ONION PEEL POWDER: SOURCE OF BIOACTIVE ANTIOXIDANT PHENOLIC QUERCETIN DERIVATIVES

Yıl 2024, Cilt: 7 Sayı: 15, 658 - 660, 29.12.2024

Özlem Tokuşoğlu

Öz

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.

Anahtar Kelimeler

Onion, Onion Peel, Quercetin, Quercetin Glycosides, By-Product, Waste

Kaynakça

• Tokuşoğlu Ö. 2018. Vegetable By-Product-Based Food Powders and Utilizations- Onion Peel Powder (Chapter 3) p 65-67, In BOOK. `Food By-Product Based Functional Food Powders`, (The Nutraceuticals: Basic Research/Clinical Application Series Book) CRC Press, Taylor & Francis Group, Boca Raton, Florida, USA. ISBN 9781482224375. 306 page.
• Tokuşoğlu Ö. 2018. Onion Peel Powder, Source of Phenolic Quercetin Diglucosides: Antioxidant and Antibacterial Aspects and Consumption Properties. Food for Life Portal, Food, Cancer and Nutrition Corner, January 2018, Çankaya, Ankara.