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   Superoxide radicals were generated by pyrogallic acid method (Meng et al., 2005),and the method was innovated slightly. The system contained 4.5 ml of Tris¨CHCl buffer (0.05 mol, pH 8.2), 1 ml of sample solution, 0.4 ml of pyrogallic acid(3.0 mmol), and 0.5 ml of thick hydrochloric acid for termination the reaction. Thesolution was incubated at 25¡æand determined at 299 nm. In blank, sample solution was substituted with Tris¨CHCl buffer.
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of the test sample, and A0 was absorbance of the blank.
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