2.2.5. Determination of antioxidant activities
The scavenging activity of hydroxyl radicals was measured according to the method described by Yuan et al. (2005) with some modifications.
1.0 mL test samples were mixed with 1.0 mL of phosphate buffer (0.4 mM, pH 7.4), 1.0 mL 1,10-phenanthroline hydrate(2.5 mM), 1.0 mL FeSO4(2.5 mM) and 0.5 mL H2O2(20 mM, 1%, v/v).
The mixtures were incubated for 60 min at 37◦C, the absorbances of the mixtures were measured at 536 nm against a reagent blank after the reaction.
The DPPH scavenging activity of the samples was measured using the modified method of Sun et al. (2008). 4.0 mL of 95%ethanol solution of DPPH (0.1 mM) was incubated with test sam-ples (1.0 mL).
The reaction mixture was shaken well and incubated for 30 min at 33◦C in the dark and the absorbance of the resulting solution was read at 517 nm against a blank, the radical scavenging activity was measured as a decrease in the absorbance of DPPH.
2.2.5. Determination of antioxidant activitiesThe scavenging activity of hydroxyl radicals was measured according to the method described by Yuan et al. (2005) with some modifications. 1.0 mL test samples were mixed with 1.0 mL of phosphate buffer (0.4 mM, pH 7.4), 1.0 mL 1,10-phenanthroline hydrate(2.5 mM), 1.0 mL FeSO4(2.5 mM) and 0.5 mL H2O2(20 mM, 1%, v/v).The mixtures were incubated for 60 min at 37◦C, the absorbances of the mixtures were measured at 536 nm against a reagent blank after the reaction.The DPPH scavenging activity of the samples was measured using the modified method of Sun et al. (2008). 4.0 mL of 95%ethanol solution of DPPH (0.1 mM) was incubated with test sam-ples (1.0 mL). The reaction mixture was shaken well and incubated for 30 min at 33◦C in the dark and the absorbance of the resulting solution was read at 517 nm against a blank, the radical scavenging activity was measured as a decrease in the absorbance of DPPH.
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