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http://dx.doi.org/10.3746/jkfn.2012.41.3.320

Antibacterial and Antioxidative Activity of Roasted Coffee and Red Ginseng Mixture Extracts  

Choi, Yu-Hyun (Dept. of Technical Research Center, Heechang Dairy Food Co. Ltd.)
Kim, Sang-Eun (Dept. of Technical Research Center, Heechang Dairy Food Co. Ltd.)
Huh, Jin (The Division of Bio Science, Dongguk University)
Han, Yeong-Hwan (The Division of Bio Science, Dongguk University)
Lee, Moon-Jo (Dept. of Technical Research Center, Heechang Dairy Food Co. Ltd.)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.41, no.3, 2012 , pp. 320-326 More about this Journal
Abstract
This study was conducted to investigate the antibacterial and antioxidative activities of water and ethanol extracts from a mixture of roasted coffee and red ginseng. The antibacterial effects of each extract were determined by the classical paper disc method. A water extract of mixture samples inhibited growth of all strains, but antibacterial effects were mostly weakened. Ethanol extracts showed stronger antibacterial effects than water extracts in all strains except Gram negative Escherichia coli and the fungi strain Candida albicans. Also, the antibacterial effect of the Bacillus cereus strain appeared in all samples, and the ES2 sample formed a clear zone of 19 and 20 mm against Pseudomonas aeruginosa and S. Typhimurium respectively (MIC=0.25 and 0.125 mg/mL). Determinations of free radical elimination for the different mixture extracts using 1,1-diphenyl-2-picrylhydrazyl (DPPH) were compared with ascorbic acid and butylated hyderoxytoluene as positive controls. The water and ethanol extracts of mixture samples (100 ${\mu}g/mL$) showed 55.38~60.01% and 59.37~70.50% DPPH scavenging activities, respectively. DPPH scavenging activities of all mixture samples were slightly higher than roasted coffee and red ginseng samples. However, DPPH scavenging activity decreased when red ginseng extract composed more than 70% of the total extract. The total polyphenol in the mixture samples measured by the Folin-Denis method revealed the highest level of polyphenol content in ethanol extract of sample 3, whereas polyphenol content differed with different mixture ratios, ranging from 105.16~119.79 mg/g in ethanol extract. In the water extract, the polyphenol content was greatest with water extract of sample 1, whereas in other samples the content varied from 93.75~109.18 mg/g.
Keywords
roasted coffee; red ginseng; antibacterial; antioxidative; polyphenol content;
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Times Cited By KSCI : 11  (Citation Analysis)
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