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Effects of the Fermentation Periods on the Qualities and Functionalities of the Fermentation Broth of Wild Vegetables  

Kim, Na-Mi (KT&G Central Research Institute, Ginseng Research Group)
Lee, Jong-Won (KT&G Central Research Institute, Ginseng Research Group)
Do, Jae-Ho (KT&G Central Research Institute, Ginseng Research Group)
Yang, Jae-Won (KT&G Central Research Institute, Ginseng Research Group)
Publication Information
Korean Journal of Food Science and Technology / v.35, no.2, 2003 , pp. 272-279 More about this Journal
Abstract
To determine optimal fermentation period of wild vegetables mixed with black sugar without microorganisms during plant extract fermentation food processing, changes in chemical components, quality characteristics of the fermented broth, and physiological functionality during fermentation period were investigated. pH and $^{\circ}Bx$ of fermented broths decreased gradually during fermentation period. Except persimmon leaf, viscosity of fermented broths of wild vegetables decreased after 3 months fermentation period. Amylase activity increased to $167{\sim}800%$ of its initial level after 6 months fermentation period, and invertase activity decreased by $60{\sim}170$ units after 1 month fermentation. No significant level of cellulase activity was observed. In the sensory evaluation test, inherent flavors and tastes of the wild vegetable decreased during the fermentation period, while those of others gradually increased. Overall acceptability was the highest after 3 months fermentation. Content of total phenolic compounds and electron-donating ability were highest after 3 to 4 months fermentation period, and decreased thereafter. Except Mugwort, tyrosinase inhibitory activity was found in all fermented broths. SOD-like activities were $23.0{\sim}25.1$ and $27.0{\sim}29.2%$ in fermentation broths of acacia flower and persimmon leaf, respectively, and were maintained throughout the fermentation period. Based on these results, fermentation period of 3 to 4 months was determined to be appropriate for plant extract fermentation food processing.
Keywords
fermentation; wild vegetables; qualities; functionalities;
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