Antimicrobial activity and antioxidant properties of Brucea mollis Wall. ex Kurz: a medicinal plant of Northeast India
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RESEARCH ARTICLE
Antimicrobial activity and antioxidant properties of Brucea mollis Wall. ex Kurz: a medicinal plant of Northeast India Prapty Das1 · Sneha Hasnu1 · Lipika Lahkar1 · Saurov Mahanta1 · Sashin Kumar Borthakur1 · Bhaben Tanti1 Received: 20 April 2020 / Accepted: 11 August 2020 © Institute of Korean Medicine, Kyung Hee University 2020
Abstract Brucea mollis Wall. ex Kurz is a potent medicinal plant occurring on hill slopes of Karbi Anglong district of Assam. The species is popularly known to have antimalarial activity in traditional medicine by a few ethnic communities of Northeastern regions. In the present study, an attempt was made to study the antimicrobial and antioxidant activity of B. mollis. The antibacterial and antifungal activity of plant extracts was screened by the disc diffusion method of Kirby-Bauer sensitivity test against Bacillus subtilis, Staphylococcus aureus, Pseudomonas aeruginosa, Serratia marcescens, Aspergillus fumigatus and Aspergillus niger. Among all the extracts (leaf ethanol, leaf methanol, callus ethanol, and callus methanol), the callus ethanol extracts was found to exhibit better antimicrobial activity against all the bacterial strains at 20 mg/ml concentration. Callus ethanol extracts exhibited maximum inhibition 17.33 ± 0.33 mm against B. subtilis. In case of antifungal activity, leaf methanol extracts exhibited 17.66 ± 0.33 mm against A. fumigatus and leaf ethanol extracts exhibited 18.33 ± 0.33 mm inhibition against A. niger at 20 mg/ml. The minimum inhibitory concentration (MIC) of the both leaves and callus against the bacterial and fungal strains exhibited lowest 0.156 mg/ml MIC against (A) niger from leaf methanol extract; against (B) subtilis, S. aureus and A. fumigatus from callus ethanol extract and against S. marcescens from callus methanol extract. Moreover, DPPH, Hydrogen peroxide (H2O2) radical scavenging activity, reducing power assay, total phenolic, and flavonoid content were investigated. Both the extracts showed antioxidant activity in a dose-dependent manner and ethanolic extract exhibited better antioxidant properties than methanolic extract. Keywords Antimicrobial activity · Aantioxidant properties · Medicinal plant · Brucea mollis · MIC
Introduction Brucea mollis belonging to the family Simaroubaceae is a bitter deciduous shrub well known for its potent antimalarial properties in Northeast India. It is a potent medicinal plant used traditionally by several ethnic communities of Northeast India. Its local name is known as ‘koinine’ in Assam (India) and distributed in Nepal, China, Bhutan, Cambodia, Laos, Malaysia, Myanmar, Philippine, Thailand, and Vietnam (Borthakur et al. 2018; Das et al. 2018; Pullaiah 2006). In India, the species is found in parts of West Bengal, Sikkim, Arunachal Pradesh, Assam, Nagaland, Manipur, and Meghalaya (Hajra et al. 1997). The species has several medicinal properties like anticancer, antitumor, * Bhaben Tanti [email protected] 1
Plant Molecular Biology Laboratory, Department of Botany, Gauhati University,
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