Effects of Addition of L-Ascorbyl Stearate on the Antioxidative Activity of α-Tocopherol

Abstract

The synergistic property of L-ascorbyl stearate to the antioxidative activity of α-tocopherol was examined by active oxygen method(AOM)at 98°C, in the lard system.
L-Ascorbyl stearate did not show the antioxidative activity in case of single addition, but it showed the synergistic activity in combination with α-tocopherol. Although AOM hr(hours to reach 100meq/Kg POV)of lard supplemented with α-tocopherol(2.5×10^-4M)was about 25 hours, addition of L-ascorbyl stearate(5×10^-4M)to lard containing α-tocopherol(2.5×10^-4M)prolonged the AOM hr to approximately 33 hours. This molar concentration ratio of a-tocopherol and L-ascorbyl stearate exerted highly effective antioxidative activity, and the effectiveness was further strengthened by addition of citric acid to the combination system. The addition of copper(0.4ppm)or iron(2.0ppm)ion to the lard system containing α-tocopherol, L-ascorbyl stearate and citric acid did not influence on the antioxidative activity.