The phytochemical, antioxidant, antifungal and antibacterial activities of the aerial part of macrophyte paspalum repens P. J. Bergius

Abstract

The aerial part of Paspalum repens was herein chemically and biologically assessed. The rosmarinic acid and a mix of the flavonoids quercetin-3-O-β-D-glucopyranoside and quercetin-3-O-β-D-(6-E-caffeoyl)) glucopyranoside were isolated through chemical investigation. The structures of the isolated compounds were elucidated based on their NMR (1D and 2D) data. The crude extract, hexane, ethyl acetate and n-butanol fractions were evaluated for biological activity. The ethyl acetate fraction showed significant DPPH freeradical scavenging activity with CE50 18.88 ± 0.34 mg.mL-1, and total phenols EAT 110.79 mg.mL-1. The crude extract, hexane, ethyl acetate and n-butanol fraction were inactive against the following microorganisms: Staphylococcus aureus, Bacillus subtilis, Escherichia coli, Pseudomonas aeruginosa and Candida albicans. The present study is the first one about the herein assessed aquatic plant.