Open AccessPhytochemical investigation and antimicrobial activity of Psidium guajava L. leaves
Author(s) -
Aly M. Metwally,
Abeer Omar,
Fathalla M. Harraz,
Samah M. El Sohafy
Publication year - 2010
Publication title -
pharmacognosy magazine
Language(s) - English
Resource type - Journals
eISSN - 0976-4062
pISSN - 0973-1296
DOI - 10.4103/0973-1296.66939
Subject(s) - quercetin , antimicrobial , phytochemical , psidium , traditional medicine , chemistry , extraction (chemistry) , flavonoid , biology , botany , chromatography , biochemistry , antioxidant , medicine , organic chemistry
Psidium guajava L. leaves were subjected to extraction, fractionation and isolation of the flavonoidal compounds. Five flavonoidal compounds were isolated which are quercetin, quercetin-3-O-α-L-arabinofuranoside, quercetin-3-O-β-D-arabinopyranoside, quercetin-3-O-β-D-glucoside and quercetin-3-O-β-D-galactoside. Quercetin-3-O-β-D-arabinopyranoside was isolated for the first time from the leaves. Fractions together with the isolates were tested for their antimicrobial activity. The antimicrobial studies showed good activities for the extracts and the isolated compounds.