Insoluble Scum-Like Materials on Reconstituted Whole Milk Powders

Abstract
A study of the chemical properties of the scum-like material which floats on reconstituted whole milk powder showed it was composed of 34% protein and the remainder fat. The protein was shown to be destabilized calcium caseinate while the fat isolated from the scum had a higher melting point and was more saturated than the main fat fraction. This defect did not develop until after the powders had been stored at 85[degree] F. It is thought to be a complex between free fat and protein.