EFFECT OF TEMPERATURE OF THE PLATING MEDIUM ON THE VIABLE COUNT OF PSYCHROPHILIC BACTERIA
- 1 December 1965
- journal article
- research article
- Published by International Association for Food Protection in Journal of Milk and Food Technology
- Vol. 28 (12) , 383-388
- https://doi.org/10.4315/0022-2747-28.12.383
Abstract
Various cultures of pseudomonads reacted differently to changes in temperature of the plating medium during pouring. An increase in the temperature of the medium during pouring from 45–50 C caused a reduction of 25% or more in the viable count of six of the nine cultures at one or more of the sampling periods. With the pouring medium adjusted to 60–70 C, large reductions in count usually were observed. In a majority of the cases, the count at 40 C was similar to that observed on plates poured at 45 C. Changes in the temperature of the mixture of sample and plating medium during pouring of the plates were recorded with a thermistor thermometer. The temperature of the mixture with 0.1 ml sample was slightly higher than with a 1 ml sample. Maximum temperature of the mixture during pouring was 33 C with the medium at 40 C and 47 C with the medium adjusted to 70 C.This publication has 0 references indexed in Scilit: