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.