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Effect of Mulberry Extract on the Growth of Yogurt Starter Cultures  

Suh Hyung-Joo (Department of Food and Nutrition, Korea University)
Kim Young-Soon (Department of Food and Nutrition, Korea University)
Kim Jin-Man (Department of Food Science and Biotechnology of Animal Resources, Konkuk University)
Lee Ho (Department of Food and Biotechnology, Kyonggi University)
Publication Information
Food Science of Animal Resources / v.26, no.1, 2006 , pp. 144-147 More about this Journal
Abstract
This experiment was carried out to investigate the effect of mulberry fruit extinct on the acid production and growth of lactic acid bacteria. The extract of mulberry fruit was showed a high level of yield with 60% ethanol extraction. Lactic acid bacteria was used in a starter culture of Lactobacillus casei YIT9018 and 2782, and Lactobacillus acidophilus NCFM. After 24 hr culture in MRS broth added with 1.0, 5.0 and 10% of the extract 1.0% addition of the extract was showed pH $4.04{\sim}4.19$, titratable acidity $1.25{\sim}1.42%,\;and\;1.2{\sim}7.8{\times}10^9\;cfu/mL$ of viable cell count. The additions above 1.0% extract (5.0% and 10.0% addition) showed slightly lower effect than 1.0% addition. However, the addition of the extract showed a high effect on the growth of lactic acid bacteria comparing with the control. In yoghurt preparation with the extract, 1% addition of the extract showed a high effect on the growth of lactic acid bacteria, Therefore, it was suggested to manufacture of the yoghurt with the addition of 1% mulberry fruit extract and the inoculation of culture of Lactobacillus acidophilus for on the stimulation of growth of the lactic culture.
Keywords
mulberry fruit extract; Lactobacillus acidophilus; Lactobacillus casei; yoghurt;
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