SMCC is widely used in bioconjugation processes, particularly for linking proteins, peptides, or antibodies to other molecules such as enzymes, fluorescent dyes, or nanoparticles. Its primary application lies in the development of diagnostic assays and targeted therapeutics, where precise coupling of biomolecules is essential. The reagent contains an NHS ester that reacts efficiently with primary amines on proteins and a maleimide group that selectively binds to sulfhydryl groups, enabling controlled crosslinking under mild conditions. This makes SMCC especially valuable in creating stable antibody-drug conjugates (ADCs) and in immobilizing biomolecules onto sensor surfaces or solid supports for biosensors and microarrays. Its heterobifunctional nature minimizes self-polymerization and allows stepwise conjugation, enhancing the purity and reproducibility of the final product.