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Appl Environ Microbiol. 1973 August; 26(2): 206-210
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Effects of Various Gases on the Survival of Dried Bacteria During Storage

Division of Food Research, CSIRO, North Ryde, New South Wales, Australia
Division of Mathematical Statistics, CSIRO, North Ryde, New South Wales, Australia
Division of Food Research, CSIRO, Meat Research Laboratory, Cannon Hill, Queensland, Australia

ABSTRACT

Salmonella newport and Pseudomonas fluorescens were dried together in papain digest broth and sucrose-glutamate, and stored in several gases at various water activities (a_w) between 0.00 and 0.40 at 25 C for various periods up to 81 weeks. Both S. newport and P. fluorescens, dried in papain digest broth and stored in air, died rapidly if the conditions were very dry (0.00 a_w) or moist (0.40 a_w). Storage in carbon dioxide and argon gave greater survival than storage in air but lower survival than did storage in nitrogen or in vacuo. When the organisms were dried in a sucrose-glutamate mixture the differences between the gases were very small, and variations in residual water were less important. Of the inert gases, argon gave the best survival when the organisms were dried in papain digest broth, especially at 0.00 a_w; the survival in neon and krypton was lower and in xenon and helium it was much lower.