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Evaluation of antioxidant capacity of SAC DPPH Free Radical Scavenging Capacity Assay Kit (Nanjing Jiancheng Bioengineering Institute, A153-1-1, Nanjing, China): Prepare the working solution according to the kit instructions, mix with different concentrations of SAC solution, incubate in the dark at 25℃ for 30 min, centrifuge at 4000 rpm for 5 min, transfer 100µL to a cuvette, zero with 80% methanol, and measure absorbance at 517 nm