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Preparation of Protein Conjugates via Homobifunctional Diselenoester Cross-Linker.

Adipic acid diselenoester was developed as an efficient cross-linker for covalent protein conjugation with a variety of small molecular haptens, including mono- and disaccharides, peptide, fluorescence dye, and nicotine. Compared to the counterparts of N-hydroxysuccinimide (NHS) and p-nitrophenyl (PNP) linkers, the diselenoester linker demonstrates improved balance between reactivity and stability and coupling of haptens to proteins under mild conditions with high incorporation efficiency.