N-Succinimidyl 6-Biotinamidohexanoate | CAS 72040-63-2

N-Succinimidyl 6-Biotinamidohexanoate is a biotinylation reagent built on an N-hydroxysuccinimide (NHS) ester for efficient conjugation to primary amines. As an NHS-activated ester, it is widely used in bioconjugation workflows that precede downstream click chemistry, including labeling of proteins, peptides, and biomaterials with a biotin handle. Its extended biotin spacer (6-aminohexanoate) helps reduce steric constraints, making it a common choice for generating biotin-functional targets for streptavidin-based capture and for subsequent bioorthogonal coupling strategies.

1. Protein Biotinylation

N-Succinimidyl 6-Biotinamidohexanoate is commonly used to introduce biotin tags onto lysine-rich proteins and antibody fragments, enabling uniform labeling for assay development and molecular interaction studies. In research settings, the reagent is used to generate biotinylated proteins for immobilization on streptavidin-coated surfaces, for pull-down experiments, and for preparing labeled reagents that can be integrated into multi-step bioconjugation pipelines. The NHS ester chemistry targets accessible primary amines under standard bioconjugation conditions, producing biotin-functional biomolecules that serve as robust handles for affinity capture and for subsequent click-enabled assembly of larger constructs.

2. Surface Immobilization Assays

N-Succinimidyl 6-Biotinamidohexanoate supports the creation of biotin-functional coatings on assay platforms and biosensor surfaces where immobilization via streptavidin is preferred. Researchers use this reagent to biotinylate carrier proteins or surface-reactive layers, which can then be anchored to streptavidin-functionalized substrates to produce reproducible capture surfaces. This application is frequently encountered in workflow development for protein arrays, ligand-binding assays, and imaging sample preparation, where controlled surface presentation of biotinylated biomolecules improves experimental consistency and simplifies downstream handling.

3. Antibody and Affinity Reagent Labeling

N-Succinimidyl 6-Biotinamidohexanoate is widely applied to label antibodies, nanobodies, and other affinity reagents with biotin for modular assembly into detection and enrichment formats. By installing biotin on amine-containing sites, the reagent enables straightforward linkage to streptavidin-based reporters, beads, or multivalent platforms, which is particularly useful when integrating biotinylated probes into larger experimental designs. In chemical biology and molecular imaging tool development, biotinylated antibodies and binders generated with this reagent are often used as standardized building blocks for constructing probe panels and for enabling affinity-based purification steps prior to further bioorthogonal conjugation.

4. Bioconjugation for Click Workflows

N-Succinimidyl 6-Biotinamidohexanoate is frequently selected as a preparative biotinylation step that creates biotin-bearing substrates for later click chemistry and modular assembly. Many workflows use biotinylated proteins, peptides, or biomaterial-bound ligands generated with this NHS ester as standardized starting materials that can be captured, concentrated, or oriented using streptavidin prior to coupling with other functional partners. The resulting biotin handle can be leveraged to organize complex conjugates, including multi-component labeling strategies and probe architectures where controlled pre-functionalization improves reproducibility across experiments and downstream analytical readouts.