Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Effect of Drying and Extraction Methods on Antioxidant Activity of Gnaphalium affine D. DON

건조 및 추출 방법을 달리한 떡쑥(Gnaphalium affine D. DON)의 항산화 효과에 대한 연구

  • Kim, Hye-Jin (Department of Food and Nutrition, Kwangju Women's University) ;
  • Park, Byung-Geon (Department of Food and Nutrition, Kwangju Women's University) ;
  • Han, Inhwa (Department of Food and Nutrition, Kwangju Women's University)
  • 김혜진 (광주여자대학교 식품영양학과) ;
  • 박병건 (광주여자대학교 식품영양학과) ;
  • 한인화 (광주여자대학교 식품영양학과)
  • Received : 2015.01.21
  • Accepted : 2015.03.12
  • Published : 2015.05.31
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Abstract

This study was conducted to evaluate the effects of drying and extraction methods on antioxidant activity and total phenol content of Gnaphalium affine D. DON (GA). Hot-air, shade-drying, and freeze-drying were used for drying, after which magnetic stirring and ultrasonification were applied. Extracting solvents were water, 80% ethanol, and 80% methanol. Total phenol content was highest in 80% ethanol extract of freeze-dried and stirred GA. Total flavonoid content was highest in 80% methanol extract of freeze-dried and stirred GA. 2,2-Diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity was higher in 80% methanol and 80% ethanol extracts than in water extract. 2,2-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging activity was highest in 80% ethanol extract of shade-dried and ultrasonicated GA. Reducing power was generally higher in 80% methanol extract than in 80% ethanol and water extracts of GA. Total phenol and total flavonoid contents were highly correlated with DPPH radical scavenging activity and reducing power, respectively. This result implies that the antioxidant activity of GA can be attributed to phenol compounds such as flavonoids. Conclusively, phenol compounds such as flavonoids are responsible for the antioxidant activity of GA, and there was no significant effect of drying and stirring conditions on antioxidant activity of 80% ethanol. Meanwhile, DPPH radical scavenging activity of water extract and reducing power of 80% methanol extract were higher in hot-air and shade-dried GAs than in freeze-dried GA.

본 연구는 떡쑥을 동결건조, 음지건조, 열풍건조 후 상온교반과 초음파를 각각 적용하며 물, 80% 메탄올, 80% 에탄올로 추출한 떡쑥 추출물의 항산화 효과를 각 건조 방법 및 추출 조건에 따라 비교하였다. 총 페놀 물질 함량에서는 동결건조 상온교반 80% 에탄올 추출물(13.87 mg QE/g)이 가장 많은 양을 나타냈다. 총 플라보노이드 함량에서는 음지건조 상온교반 80% 메탄올 추출물(12.78 mg QE/g)이 가장 높은 총 플라보노이드 함량을 나타내었다. DPPH radical 소거능에 있어서는 건조 방법 및 교반 조건에 따라서 DPPH radical 소거능에 유의적인 차이가 나타나지 않았으나 80% 에탄올과 80% 메탄올 추출물이 물 추출물보다 유의적으로 높은 소거능을 나타냈다. 환원력은 음지건조 초음파 80% 메탄올 추출물($225.5g{\mu}g$ TERP/g)에서 가장 높게 나타났으며 동결건조 초음파 물 추출물($22.2{\mu}g$ TERP/g)에서 가장 낮게 나타났다. 떡쑥의 환원력에서는 용매에 따라 80% 메탄올, 80% 에탄올, 증류수 순으로 유의적인 차이를 나타내었다. 떡쑥 추출물의 항산화 성분과 항산화능과의 상관관계에 있어서는 DPPH radical 소거능과 환원력에 유의적인 상관관계를 나타냈다. 결과적으로 떡쑥의 DPPH radical 소거 활성과 환원력은 플라보노이드를 포함한 페놀물질로부터 기인하며 떡쑥은 물보다 80% 에탄올과 80% 메탄올이 항산화 물질 추출에 더 효율적인 것으로 나타났다. 80% 에탄올 추출물의 모든 항산화 효과는 건조 및 교반 조건에 유의적인 차이를 보이지 않았으나 물 추출물의 DPPH radical 소거 활성과 80% 메탄올 추출물의 환원력은 열풍건조와 음지건조 처리 시 동결건조보다 높게 나타났다.

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