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Antibody–Small Molecule / Ligand Bioconjugation Services

Antibody small molecule conjugation and ligand bioconjugation services for attaching peptides, fluorescent dyes, imaging agents, GalNAc, vitamins, carbohydrates, enzymes, and targeting ligands to antibodies for research and assay applications.

Non-drug ligands • tags • cofactors • targeting molecules Imaging agents • dyes • GalNAc • peptides carbohydrates • enzymes Custom ligand
Antibody formats Ligand classes
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Overview Antibody formats Ligand classes Workflow Contact

Overview

Antibody–small molecule / ligand bioconjugation enables attachment of non-drug functional molecules to antibodies for targeting, detection, affinity capture, imaging, delivery, and custom research workflows. These conjugates combine antibody specificity with the added function of ligands such as dyes, vitamins, peptides, carbohydrates, immune agonists, degraders, and other small molecules.

We provide customized conjugation services for a broad range of non-drug ligands, selecting chemistries that preserve antibody binding while maintaining ligand function, accessibility, and stability.

Our services support feasibility evaluation, conjugation strategy design, linker selection, purification, and analytical characterization for discovery, assay development, imaging, targeting, and translational research applications.

Antibody–small molecule conjugation is also commonly referred to as antibody–ligand conjugation or antibody functionalization, and is widely used in imaging, targeting, and assay development workflows.

Representative ligand categories

From affinity tags to GalNAc and imaging ligands

Designed for non-drug conjugates including fluorescent dyes, targeting peptides, folic acid, vitamins, carbohydrates, enzymes, immune agonists, protein degraders, and other custom functional ligands.

Affinity tagsImaging agentsPeptidesGalNAcEnzymesCustom ligands
LigandScope

Broad non-drug ligand support

We organize offerings by functional ligand class so users can quickly find whether their project fits imaging, targeting, affinity, immune, carbohydrate, or custom conjugation needs.

AntibodyFormat

Format-aware conjugation strategy

Antibody format influences site accessibility, stoichiometry control, linker choice, purification behavior, and downstream performance.

ChemistryApplication

Application-driven design

Conjugation plans are selected to match ligand structure, spacer needs, stability, and the intended assay, imaging, targeting, or delivery workflow.

Antibody formats we can use for conjugation

We support conjugation across multiple antibody formats, allowing the conjugation strategy to be matched to antibody structure, ligand size, linker requirements, and the intended application.

Antibody Format Examples Typical Applications Conjugation Considerations
Whole Antibodies Full-length monoclonal antibodies Targeting, capture, imaging, and functional ligand delivery Supports broad conjugation chemistries; Fc region and available lysines or thiols can influence loading and accessibility.
IgG IgG1, IgG2, recombinant IgG Most common format for ligand, dye, peptide, and affinity-tag conjugates Well-characterized format with flexible options for random or more controlled conjugation.
IgM Pentameric or hexameric IgM High-avidity binding applications and specialized targeting systems Large multimeric structure may affect conjugation uniformity, sterics, and purification.
Antibody Fragments Fab, F(ab')₂, scFv, engineered fragments Imaging, tissue penetration, modular constructs, and compact targeting systems Smaller size can improve accessibility, but linker and site selection are critical to preserve binding.

Non-Drug Ligand Classes

Expand a ligand class to view representative examples, functional role, and common conjugation considerations for antibody-based bioconjugates.

