, glycan mapping and other assays.

What information do you need to scope a carbohydrate project?

At minimum, we need your chosen or candidate carbohydrate scaffold, payload description and handles, intended application, target receptor or assay, desired substitution level and any critical performance metrics or constraints.

Do you provide material suitable for diagnostic kits or OEM use?

We support projects requiring enhanced documentation, lot control and stability programs suitable for diagnostic kit or OEM environments and can align release criteria with your internal standards.

Can you prepare GalNAc–siRNA or GalNAc–ASO conjugates?

Yes. We can design and synthesize GalNAc-bearing ligands and conjugate them to siRNA or ASO payloads using suitable linkers and attachment sites, followed by purification and analytical characterization for hepatocyte-targeted delivery.

Do you support polysaccharide–protein conjugates for vaccine research?

Yes. We support polysaccharide–protein conjugates, including carrier-protein coupling, linker selection, degree-of-substitution optimization and QC to enable vaccine and immunology studies.

What is glycoconjugation?

glycoconjugation (carbohydrate-based bioconjugation) refers to attaching mono-, oligo- or polysaccharide scaffolds to drugs, peptides, proteins, antibodies, nanoparticles or oligonucleotides to improve targeting, solubility, immunogenicity, pharmacokinetics and analytical performance.

Which carbohydrate and polysaccharide types can you work with?

We routinely work with glucose/glucosamine, galactose/GalNAc, mannose/mannan, fucose, sialic acids, dextran and dextran derivatives, hyaluronic acid, chitosan and thiolated chitosan, pullulan, cellulose derivatives and heparin, along with client-supplied specialty carbohydrates.

What conjugation chemistries are commonly used?

Typical chemistries include periodate oxidation followed by reductive amination, EDC/NHS coupling of carboxyl to amines, oxime/hydrazone ligation to aldehydes/ketones, thiol–maleimide coupling with thiolated sugars and azide–alkyne click chemistry with appropriately functionalized partners.

More FAQ'sAll FAQ's

Contact & Quote Request

For the fastest review, send your carbohydrate or polysaccharide scaffold, payload, available functional groups, desired conjugation strategy, quantity, purity target, and intended application. We will recommend a glycoconjugation approach, linker design, purification strategy, and fit-for-purpose QC plan.

Fast quote checklist

  • Carbohydrate or polysaccharide scaffold, MW range, and source
  • Payload type: drug, peptide, protein, antibody, oligonucleotide, dye, or surface
  • Available handles: amine, carboxyl, aldehyde, hydrazide, thiol, azide, alkyne, etc.
  • Desired application: targeting, vaccine, imaging, assay coating, delivery, or diagnostics
  • Target quantity, purity, documentation, and QC requirements

Fastest path

Request a Quote See Chemistries

Recommended Reading & Bio-Synthesis Resources

Key references on glycoconjugation, carbohydrate-based bioconjugation, glycan recognition, GalNAc delivery, and polysaccharide conjugate design.

  • Varki, A. et al. Essentials of Glycobiology, 4th edition. Cold Spring Harbor Laboratory Press (2022). Link: NCBI Bookshelf
  • Werz, D. B.; Ranzinger, R.; Herget, S.; Adibekian, A.; von der Lieth, C. W.; Seeberger, P. H. Exploring the structural diversity of mammalian carbohydrates (“glycospace”) by statistical databank analysis. ACS Chemical Biology (2007). DOI: 10.1021/cb700178s
  • Nair, J. K. et al. Multivalent N-acetylgalactosamine-conjugated siRNA localizes in hepatocytes and elicits robust RNAi-mediated gene silencing. Journal of the American Chemical Society (2014). DOI: 10.1021/ja505986a
  • Astronomo, R. D.; Burton, D. R. Carbohydrate vaccines: developing sweet solutions to sticky situations? Nature Reviews Drug Discovery (2010). DOI: 10.1038/nrd3012
  • Mettu, R.; Chen, C. Y.; Wu, C. Y. Synthetic carbohydrate-based vaccines: challenges and opportunities. Journal of Biomedical Science (2020). DOI: 10.1186/s12929-020-00632-7
  • Hermanson, G. T. Bioconjugate Techniques, 3rd edition. Academic Press (2013). Link: ScienceDirect

These references support core concepts used in glycoconjugation services, including glycan recognition, carbohydrate ligand design, GalNAc-mediated liver targeting, polysaccharide scaffolds, and conjugation chemistry selection.

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Greetings Researchers,

Please be advised that any information, guidelines, writeups, and oral/video/graphic content on our website are intended solely as general guidelines.
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their designs to Biosynthesis for review of production feasibility.
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