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DPPH radical scavenging activity of the extracts of R. officinalis. Catechin was used as a positive control. The presented data represent the mean of three independent measurements with an average 5–7% error. Data were analyzed using one-way ANOVA *** and **** indicate significance at p < 0.05 when compared to aqueous with p values 0.006 and 0.001, respectively.
