Faculty of Biotechnology and Food Sciences in Nitra Journal of Microbiology, Biotechnology and Food Sciences 1338-5178 no. 3 vol. 5 2015-12-01 2015-12-01 PHYSICOCHEMICAL AND RHEOLOGICAL PROPERTIES OF DOOGH UNDER SPECIFIC FERMENTATION 238 242 EN Babak Pakbin Babak Pakbin Razzagh Mahmoudi Razzagh Mahmoudi Omid Fakhri Omid Fakhri Fermented dairy products such as doogh are more nutritious than the natural milk from which they are made. In this study enhancing the viscosity of Doogh (Iranian yogurt drink) fermented by Leuconostoc mesenteroides under the optimum condition of exopolysaccharide (EPS) production including temperature of 25°C, agitation of 120 RPM and different sucrose contents from 0 to 2%, w/w, was investigated. Addition of sucrose was not influenced the rheological and sensory characteristics of Doogh samples before the fermentation significantly according to sensory and rheological analysis. The results of chemical, microbiological, viscosity, serum separation and sensory analysis showed that viscosity of Doogh increased corresponding to sucrose contents during the fermentation up to 10.01 cp with no change in the taste of the Doogh samples. Also, sensory analysis of consistency confirmed the viscosity results. Serum separation values of samples also showed enhancement in stability after the fermentation and finally, this special fermentation process contributed to enhancement in viscosity of Doogh as an edible suspension, with reasonable economic targets compared with other stabilizing methods.
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