Affiliation:
1. Department of Food Science, North Carolina State University, Raleigh, North Carolina 27607
Abstract
The thermal inactivation characteristics of
Bacillus stearothermophilus
(1518) spores and putrefactive anaerobe (PA) 3679 (NCA) spores suspended in skim milk were determined after treatment in pilot-plant ultrahigh-temperature (UHT) processing equipment. Temperature-survivor curves were constructed from survival data to emphasize the critical nature of temperature control in process evaluation. Time-survivor curves for PA 3679 spores were concave upward, and decimal reduction time (DRT) curves for these spores supported the observation of a protective response occurring at the longest exposure times. However, exposure time did not markedly affect the extremely high
z
D
value obtained for PA 3679 spores. The substitution of Gelysate for Trypticase and Thiotone as the peptone in the sporulation medium increased the relative heat resistance of
B. stearothermophilus
spores, but lowered the
z
D
value from 16 F to 12 F. The DRT curves in all cases were linear, but the
z
D
values observed in this study differed considerably from those reported by other workers.
Publisher
American Society for Microbiology
Subject
General Pharmacology, Toxicology and Pharmaceutics,General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine
Reference20 articles.
1. Heat adaptation and ion exchange in Bacillus megaterium spores;ALDERTON G., P.;Science,1964
2. Effect of divalent cations in the sporulation medium on the thermal death rate of Bacillus coagulans var. thermoacidurans;AMAHA M.;J. Bacteriol.,1957
3. AMERICAN PUBLIC HEALTH ASSocIATION. 1960. Standard methods for the examination of dairy products 11th ed. American Public Health Association Inc. New York.
4. AMERICAN PUBLIC HEALTH AssoCIATIoN. 1965. Standard methods for the examination of water and wastewater including bottom sediments and sludges 12th ed. American Public Health Association Inc. New York.
5. Enumeration of Bacillus stearothermophilus by use of membrane filter techniques to eliminate inhibitors present in milk;BUSTA F. F.;Appl. Microbiol.,1965
Cited by
5 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献