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http://dx.doi.org/10.4162/nrp.2014.8.6.638

Antioxidative effects of Kimchi under different fermentation stage on radical-induced oxidative stress  

Kim, Boh Kyung (Department of Food Science and Nutrition and Kimchi Research Institute, Pusan National University)
Choi, Ji Myung (Department of Food Science and Nutrition and Kimchi Research Institute, Pusan National University)
Kang, Soon Ah (Department of Conversing Technology, Graduate School of Venture, Hoseo University)
Park, Kun Young (Department of Food Science and Nutrition and Kimchi Research Institute, Pusan National University)
Cho, Eun Ju (Department of Food Science and Nutrition and Kimchi Research Institute, Pusan National University)
Publication Information
Nutrition Research and Practice / v.8, no.6, 2014 , pp. 638-643 More about this Journal
Abstract
BACKGROUND/OBJECTIVES: Kimchi is a traditional Korean fermented vegetable containing several ingredients. We investigated the protective activity of methanol extract of kimchi under different fermentation stages against oxidative damage. MATERIALS/METHODS: Fresh kimchi (Fresh), optimally ripened kimchi (OptR), and over ripened kimchi (OvR) were fermented until the pH reached pH 5.6, pH 4.3, and pH 3.8, respectively. The radical scavenging activity and protective activity from oxidative stress of kimchi during fermentation were investigated under in vitro and cellular systems using LLC-$PK_1$ cells. RESULTS: Kimchi exhibited strong radical scavenging activities against 1,1-diphenyl-2-picrylhydrazyl, nitric oxide, superoxide anion, and hydroxyl radical. In addition, the free radical generators led to loss of cell viability and elevated lipid peroxidation, while treatment with kimchi resulted in significantly increased cell viability and decreased lipid peroxidation. Furthermore, the protective effect against oxidative stress was related to regulation of cyclooxygenase-2, inducible nitric oxide synthase, nuclear factor-${\kappa}B$ p65, and $I{\kappa}B$ expression. In particular, OvR showed the strongest protective effect from cellular oxidative stress among other kimchi. CONCLUSION: The current study indicated that kimchi, particularly OptR and OvR, played a protective role against free radical-induced oxidative stress. These findings suggest that kimchi is a promising functional food with an antioxidative effect and fermentation of kimchi led to elevation of antioxidative activity.
Keywords
Kimchi; fermentation; oxidative stress; nitrosative stress; free radical;
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