Abstract
Objective Methanolic extract of Amaranthus spinosus (A. spinosus) leaves was screened for antioxidant and antipyretic activities. Methods Antioxidant activity was measured by 1,1-diphenyl-2-picryl-hydrazile (DPPH) free radical scavenging, superoxide anion radical scavenging, hydroxyl free radical scavenging, nitric oxide radical scavenging, 2,2 '-azinobis-3-ethylbenzothiazole-6-sulfonic acid (ABTS) radical scavenging assays and total phenolic content was also determined. Antipyretic activity of methanolic extract of A. spinosus was measured by yeast induced pyrexia method at concentration of 200 and 400 mg/kg using paracetamol as standard drug. Results Methanolic extract of A. spinosus showed potent antioxidant activity. The IC 50 value was (87.50 ±3.52) μg/mL, (98.80±1.40) μg/mL, (106.25±0.20) μg/mL, (88.70±0.62) μg/mL and (147.50±2.61) μg/mL for DPPH, superoxide, hydroxyl, nitric oxide and ABTS radical scavenging activities. Methanolic extract of A. spinosus showed significant (P <0.01) antipyretic activity.
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