Many compounds are only reactive and not immunogenic due to their small molecular weight. These substances are called haptiens. The hapten is immunogenic only after binding with a protein carrier or a high polymer. Small molecule compound antigens are typical haptens, such as steroid hormones, fatty amines, lipids, small molecule drugs, etc. After immunizing animals with small molecule haptens coupled to the carrier proteins, primary antibodies, namely small molecule antibodies.

The small molecule antibodies provided by Abvigen Inc can all bind specifically to their antigen counterparts and are suitable for ELISA and LF experiments. The company also provides conjugation services for small molecule antigens and mmab development services.