Exosomes, as natural drug transport carriers, have low immunogenicity and high biocompatibility. In order to improve the targeting delivery efficiency of exosomes, targeting molecules (peptides, proteins or small molecules) need to be coupled to the exosome surface. CD Bioparticles utilizes the high affinity of biotin and streptavidin to modify exosomes and provides exosome modification kits to help researchers quickly, conveniently and efficiently modify target molecules. Biotin and streptavidin have a very high affinity for each other, the reaction is highly specific, the dissociation constant of the formed complex is very small, irreversible, and the product is highly stable, so the biotin-affinity system has become a general and universal research methodology in the biological field. CD Bioparticles provides exosome modification kits to help researchers to quickly, conveniently and efficiently.