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Evaluation of antioxidant and antimicrobial potential of a novel Himalayan plant Reinwardtia indica dumort: Scientifically unexplored.

Microbial Pathogenesis 2018 December 13
Reinwardtia indica (Lineceae) is a medicinal plant cultivated in the Himalayan region. It is effectively used in folk medicines for the treatment of various health complications. In the present study, the shade dried leaves and stem were extracted in three different solvents such as ethyl acetate, ethanol, and hydro-alcoholic. The antioxidant efficacy of these extracts was confirmed by using different in vitro assays: DPPH free radical scavenging, superoxide radical scavenging, lipid peroxidation, metal ion chelating capability and reducing power determination. Total phenol content was maximum in hydro alcoholic extract of leaf (540.37 mg per g of gallic acid equivalents) and stem (330.51 mg per g of gallic acid equivalents) while flavonoid content was maximum in ethanolic extract of leaf (305 mg per gram of rutin equivalents) and ethyl acetate extract of stem (170.6 mg per gram of rutin equivalents). The antioxidant activity of these extracts was positively correlated with their total phenol and flavonoid content. Among all tested extracts, ethanolic extract of leaf exhibit maximum zone of inhibition against all tested clinical isolates of bacterial (E. coli 11.00 ± 1.73 mm, P. aeurogenosa 11.67 ± 0.58 mm and S. aureus 10.33 ± 1.53 mm) and fungal (C. albicans 11.33 ± 1.10 mm) pathogens, while ethyl acetate extracts of the leaf and stem showed minimum inhibitory concentration against all tested microorganisms. Thus, R. indica extracts can be used as potent natural antioxidant having antifungal and antibacterial action.

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