Effects of somatic cell counts on the physicochemical and rheological properties of yoghurt made from sheep's milk
2010
Najaf Najafi, Masoud | Koocheki, Arash | Valibaigy, Saeedeh
In the present work, yoghurts were made from sheep's milk with two different somatic cell count (SCC), at low (200 000 cells mL⁻¹) and high (750 000 cells mL⁻¹) levels. The characteristics of the final product were analysed for pH, acidity, protein, total solids, fat, syneresis, water holding capacity (WHC) and apparent viscosity. Samples were analysed on days 1, 7 and 14 after production of yoghurts. The SCC had no significant effect either on the acidity or pH of the yoghurt at 24 h (P > 0.05) but a significant effect (P < 0.05) was observed at 168 h. No effects of SCC were observed on total solids and fat content of the yoghurt after 24 and 168 h. High SCC (HSCC) yoghurt had higher protein content (P < 0.05). The yoghurt with the highest SCC had the highest level of syneresis. Viscosity of HSCC yoghurt was higher than that of the low SCC yoghurt on days 1, 7 and 14 of storage. The flow properties also showed that the low SCC yoghurt was softer than that from milk with high content in somatic cells.
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