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Table 1 Level of free radical inhibition by extracts from R. caffra as accessed on DPPH

From: Antagonistic effect of alkaloids and saponins on bioactivity in the quinine tree (Rauvolfia caffra sond.): further evidence to support biotechnology in traditional medicinal plants

Extract source Free radical inhibition (%)
Leaves 70.55 ±1.26
Stem bark 79.65 ± 1.86
Commercial quercetin (positive control) 82.63 ± 2.00
Methanol (negative control) 0.00 ± 0.00
  1. Commercially available quercetin was used as control.
  2. Inhibition values (%) are the means of triplicate measurement (n = 3) ± STD.