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El-Sabie, W., El-Abd, M., Al-Assar, M., Hassan, M. (2010). PHYSICOCHEMICAL PROPERTIES OF YOGHURT FORTIFIED WITH DIFFERENT ZINC SALTS. Journal of Food and Dairy Sciences, 1(11), 669-679. doi: 10.21608/jfds.2010.82504
Wafaa B. El-Sabie; M. M. El-Abd; M. A. Al-Assar; M. A. Hassan. "PHYSICOCHEMICAL PROPERTIES OF YOGHURT FORTIFIED WITH DIFFERENT ZINC SALTS". Journal of Food and Dairy Sciences, 1, 11, 2010, 669-679. doi: 10.21608/jfds.2010.82504
El-Sabie, W., El-Abd, M., Al-Assar, M., Hassan, M. (2010). 'PHYSICOCHEMICAL PROPERTIES OF YOGHURT FORTIFIED WITH DIFFERENT ZINC SALTS', Journal of Food and Dairy Sciences, 1(11), pp. 669-679. doi: 10.21608/jfds.2010.82504
El-Sabie, W., El-Abd, M., Al-Assar, M., Hassan, M. PHYSICOCHEMICAL PROPERTIES OF YOGHURT FORTIFIED WITH DIFFERENT ZINC SALTS. Journal of Food and Dairy Sciences, 2010; 1(11): 669-679. doi: 10.21608/jfds.2010.82504

PHYSICOCHEMICAL PROPERTIES OF YOGHURT FORTIFIED WITH DIFFERENT ZINC SALTS

Article 3, Volume 1, Issue 11, November 2010, Page 669-679  XML PDF (434.65 K)
Document Type: Original Article
DOI: 10.21608/jfds.2010.82504
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Authors
Wafaa B. El-Sabie1; M. M. El-Abd2; M. A. Al-Assar2; M. A. Hassan1
1Dairy Chemistry Dept., Animal Production Res. Inst., Agric. Res. Center, Dokki, Giza, Egypt
2Dairy Science Dept.,Fac. Agric., Cairo Univ.
Abstract
Fresh buffalo’s milk of 6% fat was heated. Each of three zinc salts (Zinc gluconate, zinc sulphate and zinc acetate) was added to individual milk sample at levels of 30 mg Zn/L milk with the addition to the control treatment. Then, cooled, and inoculcated with 3% mixed culture of Lactobacillus delbrueckii sub sp. bulgaricus and Streptococcus salivarius sub sp thermophilus. and incubated at 42°C until firm curd was formed at pH 4.6.  The resultant yogurt was kept in refrigerator (6±1°C) for 10 days. Results showed a reduction in pH values, lactose content and the wheying off resulting in from the prepared yoghurt which supplemented with zinc salts. Whereas, an opposite trend was noticed for acidy, curd tension. While, yoghurt supplemented with zinc acetate recorded the highest value of acetaldehyde content. Moreover the zinc sulphate gained the highest viscosity till the 7 th day of storage. Concerning the sensory properties, enriching yoghurt with  zinc gluconate recorded the highest score in flavor, body & texture.
Keywords
Zinc.fortification. yoghurt
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