Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Effect of germination and temperature on the antioxidant activity of coffee

발아 및 발아온도가 커피의 산화방지 활성에 미치는 영향

  • 임예서 (서울우유 협동조합 중앙연구소) ;
  • 신용국 (서울우유 협동조합 중앙연구소) ;
  • 김도완 (서울우유 협동조합 중앙연구소)
  • Received : 2018.01.23
  • Accepted : 2018.03.12
  • Published : 2018.04.30
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Abstract

The present study aimed to investigate the effect of germination and temperature on the antioxidant activity of coffee. Green beans were germinated at 20 and $40^{\circ}C$. Germinated green beans were dried and roasted. Ground coffee was brewed at $90^{\circ}C$ for 5 min. Coffee samples were analyzed for antioxidant compounds and for its antioxidant activity. The total polyphenol content (TPC) and total flavonoid content (TFC) in coffee brewed with coffee beans germinated at $20^{\circ}C$ (CG20) were significantly higher than those in coffee brewed with non-germinated coffee beans (CNG). The same tendency was observed on 2,2-diphenyl-1-picrylhydrazyl and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) radical scavenging assays. TPC and TFC of coffee brewed with germinated coffee beans decreased with an increase in germination temperature from 20 to $40^{\circ}C$. In conclusion, germination of coffee beans contributes to an increase in its antioxidant activity. However, setting the appropriate temperature for germination is an important factor in determining the antioxidant activity of coffee.

커피 생두의 발아 유무와 발아온도에 따른 커피 내 산화방지물질과 산화방지 활성 변화에 대해 살펴보았다. $20^{\circ}C$ 발아 커피는 미발아 커피에 비해 총 폴리페놀과 플라보노이드 함량이 높았고, DPPH와 ABTS 제거능 또한 높게 나타났다. $40^{\circ}C$ 발아 커피는 $20^{\circ}C$ 발아커피에 비해 총 폴리페놀과 플라보노이드 함량이 유의적으로 낮았다. 특히, $40^{\circ}C$ 발아 커피는 미발아 커피와 비교했을 때에도 총 폴리페놀 함량이 낮은 것을 확인할 수 있었다. 커피 내 플라보노이드 함량과 산화방지 활성은 강한 양의 상관관계를 보였으나, 총 폴리페놀 함량은 산화방지 활성과 낮은 상관관계를 보였다. 이는 미발아 커피에 비해 $40^{\circ}C$ 발아 커피에서 총 폴리페놀 함량이 유의적으로 감소했음에도 불구하고, DPPH 제거능은 유의적으로 증가하였고, ABTS 제거능은 유의적 차이를 보이지 않은 것과 연관된다. 이상의 결과를 종합해보면, 커피 생두의 발아는 커피 내 산화방지 물질과 산화방지 활성을 높이며, 적절한 발아온도의 설정은 이러한 커피의 생리활성을 극대화할 수 있는 중요한 요소라 할 수 있다.

Keywords

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