Abstract
Decarboxylation of ferulic acid would increase the solubility in oils. Rice bran extract (RBE) containing 29mg ferulic acid/g RBE was decarboxylated to obtain decarboxylated rice bran extract (DRBE), and its antioxidant capacity in oil system was studied. After addition of DRBE (500ppm), oxidation was monitored for 20days at 60°C under the dark. To compare the oxidation degree, 500ppm of ferulic acid and well-known lipid soluble antioxidant, α-tocopherol, were used. Contents of conjugated dienes and aldehydes were measured using 1H NMR as well as peroxide value (POV). On 7days of oxidation, DRBE (539.0meq/kg oil) showed lower POV than the control (819.7meq/kg oil). Also, contents of total conjugated form and aldehydes were 194.60, and 5.94mmol/L oil, which were lower than those of control (323.63 and 15.94mmol/L oil). However, after 10days of oxidation, antioxidant capacity of DRBE was not observed.
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