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Preparation and Quality Characteristics of Yogurt Added with Cultured Ginseng  

Lee, In-Seon (The Center for Traditional Microorganism Resources, Keimyung University)
Paek, Kee-Yoeup (Research Center for the Development of Advanced Horticultural technology, Chungbuk National University)
Publication Information
Korean Journal of Food Science and Technology / v.35, no.2, 2003 , pp. 235-241 More about this Journal
Abstract
Yogurt base was prepared from whole and skin milk added with $0.5{\sim}2.0%\;(w/v)$ of cultured ginseng ethanol extract and fermented with lactic acid bacteria (Streptococcos thermophilus : Lactobacillus bulgaricus=1:1) at $37^{\circ}C$ for $24{\sim}30\;h$. Quality characteristics of the yogurt were evaluated in terms of acid production, number of viable cells, viscosity, and sensory property during lactic acid fermentation. Total contents of amino acids and some organic acids were analyzed. Addition of cultured ginseng extract stimulated the growth of lactic acid bacteria, and enhanced acid production and viscosity of yogurt. Total contents of amino acids of 0.5% cultured ginseng-added yogurt were higher than control group before fermentation, whereas glutamic acid, cysteine, valine, and phenyalaine contents increased after 30 h incubation. Contents of lactic, citric, and formic acids of 0.5% cultured ginseng-added yogurt increased during fermentation for 24 h. whereas decreased thereafter. Sensory scores of yogurts added with 0.5 and 1 % cultured ginseng extract were significantly higher than other groups in taste and overall acceptability. When cultured ginseng yogurt was kept at $5^{\circ}C$ for 15 days, its quality-keeping property was relatively good.
Keywords
yogurt; cultured ginseng; lactic acid bacteria;
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