Please use this identifier to cite or link to this item: https://doi.org/10.1108/00346651011044014
Title: Enhancing stability of lactic acid bacteria and probiotics by Williopsis saturnus var. saturnus in fermented milks
Authors: Liu, S.-Q. 
Tsao, M.
Keywords: Bacteria
Food technology
Milk
Issue Date: 2010
Citation: Liu, S.-Q., Tsao, M. (2010). Enhancing stability of lactic acid bacteria and probiotics by Williopsis saturnus var. saturnus in fermented milks. Nutrition and Food Science 40 (3) : 314-322. ScholarBank@NUS Repository. https://doi.org/10.1108/00346651011044014
Abstract: Purpose: There is a need to improve stability of lactic acid bacteria (LAB) and probiotics in fermented milks especially at elevated temperatures. The purpose of this paper is to evaluate the impact of yeast Williopsis saturnus var. saturnus on stability of LAB and probiotic Lactobacillus rhamnosus in fermented milks. Design/methodology/approach: Fermented milks were made from reconstituted whole milk with different milk solids contents. The milk was fermented with L. rhamnosus DR20 with and without yoghurt cultures. The treatment had yeast added, whereas the control did not. Fermented milks were incubated at different temperatures and samples were taken regularly for microbial count determination. Findings: The effect of the yeast on stability of L. bulgaricus and L. rhamnosus varied with temperatures: no effect at 4 and 40 °C, increasing effects from 10 to 30°C with enhanced lactobacilli survival by 102 to 107-fold. The yeast enhanced L. bulgaricus and L. rhamnosus stability by approximately 106 to 107-fold in fermented milks with 5 per cent w/v and 20 per cent w/v milk solids at 30 °C. Research limitations/implications: Use of live yeast has limitations. The yeast must not ferment lactose and galactose, and fermentable sugars cannot be used as sweeteners to avoid yeast growth. Further understanding of the interaction between yeast and LAB may eliminate the need to add viable yeast. Originality/value: Use of yeast to enhance stability of LAB and probiotics is a novel concept. Addition of selected yeast could be an effective means of enhancing stability of LAB and probiotics in fermented milks to extend shelf-life and to retain nutritional value. © Emerald Group Publishing Limited.
Source Title: Nutrition and Food Science
URI: http://scholarbank.nus.edu.sg/handle/10635/93763
ISSN: 00346659
DOI: 10.1108/00346651011044014
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