ISSN 2169-303X
International Journal of Medicinal Plants Research ISSN 2169-303X Vol. 9 (1), pp. 001-003, January, 2020. © International Scholars Journals
Short Communication
Increase in flavonoids content in red onion peel by mechanical shredding
Sameh F. AbouZid1 and Gamal M. Elsherbeiny2
1Department of Pharmacognosy, Faculty of Pharmacy, Beni-Sueif University, Beni-Sueif, Egypt.
2Department of Pharmacology, Faculty of Pharmacy, Beni-Sueif University, Beni-Sueif, Egypt.
Accepted 19 October, 2019
Abstract
Quercetin, a bioflavonoid extracted from red onion peel, has a marked inhibitory activity against phosphodiesterase 5A. Mechanical shredding of red onion peel increased its total flavonoid content two fold compared to control. Change in individual flavonoid content was studied using HPLC. Quercetin 4'-O- -glucopyranoside showed the highest increase in content after shredding with slight change in quercetin content. Radical scavenging activity was assayed using DPPH. Extract of the shredded peel showed lesser activity (19.7%) compared to the control (31.2%).
Key words: Allium cepa, Alliacea, red onion peel, flavonol, quercetin 4'-O-ß-glucopyranoside.