Conclusion
In this study, an efficient enzymatic route for PAGs synthesis by the esterification of PAs with glycerol under solvent-free condition was developed. The optimal process conditions for the synthesis of PAGs were: 25 % Lipozyme435, molar ratio of PAs to glycerol 1:150, reaction temperature 80 ℃, and reaction time 10 h. Under the optimal conditions, three kinds of PAGs including CG, FG and p -HCG were synthesized and identified by MS, 1H NMR and 13C NMR with the isolated yield of 85.0 %, 82.1 % and 80.7 %, respectively. Among them, CG showed a comparative free radical scavenging ability to CA, indicating that CG may be used as a water-soluble antioxidant alternative to CA for food and cosmetic applications.