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Chlorine Resistance of Pseudomonas Putrefaciens^*

Iowa Agricultural Experiment Station

ABSTRACT

When suspended in sterile distilled or pasteurized and filtered well water, Ps. putrefaciens was easily destroyed by chlorine, provided excessive numbers of cells were not present; destruction was especially active in the distilled water. When the numbers of organisms in relation to the amount of chlorine or its period of action were excessive, destruction was unsatisfactory. Among the strains tested there was some evidence of variation in chlorine resistance.

There was excellent agreement between growth of Ps. putrefaciens on a special agar and production of the putrid defect in unsalted butter at 21° C. Various suspensions yielding good growth on the agar failed to produce changes in litmus milk.

^* Journal Paper No. J-1123 of the Iowa Agricultural Experiment Station, Ames, Iowa. Project No. 119.