ISSN 2756-326X
Advances in Agriculture and Agricultural Sciences ISSN 2381-3911 Vol. 3 (12), pp. 001-004, December, 2017. © International Scholars Journals
Full Length Research Paper
Studying microbial, physiochemical and sensory properties of directly concentrated probiotic yoghurt
Samira Yeganehzad, Mostafa Mazaheri-Tehrani and Fakhri Shahidi
Food Science and Technology Department, Ferdowsi University of Mashhad, Iran.
Accepted 26 May, 2017
Abstract
Skim milk with 8.5% total solids was concentrated to 15 and 20% total solids by vacuum evaporation and inoculated with probiotic Lactobacillus. Yoghurts were incubated at 42oC and stored at 4oC. Survival of Lactobacillus, physiochemical (pH, acidity, synersis, and hardness) and sensory properties (taste and texture) of probiotic yoghurts were evaluated every 7 days to 21 days. Results showed that, increasing the total solid concentration of milk increased the survival of Lactobacillus acidophilus, acidity and hardness of yoghurt and reduced the pH and synersis. However, the survival of probiotic Lactobacillus decreased throughout the storage period at 4oC. This work shows the importance of total solid concentration of milk on survival probiotic strains, physiochemical and sensory properties of yoghurt.
Key words: probiotic yogurt, total solids, probiotic survival, physiochemical properties, sensory properties.