Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Comparison of Gingerols in Various Fractions and the Antioxidant Effects of Supercritical Fluid Extracts from Ginger

생강 분획의 gingerols 분석 및 초임계 추출물의 항산화 효과

  • Lee, Eun-Ju (Department of Food Science and Technology, Keimyung University) ;
  • Yang, Seun-Ah (The Center for Traditional Microorganism Resources, Keimyung University) ;
  • Choi, Hee-Don (Korea Food Research Institute) ;
  • Im, Hyo-Gwon (Daegu Technopark Bio Industry Center) ;
  • Whang, Key (Department of Food Science and Technology, Keimyung University) ;
  • Lee, In-Seon (Department of Food Science and Technology, Keimyung University)
  • 이은주 (계명대학교 식품가공학) ;
  • 양선아 (계명대학교 전통미생물자원개발 및 산업화연구(TMR) 센터) ;
  • 최희돈 (한국식품연구원) ;
  • 임효권 (대구 테크노파크 바이오산업지원센터) ;
  • 황기 (계명대학교 식품가공학) ;
  • 이인선 (계명대학교 식품가공학)
  • Received : 2011.03.11
  • Accepted : 2011.04.25
  • Published : 2011.08.31
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Abstract

Ginger (Zingiber officinale Rosc.) is a well known edible plant that is traditionally used to treat various illnesses related to inflammation and oxidative stress. Steam distillated ginger oil or water extract are mainly used for related products; however, it is unclear whether these fractions contain most of the bioactive compounds or the highest efficacy. This investigated the antioxidant effects of extracts prepared by supercritical fluid extraction (SFE). 6-Gingerol was the most abundant component in hexane fraction of ethanol extract from ginger. The antioxidative properties of SFE oil and Marc ethanol fractions were demonstrated using the 2,20-diphenylpicrylhydrazyl (DPPH) and 2,2'-azinobis 3-ethyl benzothiazoline-6-sulfonic acid (ABTS) radicals scavenging assays. A clear correlation was observed between total polyphenol contents and $RC_{50}$ values in the Marc ethanol fraction. These results indicate that not only SFE oil but the marc after SFE could be good sources for the food industry.

본 실험에서는 생강 에탄올 추출물의 극성에 따른 용매 분획을 실시하여 생강의 유용성분을 분석하였으며, 초임계 추출 장치를 이용하여 oil을 추출한 후 남은 박을 다시 에탄올로 추출하여 각각의 총 폴리페놀 및 플라보노이드의 함량과 DPPH, ABTS radical 소거활성을 측정하여 항산화 활성을 비교 검색하였다. 알려진 생강의 유용성분 중 6-gingerol의 함량이 가장 높았으며, n-hexane층에 약 25% 존재하여 6-shogaol 보다 7배 이상 높은 것을 확인했다. 항산화 성분 측정 결과, 생강 박 에탄올 추출물의 총 플라보노이드 함량이 생강 에탄올 추출물보다 높은 경향을 나타내어 생강의 오일 추출 후에 플라보노이드 성분의 용출이 용이해 졌음을 알 수 있었다. DPPH와 ABTS 라디컬 소거능은 초임계 오일에서 높았으며 특히, 45$^{\circ}C$ 이상의 온도 및 200 bar 이상의 조건에서 추출한 오일에서 우수한 소거활성을 나타냈다. 또한, 오일뿐 아니라 박 에탄올 추출물은 온도와 관계없이 압력 100 bar에서 항산화능이 우수하였으며 특히, 55$^{\circ}C$, 100 bar에서 20.17${\pm}$0.83 ${\mu}g/mL$로 강한 소거활성을 확인할 수 있었다. 이는 초임계 오일은 고온, 고압에서 추출 시 많은 양의 항산화 성분이 용출되며, 박 추출물의 경우에는 낮은 압력에서 얻은 박에 많은 양의 항산화 성분이 존재하는 것을 알 수 있다. 이러한 결과로부터, 초임계 추출법이 항산화 성분 추출에 보다 효율적인 방법이며, 생강 특유의 향과 고농도의 6-gingerol을 함유하는 초임계 오일뿐만 아니라 향 성분이 제거된 박 추출물도 높은 항산화 효과를 나타내는 기능성 천연 소재로의 활용이 가능할 것으로 사료되며 향후 다양한 산업적 활용이 기대된다.

Keywords

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