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Quality Characteristics and Antioxidant Activity of Spirulina added Yogurt  

Shin, Yu-Mi (Department of Food and Nutrition, Chungnam National University)
Son, Chan-Wok (Department of Food and Nutrition, Chungnam National University)
Sim, Hyun-Jung (Department of Food and Nutrition, Chungnam National University)
Kim, Min-Hee (Department of Food and Nutrition, Chungnam National University)
Kim, Mi-Yeon (Department of Food and Nutrition, Chungnam National University)
Kwon, Oh-Yun (Department of Food and Nutrition, Chungnam National University)
Kim, Mee-Ree (Department of Food and Nutrition, Chungnam National University)
Publication Information
Korean journal of food and cookery science / v.24, no.1, 2008 , pp. 68-75 More about this Journal
Abstract
The aim of this study was to evaluate the quality characteristics and antioxidant activity of yogurt containing spirulina. Yogurt base was prepared from skim milk added with $0.25{\sim}1%(w/v)$ spirulina powder and fermented with lactic acid bacteria (S. thermophilus : L. bulgaricus = 1 : 1) at $40^{\circ}C$ for 12 hr. Kiwi puree and oligosaccharides were then added. The addition of 1% spirulina powder stimulated the growth of lactic acid bacteria, which showed the highest viable cell count ($3.4{\times}10^9$ CFU/mL), and increased the titratable acidity (1.10%). The viscosity range of the yogurt was 6,000 to 9,000 cP, and the sugar content of the yogurt was around 18 $^{\circ}Brix$. The antioxidant activities were determined using the DPPH method, and the hydroxyl radical scavenging activity of the yogurt containing spirulina was higher than that of the control. The sensory evaluation scores for appearance, odor, taste, overall acceptability and buying intention were higher in the yogurt containing 0.25% spirulina than in the other groups. The amount of macronutrients in the yogurt containing spirulina was higher than that in the control. In addition, the amounts of micronutrients in the yogurt containing spirulina was significantly increased. According to these results, the optimum concentration of spirulina powder is around 0.25%.
Keywords
Yogurt; spirulina; quality; antioxidant activity;
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Times Cited By KSCI : 5  (Citation Analysis)
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