期刊
COLLOIDS AND SURFACES B-BIOINTERFACES
卷 46, 期 3, 页码 182-187出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2005.11.005
关键词
dairy powders; surface composition; flowability; ESCA; angle of repose; surface fat
The surface composition of four industrial spray-dried dairy powders (skim milk powder, whole milk powder, cream powder and whey protein concentrate) was estimated by electron spectroscopy for chemical analysis (ESCA), and its influence on powder flowability was studied. It was found that skim milk powder flows well compared to the other powders because the surface is made of lactose and protein with a small amount of fat, whereas the high surface fat composition inhibits the flow of whole milk, cream and whey protein powders. However, the poor flowability of the powders with high surface fat coverage was drastically improved by removal of fat present on the surface through a brief wash with petroleum ether. The results obtained indicate that, although there are several parameters including particle size, which influence the flowability of powders, the flowability of powders is strongly influenced by the surface composition of powders, particularly for fat-containing powders. (c) 2005 Elsevier B.V. All rights reserved.
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