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http://dx.doi.org/10.5352/JLS.2012.22.11.1477

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

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)
Publication Information
Journal of Life Science / v.22, no.11, 2012 , pp. 1477-1486 More about this Journal
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.
Keywords
Onion peel; small intestine villi; ethanol; anti-oxidation; body weight;
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