1-(2-Aminoethyl)-1H-pyrazol-4-ylphosphonic acid linker/BSA is the conjugate of 1-(2-Aminoethyl)-1H-pyrazol-4-ylphosphonic acid linker (1-(2-氨基乙基)-1H-吡唑-4-基膦酸连接子) and bovine serum albumin (BSA). By conjugating the antigen with a protein adjuvant , it enhances the production of antigen-specific antibodies in vaccine models. The conjugate does not affect protein folding or disrupt key epitopes, and it can enhance cross-presentation and the generation of antigen-specific T cells.