양파(Allium cepa L.) 유전자원의 Flavonol 배당체 조성 및 함량

The Compositions and Contents of Flavonol Glycosides in Onion (Allium cepa L.) Germplasm

Flavonols as a major kind of plant secondary metabolites are known for health-promoting compounds in onions (Allium cepa L.). The objectives of this study are to determine profiles of flavonol glycosides in different 75 onion accessions. A total of five flavonols (quercetin 3,4 - diglucoside, Q34 diG; quercetin 3-glucoside, Q3G; quercetin 4 -glucoside, Q4 G; isorhamnetin 4 -glucoside, I4 G; quercetin, Q) were identified from onion accessions. In positive ion mode using LC-ESI-MS, individual flavonols were confirmed from one and two glycosylation binding with aglycone such as quercetin and isorhamnetin. Total flavonol contents were distributed in white onion (range of 0.18-6.47 mg/g DW) and purple onion accessions (range of 2.39-6.47 mg/g), respectively. The mean of flavonol contents in purple onion (4.41 mg/g) showed 1.4-fold higher than white onion (3.23 mg/g). The Q34 diG and Q4 G were considered as the major compounds of flavonol glycosides in onion accessions.