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.

ABSTRACT
 재료 및 방법
  공시 재료
  시약 및 기기
  Flavonol 추출
  HPLC 및 LC-MS 분석방법
 결과 및 고찰
  양파 유전자원으로부터 flavonol 배당체의 분리 및 동정
  Flavonol 배당체의 mass fragment 패턴
  양파 유전자원의 flavonol 배당체 함량 분포
 적 요
 사 사
 인용문헌(REFERENCES)

• 이정로( 농촌진흥청 국립농업과학원 ) | Jung-Ro Lee ( National Academy of Agricultural Science, RDA, 249, Seodun-dong, Suwon, Republic of Korea )
• 이민기( 농촌진흥청 국립농업과학원 ) | Min-Ki Lee ( National Academy of Agricultural Science, RDA, 249, Seodun-dong, Suwon, Republic of Korea )
• 김헌웅( 농촌진흥청 국립농업과학원 ) | Heon-Woong Kim ( National Academy of Agricultural Science, RDA, 249, Seodun-dong, Suwon, Republic of Korea )
• 이성현( 농촌진흥청 국립농업과학원 ) | Sung-Hyeon Lee ( National Academy of Agricultural Science, RDA, 249, Seodun-dong, Suwon, Republic of Korea )
• 이영민( 농촌진흥청 국립농업과학원 ) | Young-Min Lee ( National Academy of Agricultural Science, RDA, 249, Seodun-dong, Suwon, Republic of Korea )
• 장환희( 농촌진흥청 국립농업과학원 ) | Hwan-Hee Jang ( National Academy of Agricultural Science, RDA, 249, Seodun-dong, Suwon, Republic of Korea )
• 황경아( 농촌진흥청 국립농업과학원 ) | Kyung-A Hwang ( National Academy of Agricultural Science, RDA, 249, Seodun-dong, Suwon, Republic of Korea )
• 곽재균( 농촌진흥청 국립농업과학원 ) | Jae-Gyun Gwag ( National Academy of Agricultural Science, RDA, 249, Seodun-dong, Suwon, Republic of Korea )
• 고호철( 농촌진흥청 국립농업과학원 ) | Ho-Cheol Ko ( National Academy of Agricultural Science, RDA, 249, Seodun-dong, Suwon, Republic of Korea )
• 김정봉( 농촌진흥청 국립농업과학원 ) | Jung-Bong Kim ( National Academy of Agricultural Science, RDA, 249, Seodun-dong, Suwon, Republic of Korea ) Corresponding author
• 조진웅( College of Agricultural & Life Sciences, Chungnam National University, Deajoen, 305-764, Korea ) | Jin-Woong Cho ( National Academy of Agricultural Science, RDA, 249, Seodun-dong, Suwon, Republic of Korea ) Corresponding author