ABTS radical scavenging capacity (aRSC). The ARSC was determined according to Re et al. (1999) with some modifications. Briefly, ABTS+ was generated by reacting 7 mM ABTS with 2.45 mM potassium persulfate. In the assay, samples were mixed with PBS (pH 7.4) diluted ABTS+ (absorbance of 0.70 ± 0.02 at 734 nm) at a ratio of 1 : 100 (v/v), and the absorbance reading (734 nm) was taken after 6 min incubation in the dark. The AA (%) was calculated. The relative activity was calculated using a trolox calibration curve and the results were converted to TEAC (trolox equivalent antioxidant capacity) value for further relative contribution of antioxidants analysis.