The lipid stability of walnut added with water extracts of Ganoderma lucidum, Camellia sinensis and Lycii fructus was studied. The results are as follows : 1. when the extracts were added to walnut, the lipid stability was improved. The antioxidative activities of water extract of Camellia Sinensis and Lycii Fructus were considerably higher than that of Ganoderma lucidum. The antioxidative activity was decreased in the rank order Lycii Fructus$gt;Camellia Sinensis$gt;Ganoderma lucidum. 2. This clearly suggests that water extract of Lycii Fructus at 4℃ Bx level can be used as an alternative natural antioxidant for the lipid stability of walnut.

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