title: Vitamin A distribution among fat globule core, fat globule membrane, and serum fraction in milk.
abstract: In cream suspensions and partly skimmed milks obtained by successive centrifugation from whole milk, the concentration of vitamin A per gram of fat was inversely related to the mean size of fat globules. This result indicated that not all the vitamin A of milk was located in the fat globule core, which was further supported by studies of buttermilk and butter oil fractions obtained by churning of cream. These studies indicated that a portion of the vitamin A was associated with the fat globule membrane. The vitamin A content per gram of fat of purified fat globules was similar to vitamin A content per gram of fat of the whole milk from which they were isolated. This result indicated that the amount of vitamin A in the serum fraction was negligible and that vitamin A was localized in the fat globule and fat globule membrane.
authors.affiliation: Department of Food Science and Nutrition, University of Minnesota, St. Paul 55108, USA.
authors.forename: M
authors.initials: M
authors.lastname: Zahar
authors.forename: D E
authors.initials: DE
authors.lastname: Smith
authors.forename: F
authors.initials: F
authors.lastname: Martin
mesh_terms: D000818:Animals; D002417:Cattle; D002462:Cell Membrane / Q000737:chemistry; D005260:Female; D008055:Lipids / Q000032:analysis*; D008892:Milk / Q000737:chemistry*; D010316:Particle Size; D014801:Vitamin A / Q000032:analysis*
chemical_list: D008055:Lipids; D014801:Vitamin A