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    The combined effect of probiotic cultures and incubation final pH on the quality of buffalo milk yogurt during cold storage
    (Wiley, 2018) Akgun, Abdullah; Yazici, Fehmi; Gulec, Haci Ali
    The combined effects of starter culture type (SCT) and incubation final pH (IFpH) on the physicochemical and organoleptic properties of buffalo milk yogurt containing 3g100g(-1) milk fat were investigated throughout 20days of storage at 4 degrees C. The postacidification kinetics fitted to zero-order reaction for all buffalo milk yogurt samples. The reaction rate constants of the buffalo milk yogurt samples containing YC-X11, ABY-2, and ABT-4 cultures were 0.010, 0.007, and 0.004g100g(-1)day(-1), respectively. Regardless of the IFpH, the absence of Lactobacillus delbrueckii subsp. bulgaricus in the starter culture increased the syneresis. L*, a*, and b* values were not affected by the IFpH and the SCT. ABY-2 culture increased the amount of organic acids during cold storage in comparison with the YC-X11, while its effect on the proportions of saturated and unsaturated fatty acids was not significant. The results of sensory evaluation revealed that a more acceptable buffalo milk yogurt can be manufactured by using probiotic ABY-2 culture.
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    Effect of reduced fat content on the physicochemical and microbiological properties of buffalo milk yoghurt
    (Elsevier, 2016) Akgun, Abdullah; Yazici, Fehmi; Gulec, Haci Ali
    The objective of this study was to investigate the effect of reduced fat content in buffalo milk on textural, chemical and microbiological characteristics of plain buffalo yoghurt during storage at 4 degrees C. Four yoghurt samples were manufactured with different fat ratios (1.5-6 g/100 g) and analysed on the first, 10th and 20th days of storage. Increasing the fat content of the yoghurt increased the La value, viscosity, and cohesiveness and decreased the a* value, syneresis, hardness, and springiness. Fat reduction did not cause any significant changes in the adhesiveness, gumminess, titratable acidity, b* value, and Streptococcus thermophilus population of buffalo yoghurt samples. Storage time had no significant effect on adhesiveness, springiness, and L* value of buffalo yoghurts. A decrease in S. thermophilus and Lactobacillus delbrueckii subsp. bulgaricus populations during storage was detected. It was concluded that more acceptable buffalo yoghurt could be produced from milk with 3 g/100 g fat. (C) 2016 Elsevier Ltd. All rights reserved.