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Prediction of the shelf‐life of pasteurized milk using dry medium culture plates (3M Petrifilm, Hygicult and Millipore Sampler)
Author(s) -
PHILLIPS J D,
GRIFFITHS M W
Publication year - 1990
Publication title -
international journal of dairy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.061
H-Index - 53
eISSN - 1471-0307
pISSN - 1364-727X
DOI - 10.1111/j.1471-0307.1990.tb02423.x
Subject(s) - pasteurization , enumeration , plate count , shelf life , food science , crystal violet , chemistry , mathematics , chromatography , microbiology and biotechnology , biology , bacteria , genetics , combinatorics
Petrifilm SM Plate. Hygicult and Millipore Total Count Sampler were compared with normal plate count procedures for the enumeration of bacteria after preincubation of pasteurized milk. There were good correlations between results obtained using normal plate counts and those obtained with each of the other methods. Coupling these counting methods with preincubation procedures of 21°C for 25 hours in the presence of crystal violet‐penicillin‐nisin allowed prediction of the pass rate of the recently introduced 6°C/5 day storage test for pasteurized milk. The predictive accuracy was slightly improved by the use of preincubation conditions of 15°C for 25 hours. The availability of these devices enables quality control procedures to be set up on even the smallest processing site.