Study on Antioxidant Activity of 'Yunxin' Walnut Oil and Juglans sigillata Oil

The peroxide value (POV) and acid value (AV) of 'Yunxin' walnut and Juglans sigillata oil were measured with 3 different antioxidants including TBHQ, tea polyphenols and rosemary oil. The results show that according to the POV value, the optimum ratio of 3 antioxidants for J. sigillata walnut is tert-butylhydroquinone (TBHQ) 0.02% + oil soluble tea polyphenols 0.04% + rosemary 0.04%; and the best ratio of 3 kinds of antioxidants in 'Yunxin' walnut, that is tert-butylhydroquinone (TBHQ) 0.01% + oil soluble tea polyphenols 0.04% + rosemary 0.02%. According to the AV value, the best ratio of 3 antioxidants for J. sigillata walnut is tert-butylhydroquinone (TBHQ) 0.015% + oil soluble tea polyphenols 0.04% + rosemary 0.06%; and the best ratio of 3 kinds of antioxidants for the 'Yunxin' walnut, namely, tert-butylhydroquinone (TBHQ) 0.01% + oil soluble tea polyphenol 0.06% + rosemary 0.08%.