ONION PEEL POWDER: SOURCE OF BIOACTIVE ANTIOXIDANT PHENOLIC QUERCETIN DERIVATIVES

Authors : Özlem Tokuşoğlu

Pages : 658-660

View : 7 | Download : 22

Publication Date : 2024-12-29

Article Type : Research Paper

Abstract :Functional food progression and by-product/ waste management is rapidly increasing as a result of consumer consciousness regarding healthy and nutritious foods/ drugs and 1,2 value-added products. Onion peel or skin is a by-product obtained from onion processing that includes various phytochemicals, contributing to its antioxidant potential. Researches have confirmed that onion peel is a more concentrated source of phytochemicals than edible flesh, with quercetin as the major phenolic constituents in onion peel. Besides, quercetin 3,4\\\'-digly-coside, quercetin, protocatechuic acid, kaempferol, 2-(3,4-dihydroxybenzoyl)−2,4,6-trihy-droxy-3(2H)-benzofuranone, isorhamnetin, quercetin-7,4’-diglycoside, isorhamnetin-3,4’diglycoside, quercetin-3-glycoside, quercetin-4’-glucoside, isorhamnetin-4’-glycoside, protocatecoyl quercetin, quercetin dimer 4\\\'-glycoside, quercetin dimer hexoside, quercetin dimer, and quercetin trimer have been identified in onion skin. The presence of all those bioactives confers on onion peel its various therapeutic influences in preventing cancer (CA),diabetes, obesity, cardiovascular disorders, neurodegenerative problems, possible microbial detriment and erectile dysfunction. In this context, onion peel in the form of powders or extracts can be employed in diversified industries as a therapeutic and pharmaceutical agent.
Keywords : Onion, Onion Peel, Quercetin, Quercetin Glycosides, By-Product, Waste