Color parameters and rheological properties of Rayeb milk made from cow milk and quinoa milk mixture

نوع المستند : المقالة الأصلية

المؤلفون

1 Dairy Microbiology Research Department, Animal Production Research Institute, Agricultural Research Center, Dokki, Giza, Egypt

2 Dairy Technology Research Department, Animal Production Research Institute, Agricultural Research Center, Dokki, Giza, Egypt

المستخلص

The aim of this study was to prepare a bio-fermented milk product (Rayeb milk) with high nutritional and health benefits. Five various samples of Rayeb milk were manufactured as follow: T1 from cow milk, T2 from quinoa milk, T3 from cow and quinoa milk mixture (50%:50%), T4 from cow and quinoa milk mixture (75%:25%) and T5 from cow and quinoa milk mixture (25%:75%). ABT-5 culture was used as starter culture. The results showed that mixing of quinoa milk with cow milk stimulated starter bacteria during fermentation period. Rayeb contained quinoa milk had higher acidity and total protein/DM and lower moisture and Fat/DM values than those of cow milk Rayeb. Values of L* and b* slightly decreased whereas a* values slightly increased in Rayeb produced using quinoa and cow milk mixtures. The addition of quinoa milk to cow milk led to reduction in serum separation and syneresis levels. Apparent viscosity, yield stress and consistency coefficient values increased while plastic viscosity and flow behavior index values lowered in quinoa milk Rayeb. On the basis of the obtained results, it can be concluded that Rayeb milk made with 25 or 50% quinoa milk have better rheological characteristics than that of control Rayeb.

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