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http://dx.doi.org/10.3746/jkfn.2006.35.9.1133

Antioxidant Activity of Extracts from Smilax china Root  

Song, Hee-Sun (Dept. of Food & Nutrition, Kwangju Health College)
Park, Yeon-Hee (Dept. of Food & Nutrition, Kwangju Health College)
Jung, Sae-Heung (Clinical Pathology, and Bioindustry & Technology Research Institute, Kwangju Health College)
Kim, Dong-Pil (Dept. of Food & Nutrition, Kwangju Health College)
Jung, Yong-Hee (Dept. of Food & Nutrition, Kwangju Health College)
Lee, Mi-Kyung (Dept. of Food & Nutrition, Kwangju Health College)
Moon, Ki-Young (Clinical Pathology, and Bioindustry & Technology Research Institute, Kwangju Health College)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.35, no.9, 2006 , pp. 1133-1138 More about this Journal
Abstract
Smilax china root has been used as traditional medicinal remedy in China and Korea and reported to have various biological activities such as anti-inflammatory, antimutagenic and antimicrobial activities. In this study, the possibility of development as natural antioxidants of Smilax china root extracts was investigated. For the evaluation of antioxidant activity, aqueous- and 25% EtOH extract from Smilax china root were prepared and six different evaluation assay methods, i.e., measurement of total phenolics, radical scavenging effects on 1,1-diphenyl-2-picrylhydrazyl (DPPH), nitric oxide (NO) and nitrite $(NO_2)$, reducing power, and inhibitory effect on tyrosinase activity, were used. The total phenolics content of two extracts was high as the level of 36 mg of gallic acid equivalent per 1 g of dried sample tested. The radical scavenging activities of ethanol extract toward DPPH and NO were better than those of aqueous extract (p<0.05). The $NO_2$ scavenging activity of both extracts showed the highest value at pH 1.2 (98%). Especially, the $NO_2$ scavenging activities of EtOH extract were significantly stronger than those of aqueous one at pH 4.2 (51%) and pH 6.0 (32%), respectively. In the reducing power test, both extracts revealed higher ferric ion reducing activity than known antioxidant, vitamin C at the level of $0.05\sim0.1mg/mL$ (p<0.01). The 1 mL of aqueous and 25% EtOH extract showed effective inhibition activity on tyrosinase activity as 45% and 53%, respectively. Therefore, these results suggest that two extracts from Smilax china root may serve as useful natural antioxidants.
Keywords
Smilax china root; antioxidant; total phenolics; radical scavenging activity; reducing power; tyrosinase activity;
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