Antioxidative Properties of Acyl Ascorbates on Lipid Oxidation in Bulk, Disperse and Microcapsule Systems

Acyl ascorbates were synthesized through the condensation of L-ascorbic acid with various fatty acids using an immobilized lipase in water-miscible organic solvent, and their antioxidative properties on lipid oxidation in bulk, disperse and microcapsule systems were examined. The optimal conditions for enzymatic synthesis in a batch reaction were determined and the continuous production of acyl ascorbate was conducted using a continuous stirred tank reactor and a plug flow reactor. The oxidative stability of lipid with saturated acyl ascorbate in bulk system increased with increasing acyl chain length, whereas that in the oil-in-water emulsion and microcapsule system depended on the acyl chain length and the concentration of the ascorbate.