Antibody affinity tags biotin • desthiobiotin • click handles • reporter tags
biotin desthiobiotin click handles
Ligand type Typical function Conjugation notes
Biotin and biotin derivatives Affinity capture / detection Common choice for avidin or streptavidin workflows; spacer length can reduce steric interference.
Desthiobiotin Reversible affinity interactions Useful where milder elution or reversible capture is desired.
Clickable handles (azide, alkyne, DBCO, TCO) Secondary functionalization Enables modular downstream ligation or multistep assembly workflows.
Reporter or assay tags Tracking / assay support Selected based on detection platform, handle availability, and desired signal behavior.
Vitamins, cofactors & folic acid folic acid • vitamin B12 • biotin • cofactors
folic acid vitamin B12 biotin
Ligand type Typical function Conjugation notes
Folic acid and folate derivatives Targeting ligand Often used for folate receptor-associated workflows; handle placement should preserve receptor recognition.
Vitamin B12 derivatives Targeting or functional ligand Useful for receptor-mediated concepts and specialty delivery designs.
Biotin / vitamin H Affinity label Frequently used in capture and detection workflows.
Cofactor-like molecules Functional or assay ligand Chemistry depends on stability, solvent compatibility, and the reactive handle.
Peptides, targeting ligands & small molecules targeting peptides • receptor ligands • custom binders
targeting peptides receptor ligands custom binders
Ligand type Typical function Conjugation notes
Targeting peptides Receptor or tissue targeting Spacer and orientation are important to preserve peptide accessibility and antibody binding.
Small-molecule targeting ligands Target-specific binding Requires careful handle placement to avoid blocking the binding motif.
Cell-penetrating peptides Uptake / intracellular delivery support Charge, hydrophobicity, and ligand density can affect purification and behavior.
Custom receptor ligands Project-specific targeting Feasibility depends on ligand stability, linker model, and downstream application.
Imaging agents & fluorescent dyes fluorescent dyes • NIR ligands • reporter probes
fluorescent dyes NIR ligands reporter probes
Ligand type Typical function Conjugation notes
Fluorescent dyes Optical detection / tracking Selected for brightness, photostability, and compatibility with the assay platform.
Near-infrared imaging ligands In vivo or deep-tissue imaging Hydrophobicity and quenching behavior often influence linker design.
Reporter probes Assay signal generation Requires control of labeling density to maintain antibody performance.
Other imaging agents Custom imaging workflows Conjugation route depends on functional groups and the imaging modality.
Immune agonists & functional immune ligands TLR agonists • adjuvant-like ligands • immune modulators
TLR agonists adjuvant-like ligands immune modulators
Ligand typeTypical functionConjugation notes
Immune agonist small moleculesImmune stimulationConjugation is planned to preserve functional activity while maintaining antibody integrity.
Adjuvant-like ligandsImmune activation supportSelected for immunology workflows where localization or targeted presentation matters.
Functional immune modulatorsPathway-specific research toolsSpacer design and stoichiometry may influence activity and interpretation.
Protein degraders PROTAC-like molecules • degrader ligands • targeted degradation tools
PROTAC-like molecules degrader ligands targeted degradation tools
Ligand typeTypical functionConjugation notes
PROTAC-like degradersTargeted protein degradation researchLarge bifunctional molecules often require careful linker and handle planning.
E3 ligase recruiter-containing ligandsDegradation pathway engagementConjugation should avoid disrupting key recognition motifs.
Custom degrader constructsMechanistic studiesFeasibility depends on molecular complexity, stability, and intended readout.
Carbohydrates, sugars & GalNAc carbohydrates • glycans • GalNAc • sugar ligands
carbohydrates glycans GalNAc
Ligand type Typical function Conjugation notes
GalNAc and GalNAc derivatives ASGPR-targeting workflows Frequently used for liver-targeting concepts; presentation and spacing can be critical.
Carbohydrates and sugar ligands Lectin or receptor interaction Hydrophilicity and multivalency may influence conjugation design.
Glycan-like ligands Recognition or targeting support Often project-specific and evaluated case by case.
Enzyme / protein conjugates enzymes • protein ligands • functional proteins
enzymes protein ligands functional proteins
Ligand type Typical function Conjugation notes
Enzymes Catalytic or signal amplification function Protein-protein conjugation may require gentler chemistry and activity-preserving conditions.
Small functional proteins Binding or reporter function Conjugation route is selected around available handles and structural sensitivity.
Protein ligands Recognition or functional display Orientation and steric accessibility are important for activity retention.
Other custom non-drug ligands custom molecules • specialty research ligands • feasibility-based projects
custom molecules specialty research ligands feasibility-based projects
Ligand type Typical function Conjugation notes
Custom synthetic ligands Project-specific function We assess reactive handles, stability, solubility, and intended use before route selection.
Specialty research molecules Custom assay or targeting tools Suitable when the payload is non-drug but functionally important to the final conjugate.
Non-standard functional ligands Exploratory programs Early feasibility review helps define whether direct conjugation or a linker-enabled route is preferred.

