HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by LiCari, J. J. Articles by Potter, N. N. Search for Related Content PubMed PubMed Citation Articles by LiCari, J. J. Articles by Potter, N. N.

Salmonella Survival During Spray Drying and Subsequent Handling of Skimmilk Powder. III. Effects of Storage Temperature on Salmonella and Dried Milk Properties¹

Department of Food Science, Cornell University, Ithaca, New York 14850

ABSTRACT

Skimmilk powders inoculated with Salmonella typhimurium and Salmonella thompson before and after spray drying were stored at 25 to 55 C for up to 8 weeks. Salmonella reductions of 3 or more log cycles were obtained in 4 to 8 weeks at 45 and 55 C. Generally, destruction during storage was a dual-rate phenomenon, with rapid destruction during the first 2 weeks of storage followed by reduced rates. S. thompson was more resistant to heat storage than S. typhimurium; however, there was no difference between pre- and post-drying contamination and resistance to heat storage.

Stored powders were evaluated for progressive changes in product qualities including solubility index, scorched particles, color, and flavor. While very substantial Salmonella reductions occurred at 55 and 45 O in 4 weeks or less, at both temperatures adverse flavors were found in 1 week, and other physical defects, especially at 55 C, developed rapidly. Storage at 35 and even 25 C reduced Salmonella numbers considerably in 4 to 8 weeks, and would be expected to affect the counts of contaminated commercial powders. However, such storage did not make heavily contaminated powders salmonella-negative in 8 weeks, and would not substitute for good sanitation in the production of milk powder.

¹ Supported in part by U.S. Public Health Service Grant no. 01032.

² Present address: Beech-Nut, Inc., Canajoharie, New York 13317.