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Effect of Synbiotic Interaction of Fructooligosaccharide and Probiotics on the Acidification Profile, Textural and Rheological Characteristics of Fermented Soy Milk

Mishra, Shalini, Mishra, H. N.
Food and bioprocess technology 2013 v.6 no.11 pp. 3166-3176
Lactobacillus acidophilus, Lactobacillus plantarum, Lactobacillus rhamnosus, acidification, bacteria, coculture, functional foods, gels, hardness, milk, prebiotics, probiotics, raw materials, rheological properties, sampling, soymilk, yogurt
Preparation of yoghurt-like product from non-dairy raw material, such as soy with probiotic and prebiotic is a novel development in the field of fermented functional foods. This research work aimed at finding the new combinations of probiotics Lactobacillus acidophilus, Lactobacillus plantarum and Lactobacillus rhamnosus, which can give good product characteristics to fermented soy milk. Fructooligosaccharide was added in an attempt to reduce the after-taste of soymilk, improve acidification rates and growth of probiotics. Acidification rate was enhanced with L. acidophilus-L. plantarum and L. acidophilus-L. plantarum-L. rhamnosus, resulting in a shorter time to reach pH 4.5. Hardness was significantly (P< 0.05) higher for soy yoghurt fermented by binary co-culture followed by mixed cultures. All the samples showed higher G′ (1,279.70-1405 Pa) and lower tan δ (0.273-0.346) values which signifies firmer and solid-like character of the gel formed by probiotic bacteria. Soy yoghurt made with L. acidophilus-L. plantarum resulted in improved product characteristics with shorter t pH 4.5 (4.28 h). Soy yoghurt fermented with L. acidophilus-L. plantarum showed more than 9 log cfu/ml count which is required for probiotic functional food. ©Springer Science+Business Media New York 2012.