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Preparation and Characteristics of Drinkable Yoghurt Added Water Extract of Omija(Schizandra chinensis Baillon)  

홍경현 (경원대학교 식품영양학과)
남은숙 (경원대학교 식품영양학)
박신인 (경원대학교 식품영양학과)
Publication Information
The Korean Journal of Food And Nutrition / v.17, no.2, 2004 , pp. 111-119 More about this Journal
Abstract
A new type of drinkable yoghurt was prepared to develop a functional yoghurt. Skim milk containing 0.4-1.0%(w/v) water extract of omija(Schizandra chinensis Baillon) was fermented by the mixed strains of Lactobacillus acidophilus and Streptococcus thermophilus. Quality characteristics of the drinkable yoghurts were evaluated in terms of compositions, keeping-quality(pH, titratable acidity, number of viable cells) and sensory properties. The drinkable yoghurts added with water extract of Schizandra chinensis were composed of 2.92-3.03% protein, 9.98-10.23% lactose, 0.81-1.08% fat, 16.21-16.64% total solid, and 14.57-15.17% solid-not-fat. The L values(brightness) were significantly lower in the yoghurts containing water extract of Schizandra chinensis than that of the control which had no water extract of Schizandra chinensis, while the a values(redness) and b values(yellowness) were significantly higher than those of the control. The pH, titratable acidity and number of viable cells of the lactic acid bacteria of all yoghurts were not changed during the storage at 4$^{\circ}C$ for 15 days, while the pH and titratable acidity were remarkedly changed during the yoghurts stored at 20$^{\circ}C$ for 15 days. The drinkable yoghurts containing 0.4%(w/v) water extract of Schizandra chinensis added 15%(w/v) oligosaccharide, or 0.6%(w/v) water extract of Schizandra chinensis added 20%(w/v) oligosaccharide had the highest sensory score in taste and overall acceptability among the treatments. From the results, Schizandra chinensis was a useful natural additive with the bioactive effect by provision of a acceptable physicochemical and sensory properties in the drinkable yoghurt.
Keywords
omija(Schizandra chinensis Baillon); drinkable yoghurt; keeping-quality property; sensory evaluation;
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Times Cited By KSCI : 3  (Citation Analysis)
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