کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
605736 880358 2007 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Comparative behaviour of goat β and αs1-caseins at the air–water interface and in solution
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Comparative behaviour of goat β and αs1-caseins at the air–water interface and in solution
چکیده انگلیسی

Here we present a comparative study of caprine β- and αs1-caseins behaviours at the air–water interface and in solution. Both caseins were purified from the milk of a single goat homozygous at the αs1- and β-Cn loci, with a high degree of purity (98%). Physical measurements (ellipsometry, surface pressure and surface rheology) were performed at the air–water interface, whereas SAXS measurements were performed on casein solutions. Our results clearly show that self-organizations, both at the air–water interface and in solution are different for β- and αs1-caseins. β-casein is unfolded in solution and forms a network at the interface, while αs1-casein forms compact objects in solution and is organised in fluid domains at the interface. We also show that the presence of Ca2+ in the subphase strongly disturbs the interfacial layer formed by the caseins. It is elsewhere worth noting that in solution, the aggregation of αs1-casein induced by calcium ions is associated with a pronounced change in the molecular structural organisation of the protein, which seems to adopt, in these conditions, an unfolded structure.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Hydrocolloids - Volume 21, Issue 8, December 2007, Pages 1330–1343
نویسندگان
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