Modified from Cai and colleagues (30) by preparing a solution of ABTS • + ABTS solution concentration 7 mM and sodium persulfate (potassium persulphate) in the ratio 1: 1 were incubated in the dark. At room temperature for 12 hours, then mixed with a solution of peptides through techniques ultra filtration applications at different concentrations in the ratio of 1: 30 incubated for 10 minutes and measured the light absorption. Wavelength 734 nm by testing samples at three over after calculating percentages of eliminating free radicals. Calculated as the lowest concentration that can eliminate free radicals percent 50 (IC50) is acid Ascorbate Beith (ascorbic acid) is chemically eliminate free radicals, which are used as positive control be calculated according to the formula
A control. is the absorbance of DPPH solution that is not pre-extract.
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