Find a wide range of products for biotinylation, crosslinking, and modification of proteins, peptides, and antibodies. These bioconjugation reagents are commonly used to study the structure and interaction of proteins, build immunoassays, increase protein solubility, or attach molecules to surfaces. Use our crosslinking or biotinylation selection tools to find the optimal reagent for your application, or access our bioconjugation technical handbook to help improve your bioconjugation results.

3D image of protein

Reagents containing reactive ends to specific functional groups on proteins and antibodies, enabling the covalent joining or two or more biomolecules for the study of protein function and interaction.

Explore our protein crosslinking reagents
Crosslinker Selection Tool

Reagents and kits to chemically tag and label antibodies, proteins, and peptides with biotin or desthiobiotin at amino acid functional groups to create labeled antibody or other probes for streptavidin affinity binding, purification, and detection.

Explore our biotinylation reagents and kits
Biotinylation Reagent Selection Tool

3D image of biotin reaction
Tissue stained with various fluorescent dyes

Fluorescent protein labeling kits Convenient labeling kits and reactive dyes for the direct attachment of Invitrogen Alexa Fluor and other dyes for 10 μg to 1 mg of proteins or antibodies.

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Antibody Labeling Kits Selection Tool

Convenient stand-alone reactive dyes for the direct attachment to proteins or antibodies.

Explore our protein labeling reagents
Protein Labeling Selection Tool

3D image of protein and chemical structure
Chemical structures

Reagents to modify proteins by attaching functional groups or crosslinking, denaturing, or reducing disulfide bonds to study protein function and interactions.

Explore our protein modification agents

Selection tools to find the optimal labeling reagent for your experiment

Crosslinker Kits Selection Tool image
Biotinylation Reagents Selection Tool image
Antibody Labeling Kits Selection Tool image
Protein Labeling Selection Tool

Bulk or custom product request

Need larger quantities of our protein labeling, crosslinking or modification reagents? We offer bulk and custom fill sizes.

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For Research Use Only. Not for use in diagnostic procedures.