Small molecule compound antigens are the most typical haptens, such as some organic substances with a molecular weight of less than 4000, such as most polysaccharides, steroid hormones, fatty amines, lipidoids, pharmaceutical intermediates, certain small molecular weight drugs, and the like. Bioconjugation is the attachment of biologically active small molecules to antibodies via chemical bonds, which are involved in competitive immune responses in vitro diagnostic reagent assays. Our company has rich experience in small molecule coupling and immunization, and can provide bio-coupled activators for scientific research.