Non-Drug Ligand Conjugation Workflow

Our workflow supports early feasibility through conjugation, purification, characterization, and scale-up planning for non-drug ligand projects.

Antibody small molecule ligand bioconjugation workflow showing consultation, assessment, conjugation, purification, characterization, quality control, and final delivery

From early feasibility to purified conjugate delivery, we tailor the workflow to the structure and function of your non-drug ligand.

FAQ

What types of non-drug ligands can be conjugated to antibodies?

We support a broad range of non-drug ligands including affinity tags, vitamins, cofactors, peptides, imaging agents, fluorescent dyes, immune agonists, protein degraders, carbohydrates, sugars, GalNAc, enzymes, folic acid, and other custom functional molecules.

What antibody formats can be used for ligand conjugation?

We support whole antibodies, IgG, IgM, and antibody fragments such as Fab, F(ab')₂, and scFv. The best format depends on ligand size, application, and the desired conjugation strategy.

Can you conjugate custom small molecules or specialty ligands?

Yes. Many projects involve custom ligands or project-specific research molecules. Feasibility depends on the available reactive handle, stability, solubility, and the intended application.

How do you choose the right conjugation chemistry?

Chemistry selection depends on antibody format, ligand functional groups, desired loading, spacer requirements, and whether preserving ligand accessibility or activity is especially critical.

Will conjugation affect antibody binding or ligand function?

The conjugation strategy is designed to minimize impact on antibody binding while maintaining ligand accessibility and function. Site selection, linker design, and reaction control are important to that outcome.

What information should I provide to start a project?

Please share the antibody format, ligand identity or ligand class, any known reactive handles, desired quantity, intended application, and any relevant structural or analytical information.

More FAQ'sAll FAQ's

Contact & Quote Request

For the fastest review, please share your antibody format, ligand or ligand class, any known reactive handles, preferred conjugation strategy if known, target quantity, and intended application.

Best results start with the right project details: whether your goal is imaging, targeting, affinity capture, assay development, delivery research, or a custom functional conjugate, we can help define a practical workflow.

Helpful details to include

  • Antibody format: whole antibody, IgG, IgM, Fab, F(ab')₂, scFv, or other fragment
  • Ligand or ligand class: dye, imaging agent, peptide, GalNAc, vitamin, carbohydrate, enzyme, degrader, immune agonist, or other custom molecule
  • Available reactive group or linker preference, if known
  • Target application: imaging, assay development, targeting, affinity capture, delivery, or custom research use
  • Quantity required and any purity or characterization expectations
  • Buffer, formulation, storage, or handling requirements if applicable

Fastest Path

Send your project details directly and our team can review feasibility, conjugation options, and next steps.

Request a Quote Contact Us

After review, we can recommend an antibody format, payload attachment strategy, and supporting workflow based on your project goals.

Why Choose Bio-Synthesis

Trusted by biotech leaders worldwide for over 45+ years of delivering high quality, fast and scalable synthetic biology solutions.

Greetings Researchers,

Please be advised that any information, guidelines, writeups, and oral/video/graphic content on our website are intended solely as general guidelines.
It is the researcher's sole responsibility to conduct thorough research on the designs of the products intended for their experiments before submitting
their designs to Biosynthesis for review of production feasibility.
Thank you for your understanding.

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