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The present study reports the antioxidant and membrane protective activities of  Calotropis procera  aqueous root extract using several  in vitro  assays along with the determination of phenolic as well as flavonoid contents. Total phenol and flavonoid contents in extract were 15.67 ± 1.52 mg propyl gallate equivalent/g and 1.62 ± 0.05 mg quercetin equivalent/g, respectively. UV-visual spectroscopic scanning of the extract indicated the presence of glycoside-linked tannins or flavonoids. The extract exhibited appreciable reducing power signifying hydrogen donating potential. DPPH radical scavenging assay revealed substantial free radical scavenging activity (42–90%) in the extracts. Concentration dependent response was observed in the metal ion chelating activity (16–95%). Extracts also provided protection against iron induced lipid peroxidation in rat tissue (liver, brain, and kidney) homogenates. Comparatively better protective efficacy against peroxidative damage was observed in liver (71%) followed by kidney (65%) and brain (60%) tissues. Positive correlation ( r   2  = 0.756) was observed between DPPH free radical scavenging activity and reducing power of extract. Similarly strong positive correlation ( r   2  ≈ 0.756) was observed between metal ion chelating ability and percentage lipid peroxidation inhibition in different tissues. The study demonstrated considerable protective efficacy in  C. procera  root aqueous extracts against free radical and metal ion mediated oxidative damage.

Calotropis proceraRoot Extract Has the Capability to Combat Free Radical Mediated Damage