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http://dx.doi.org/10.4163/jnh.2013.46.5.401

Study on antioxidative, antidiabetic and antiobesity activity of solvent fractions of smilax china L. leaf extract  

Kang, Yun Hwan (Well-being Bioproducts RIC, Kangwon National University)
Lee, Young-Sil (Center for Nutraceutical and Pharmaceutical Materials, Myongji University)
Kim, Kyoung Kon (Department of Bio-Health Technology, Kangwon National University)
Kim, Dae Jung (Well-being Bioproducts RIC, Kangwon National University)
Kim, Tae Woo (Well-being Bioproducts RIC, Kangwon National University)
Choe, Myeon (Well-being Bioproducts RIC, Kangwon National University)
Publication Information
Journal of Nutrition and Health / v.46, no.5, 2013 , pp. 401-409 More about this Journal
Abstract
Smilax china L., a native plant found in Asian countries, has several medicinal properties including antioxidant, anti-inflammatory, and anti-cancer effects. Although the root of the plant is commonly used as traditional herbal medicine in Korea and China, the medicinal properties of the leaves have not gained the same attention. In this study, we analyzed the antioxidant activity, ${\alpha}$-glucosidase inhibitory effect and lipid accumulation inhibition effect of Smilax china L. leaf water extract (SCLE) and its solvent fractions. SCLE was fractionated by using a series of organic solvents, including ethylacetate (EA) and n-butanol (BuOH). The EA fraction had the highest total polyphenol content ($440.20{\pm}12.67$ mg GAE/g) and total flavonoid content ($215.14{\pm}24.83$ mg QE/g). The radical scavenging activity $IC_{50}$ values of the EA fraction for 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2-azino-bis-(3-ethylbenzthiazoline)-6-sulfonic acid (ABTS) were 0.022 mg/mL and 0.13 mg/mL, respectively. Further, SOD-like activity and reducing power values of the EA fraction were higher than those of the other fractions. However, both the ${\alpha}$-glucosidase and lipid accumulation inhibition assays showed that the BuOH fraction ($83.35{\pm}4.18%$ at 1 mg/mL) and water extract ($11.27{\pm}2.67%$) were more effective than the EA fraction ($64.13{\pm}6.35%$, and $45.66{\pm}7.20%$). These results provide new insights into the potential anti-diabetic and anti-obesity effects of Smilax china L. leaf.
Keywords
Smilax china L; anti-diabetic activity; anti-obesity activity; antioxidant; organic solvent fraction;
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