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Free-radical scavenging activity of Aloe vera extract, AgNPs using Aloe vera leaf extract (GAgNPs), chemically synthesized AgNPs (CAgNPs), and ascorbic acid (AA). The ability of Aloe vera extract, GAgNPs, CAgNPs, and AA (used as the reference antioxidant) to inhibit DPPH was estimated as a function of increasing concentration (from 50 to 200 μg/ml) and by recording the decrease in absorbance at 517 nm.
