کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10378299 880752 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interfacial properties of acidified skim milk
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Interfacial properties of acidified skim milk
چکیده انگلیسی
The purpose of this study is to investigate the tension properties and dilatational viscoelastic modulus of various skim milk proteins (whole milk, EDTA-treated milk, β-casein, and β-lactoglobulin) at an oil/water interface at 20 °C. Measurements are performed using a dynamic drop tensiometer for 15,000 s. The aqueous bulk phase is a skim milk simulated ultrafiltrate containing 11×10−3g L−1 milk protein. At pH 6.7, β-casein appears as the best to decrease the interfacial tension, whereas β-lactoglobulin leads to the highest interfacial viscoelastic modulus value. Whole milk was almost as surface-active as individual β-casein in terms of the final (steady-state) lowering of the interfacial tension, but the rate of tension lowering was smaller. EDTA treatment improved the rate of tension lowering of whole milk. The acidification of milk, from previous measurements, would lead to the enhancement of surface activity. At t=15,000s, the order of effectiveness is pH 4.3 > pH 5.3 = pH 5.6 > pH 6.7 whole milk, suggesting that pH 4.3 whole milk is the best surface active. As compared to pH 6.7 whole milk, the use of pH 5.3 and pH 5.6 milk as surface active would result in the use of milk containing more free β-casein born of pH-dissociated casein micelles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 282, Issue 1, 1 February 2005, Pages 133-141
نویسندگان
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