《Table 1IC50 values of crude extract, BHT and quercetin.》

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《"Endophytic actinobacteria of medicinal plant Aloe vera: Isolation, antimicrobial, antioxidant, cytotoxicity assays and taxonomic study"》

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Values represent mean±standard deviations for triplicate experiments.

To evaluate the antioxidant activity of NAF-1 crude extract，several tests were performed，and the IC50 of crude extract and those of BHT and quercetin were given in Table 1.The result showed that our crude extract exhibited an interesting free radical-scavenging activity with IC50 value of（5.58±0.26）μg/mL better than those in BHT and quercetin.Concerning毬-carotene acid bleaching test，IC50 value of the crude extract was less effective than BHT and more effective than quercetin.Furthermore，the reducing power IC50 values were significantly lower than those obtained for synthetic antioxidant agents.Our crude extract showed a high value of phenolic and flavonoid compounds with（15.41±0.18）μg GAE/mg extract and（11.41±0.06）μg QE/mg extract respectively.