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A Filtration Method for Determining Sediment in Roller Process Nonfat Dry Milk Solids

Dairy Branch, Production and Marketing Administration, United States Department of Agriculture

ABSTRACT

INTRODUCTION

The relatively insoluble material in reconstituted roller process nonfat dry milk solids prevents the determination of sediment content, including scorched particles, by filtration through a standard lintine disc. The insoluble white protein material in reconstituted roller process nonfat dry milk solids appears as particles in suspension. These particles prevent filtration by covering the surface of the disc. As a substitute procedure, the tumbler method has been used. This method, as outlined by the American Dry Milk Institute (1), specifies that a reliquefied 25-g. sample shall be allowed to stand in a 20-oz. tumbler for 5 hr. After 5 hr., the amount of sediment on the bottom of the tumbler is visually compared with the ADMI Sediment Standards photoprint for the tumbler method.

Reports of work to establish a disc method for determining the sediment con-tent, including scorched particles, of roller process nonfat dry milk solids were not found in the literature.