Enhanced Microbial, Functional and Sensory Properties of ... · Jae Yeon Joung1†, Ji Young Lee1†, Young Sik Ha1, Yong Kook Shin1, Younghoon Kim2, Sae Hun Kim3, and Nam Su Oh1*
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Korean J. Food Sci. An. Vol. 36, No. 1, pp. 90~99(2016)
Enhanced Microbial, Functional and Sensory Properties of
Herbal Yogurt Fermented with Korean Traditional Plant Extracts
Jae Yeon Joung1†, Ji Young Lee1†, Young Sik Ha1, Yong Kook Shin1, Younghoon Kim2,
Sae Hun Kim3, and Nam Su Oh1*1R&D Center, Seoul Dairy Cooperative, Ansan 15407, Korea
2Department of Animal Science and Institute of Rare Earth for Biological Application,
Chonbuk National University, Jeonju 54896, Korea3Division of Food Bioscience and Technology, College of Life Science & Biotechnology,
Korea University, Seoul 02841, Korea
Abstract
This study evaluated the effects of two Korean traditional plant extracts (Diospyros kaki THUNB. leaf; DK, and Nelumbo nucifera
leaf; NN) on the fermentation, functional and sensory properties of herbal yogurts. Compared to control fermentation, all plant extractsincreased acidification rate and reduced the time to complete fermentation (pH 4.5). Supplementation of plant extracts and storage timewere found to influence the characteristics of the yogurts, contributing to increased viability of starter culture and phenolic compounds.In particular, the increase in the counts of Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus was highest (2.95and 1.14 Log CFU/mL respectively) in DK yogurt. Furthermore, supplementation of the plant extracts significantly influenced to increasethe antioxidant activity and water holding capacity and to produce volatile compounds. The higher antioxidant activity and water hold-ing capacity were observed in NN yogurt than DK yogurt. Moreover, all of the sensory characteristics were altered by the addition ofplant extracts. Addition of plant extracts increased the scores related to flavor, taste, and texture from plain yogurt without a plant extract,as a result of volatile compounds analysis. Thus, the overall preference was increased by plant extracts. Consequently, supplementationof DK and NN extracts in yogurt enhanced the antioxidant activity and physical property, moreover increased the acceptability of yogurt.These findings demonstrate the possibility of using plant extracts as a functional ingredient in the manufacture of herbal yogurt.
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