Enzyme-catalyzed synthesis of ASGPR ligand-targeted modifier in non-aqueous medium

The asialoglycoprotein receptor (ASGPR) was used to mediate drug carrier for hepatic targeted drug delivery, this article showed the enzyme-catalyzed esterification of galactose and vinyl stearate and a kind of ASGPR ligand-targeted which was used to insert the surface of liposome has been synthesized.  The structure of product has been confirmed by TLC, ESI-MS and ¹H NMR.  The factors of types and quantity of enzyme, organic solvents, molar ratio of substrate, temperature and time of reaction have been studied.  Results showed when using acetone as reaction medium, the quantity of Novozym 435 immobilized lipase was 30 mg·mL⁻¹,  molar ratio of galactose to vinyl stearate was 1∶5, and reacted at 60 ℃ for 12 h, the transformation of vinyl stearate reached more than 70%.  This study provides a novel and efficient route to the synthesis of ligand-  targeted modifier.