title: Effect of different exposed lights on quercetin and quercetin glucoside content in onion (Allium cepa L.).
abstract: Quercetin and quercetin glucosides are the major flavonols present in onion (Allium cepa L.) and are predominantly present as quercetin, quercetin-3,4'-diglucoside and quercetin-4'-glucoside. Effect of different light wavelengths on onion after harvest and storage, with fluorescent, blue, red and ultra violet light influenced the quercetin and quercetin glucosides profile. In a peeled onion, all the light treatments elevated quercetin content in bulb. Among them, particularly fluorescent light effect was more eminent which stimulates the maximum synthesis of quercetin in onion. In case of whole onion bulb, skin and pulp showed different responses to light treatment, respectively. The pulp had the highest quercetin glucosides under blue light, whereas the lowest under fluorescent light. Onion skin showed nearly opposite pattern as compared to the pulp. In particular, light treatment proved to be a better way to increase the level of quercetin content in onions which might be utilized for industrial production of bioactive compounds from onion and onion waste products.
authors.affiliation: Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul 143-701, Republic of Korea.
authors.forename: Eun Young
authors.initials: EY
authors.lastname: Ko
authors.affiliation: Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul 143-701, Republic of Korea.
authors.forename: Shivraj Hariram
authors.initials: SH
authors.lastname: Nile
authors.affiliation: Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul 143-701, Republic of Korea.
authors.forename: Kavita
authors.initials: K
authors.lastname: Sharma
authors.affiliation: Department of Food Science, Agricultural College, Yanbian University, Park Road 977, Yanji City, Jilin Province 133002, China.
authors.forename: Guan Hao
authors.initials: GH
authors.lastname: Li
authors.affiliation: Department of Bioresources and Food Science, College of Life and Environmental Sciences, Konkuk University, Seoul 143-701, Republic of Korea.
authors.forename: Se Won
authors.initials: SW
authors.lastname: Park
keywords: Light effect; Onion; Quercetin; Quercetin glucosides