Food Science and Biotechnology

Korean Society of Food Science and Technology (한국식품과학회)
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Effects of Omija (Schizandra chinensis Baillon) Extract on the Physico-Chemical Properties of Nabakkimchi during Fermentation

  • Moon, Sung-Won (Department of Food Service and Preparation, Youngdong University) ;
  • Kim, Byong-Ki (Department of Food Engineering, Dankook University) ;
  • Jang, Myung-Sook (Department of Food Science and Nutrition, Dankook University)
  • Published : 2006.08.30
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Abstract

In order to improve the quality and preservation of nabakkimchi, omija was added as an ingredient to determine its effect on the physicochemical characteristics of kimchi during fermentation, as well as the optimum level of omija extract. Omija extract was prepared from omija seeds by extraction with water for 9 hr at room temperature in concentrations (w/v) of 0.5, 1.0, 1.5, and 2.0% for use as an ingredient in nabakkimchi. The physicochemical characteristics of nabakkimchi containing omija extract were analyzed during fermentation of the product for up to 25 days. Delayed fermentation was observed, particularly in the early stage of fermentation, and was dependent on the concentration of the omija extract, as shown by stabilization of pH decreases and increases in the total acidity. An increased concentration of omija extract also raised the initial total vitamin C content and the reducing sugar content, which both then stabilized thereafter. Delayed development of turbidity within the optimum fermentation period of 16 days, increased redness and total color difference, and an electron-donor effect were also promoted by the omija extract. However, the omija extract also triggered extra tannin production, which leads to an astringent taste, especially at the 1.5 and 2.0% treatment levels.

Keywords

References

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