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Published on: February 15, 2018
Psychrotrophic Growth of Microorganisms in a Cultured Milk Product
A Y Sadovski1, S Gordin1, I Foreman1
1Food Science Laboratory, Faculty of Agriculture, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot, Israel and Division of Food Technology, Agriculture Research Organization, The Volcani Center, Bet-Dagan, Israel.
Abstract:
Characterization of psychrotrophic bacteria from cultured milk has shown that most (72%) of the psychrotrophs which were isolated originated from the starter culture. Streptococcus lactis subsp. diacetilactis was the most abundant organism and dominated both Streptococcus cremoris and Leuconostoc cremoris , which was the least abundant. The doubling time of S. lactis subsp. diacetilactis at 7 C was 20 h and 54 h in Trypticase Soy Broth at pH 7.0 and 5.0, respectively. This indicates a growth potential which could be significant to the quality of the product over a long storage period. Psychrotrophic coliforms which had optimal growth temperatures within the range of 15 to 30 C could also be found in small numbers. Their survival in the product was limited and it was concluded that they have little effect on shelf-life.
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