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Flavonoids composition and antioxidant activity of by-products of five orange cultivars during maturation

수확시기별 오렌지 5품종 부산물의 플라보노이드 함량과 항산화 활성

  • An, Hyun Joo (Citrus Research Institute, National Institute of Horticultural and Herbal Science, RDA) ;
  • Park, Kyung Jin (Citrus Research Institute, National Institute of Horticultural and Herbal Science, RDA) ;
  • Kim, Sang Suk (Citrus Research Institute, National Institute of Horticultural and Herbal Science, RDA)
  • 안현주 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 박경진 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 김상숙 (농촌진흥청 국립원예특작과학원 감귤연구소)
  • Received : 2016.10.25
  • Accepted : 2016.11.22
  • Published : 2016.12.30

Abstract

This study was conducted to investigate total flavonoid content, flavonoid composition, and free radical scavenging effects of by-products from five orange cultivars during the period September 2015 to February 2016. Total flavonoid content was highest in peel extracts from immature fruit harvested in September. Total flavonoid contents of all cultivars mostly decreased while ripening. Among the five cultivars, total flavonoid content was highest in Hamlin sweet orange (21.66 mg/g), followed by Sanguinello blood orange (20.39 mg/g), Shamouti orange (18.49 mg/g), Tarocco blood orange (18.46 mg/g), and Olinda Valencia orange (17.07 mg/g). With regard to flavonoid composition, all cultivar materials had high levels of narirutin and hesperidin, but naringin and neohesperidin were not detected in any of the materials. Nobiletin, as polymethoxyflavone, was detected within a$23{\sim}40{\mu}g/mL$ range in the immature fruit of all cultivars. Among all cultivars, antioxidant activities were higher in peel extracts than in pulp extracts. DPPH radical scavenging activities of peel extracts ranged from 40% to 58% while the ABTS radical scavenging activity range was 90~94%. The results indicate that orange, by-products, especially peel of immature orange fruit, could have application as natural materials with antioxidative effects.

오렌지 생과 및 가공용으로 주로 사용되는 주요 5가지 오렌지 품종의 과피 및 착즙을 하고 난 부산물의 플라보노이드 성분과 유리 라디칼 소거활성을 성숙시기별로 분석하여 오렌지 부산물의 천연물 유래 기능성 소재로써의 활용 가능성을 검토하고자 본 연구를 수행하였다. 성숙시기에 따른 총 플라보노이드 함량은 모든 시료에서 성숙이 진행된 과일 보다 미성숙 상태의 과일인 9월에 수확한 과일에 함량이 가장 높은 것으로 나타났으며, 성숙이 진행될수록 감소하는 경향을 보였다. 품종간에는 과피 추출물의 경우 Hamlin(21.66 mg/g) > Sanguinello blood(20.39 mg/g) > Shamouti(18.49 mg/g), Tarocco blood(18.46 mg/g) > Olinda valencia(17.07 mg/g) 순으로 조사되었다. 플라보노이드 성분 변화에서는 모든 시료에 narirutin과 hesperidind의 함량이 높았으며, naringin과 neohesperidin은 검출되지 않았다. PMF 성분 중에는 9월에 수확한 미성숙과의 과피 추출물에 nobiletin이 $23{\sim}40{\mu}g/mL$ 함유되어 있음을 확인할 수 있었다. 유리 라디칼 소거활성에서는 모든 품종에서 과피 추출물이 과육 추출물에 비해 우수하였고, 과피 추출물의 DPPH 라디칼 소거활성은 40~58%, ABTS 라디칼 소거활성에서는 90~94%의 소거능을 보였다.

Keywords

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