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Quality characteristics and antioxidant activity of onion peel extracts by extraction methods

추출방법에 따른 양파껍질 추출물의 품질특성 및 항산화활성 비교

  • Jeong, Da-Som (Department of Food Science and Technology, Catholic University of Daegu) ;
  • Back, Da-Ae (Department of Food Science and Technology, Catholic University of Daegu) ;
  • Kwon, Yu-Ri (Department of Food Science and Technology, Catholic University of Daegu) ;
  • Kwon, Gi-Man (Department of Food Science and Technology, Catholic University of Daegu) ;
  • Youn, Kwang-Sup (Department of Food Science and Technology, Catholic University of Daegu)
  • 정다솜 (대구가톨릭대학교 식품공학과) ;
  • 백다애 (대구가톨릭대학교 식품공학과) ;
  • 권유리 (대구가톨릭대학교 식품공학과) ;
  • 권기만 (대구가톨릭대학교 식품공학과) ;
  • 윤광섭 (대구가톨릭대학교 식품공학과)
  • Received : 2015.01.26
  • Accepted : 2015.04.13
  • Published : 2015.04.30

Abstract

This study was conducted to evaluate the antioxidant activities and the quality characteristics of 70% ethanol extracts from onion peels with different extraction methods (autoclave extraction, AE; low temperature high pressure extraction, LTPE; reflux extraction, RE; and stirrer extraction, SE). The yields of AE, LTPE, RE and SE were 9.00%, 5.39%, 13.21% and 12.41%, respectively. The total polyphenol and flavonoid contents in the AE were significantly higher than in the other extracts. The DPPH radical scavenging abilities with a concentration of 100 mg% (w/v) were : AE, 28.9%; RE, 26.07%; LTPE, 24.35%; and SE, 19.53%. The ABTS radical scavenging ability and the nitrite scavenging activity showed the same tendency as that of the DPPH radical scavenging ability. The angiotensin-converting enzyme (ACE) inhibitory activities of the LTPE and AE were higher than those of the RE and SE. The ${\alpha}$-Glucosidase inhibitory activity of the RE was higher than that of the extracts with other extraction methods. The nitrite scavenging activities with a concentration of 10 mg/mL were: AE. 33.97%; RE, 35.47%; LTPE, 21.86%; and SE, 21.71%. The ferrous ion chelating activity of the LTPE (54.73%) was significantly higher than that of the other extracts. These results suggest that AE is the superior method for the enhancement of anti-oxidant activity, and onion peel can be used as a natural antioxidant material for health foods and can be a good ingredient of functional foods.

추출방법에 따른 양파껍질 추출물의 품질 특성 및 생리 활성 특성을 비교하였다. 환류냉각추출의 수율이 13.21%로 가장 높았고, 폴리페놀과 플라보노이드 함량은 가압가열추출이 가장 높게 나타났다. DPPH 라디칼 소거능 및 ABTS 라디칼 소거능 또한 가압가열추출이 가장 높게 측정되었다. ${\alpha}$-Glucosidase 저해 효과는 80.24%로 환류냉각추출이 가장 높은 저해 효과를 나타내었고, ACE 저해 효과는 27.05%로 저온고압추출이 가장 높았다. 아질산염 소거활성은 가압가열추출이 33.97%로 가장 높았고 다음으로 환류 냉각추출이 32.47%로 높은 활성을 나타내었다. Ferrous ion chelating 효과에서는 저온고압추출이 54.73%로 가장 높은 활성을 나타내었다. 이러한 결과를 종합해 볼 때 가압가열 추출이 소재 활용가치가 높을 것으로 사료되며 천연 항산화제 및 기능성 증진을 위한 소재로 이용 가능할 것으로 판단된다.

Keywords

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