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Supplementation Effect of Onion Peel Extracts on Small Intestine of Obese Mice

양파껍질 추출물 급여가 비만 유도쥐의 소장내 변화에 미치는 영향

  • Pak, Jae-In (Department of Animal Products and Food Science, Kangwon National University) ;
  • Kim, Yoon-Woo (Department of Animal Products and Food Science, Kangwon National University) ;
  • Seo, Te-Su (Department of Animal Products and Food Science, Kangwon National University) ;
  • Jang, Aera (Department of Animal Products and Food Science, Kangwon National University)
  • 박재인 (강원대학교 동물식품응용과학과) ;
  • 김윤우 (강원대학교 동물식품응용과학과) ;
  • 서태수 (강원대학교 동물식품응용과학과) ;
  • 장애라 (강원대학교 동물식품응용과학과)
  • Received : 2012.08.12
  • Accepted : 2012.11.15
  • Published : 2012.11.30

Abstract

This study was performed to determine the effect of onion peel extract using 70% ethanol and 95% ethanol on its anti-oxidation activity, small intestine length, and intestinal villi of high-fat fed mice. Five percent of each onion peel extract using 70% and 95% ethanol showed significant decrease of E. coli and Listeria monocytogenes. Total phenolic contents of onion peel extracts using 70% and 95% ethanol were $166.89{\pm}0.03$ mg/g and $160.89{\pm}0.13$ mg/g, respectively. In anti-oxidation activity, DPPH radical scavenging activity and SOD-like activity of onion peel extracts were higher at 100 ug/ml concentration. The obese mice were fed high-fat diets supplemented by 1, 3, and 5% of the onion peel extracts using 70% and 95% ethanol for 4 weeks. Body weight, feed intake, feed efficiency, small intestine weight, length, villi's length, and number of bacteria in intestine were determined. Body weight of mice fed 5% of onion extracts using both 70% and 95% ethanol was significantly lower than that of control (p<0.05). However, feed intake was increased in mice fed 5% of onion extracts at both fermented ethanol levels. Small intestine weight and length of mice showed no significant change with supplementation of the onion peel extracts. However, length of small intestine villi was significantly longer than that of control. Total bacteria counts of Cl. Perfringenes and E. coli in small intestine of the mice were significantly reduced by supplementation of 5% of onion extract using ethanol, while lactic acid bacteria were increased. These results suggest that 5% of onion peel extracts using ethanol at either 70% or 95% concentration have potential to be used as an additive for body weight control and enhanced gut health; however, more research on its effectiveness is needed.

본 연구는 양파껍질을 발효주정 에탄올 70%와 95% 농도로 추출하여 항균활성, 항산화활성 및 비만쥐의 소화기관에 미치는 영향에 대하여 알아보고자 실시하였다. 각 주정 추출물 5%는 E. coli와 Listeria monocytogens에서 유의적인 감소를 나타내었다. 각 주정 추출물 내 총 페놀함량은 각각 $166.89{\pm}0.03$ mg/g과 $160.89{\pm}0.13$ mg/g을 나타내었다. 항산화효과를 살펴본 결과 DPPH 라디칼 소거능과 SOD 유사 활성은 100 ug/ml의 농도에서 높은 수준을 나타내었다. 고지방식이를 급여하여 유도한 비만을 유도한 마우스에 70%와 95% 주정으로 추출한 양파껍질 추출물을 1, 3, 5%의 농도로 4주간 급여한 후 체중, 사료섭취량, 사료효율, 소장무게, 길이 장내 융모의 길이, 소장 내 미생물수를 측정하였다. 각 주정으로 추출한 양파 추출물 5%의 농도로 급여하였을 때 대조군에 비해 체중이 유의적으로 낮은 수준을 나타내었으나(p<0.05) 사료섭취량은 증가함을 나타내었다. 실험동물 마우스 소장의 무게와 길이는 양파 껍질추출물 급여에 따른 유의적인 변화는 보이지 않았으나 소장 융모의 길이는 대조군보다 유의적으로 증가함을 나타내었다. 총균수, Cl.perfringenes와 E.coli는 5%의 농도로 양파껍질 주정 추출물을 처리했을 때 유의적으로 감소함을 나타내었으나 젖산균은 증가함을 나타내었다. 이러한 결과는 추후 부가적인 추가 연구가 필요하겠지만 70%와 95%의 주정으로 추출한 양파껍질 추출물을 5% 수준으로 이용하면 체중조절 첨가제로서 그리고 장의 건강을 증진시키기 위한 첨가제로 사용할 수 있는 잠재성이 있는 것으로 기대된다.

Keywords

References

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