Original scientific paper
Microflora changes examining of pasteurized cream with 30 % milk fat, during storage at refrigerator temperature
Ljerka Kršev
; Prehrambeno-biotehnološki fakultet, Pierottijeva 6, 10000 Zagreb
Olivera Marić
Abstract
During the last years, it was carried out that sporeforming bacteria are capable to grow at refrigerator temperature. The aim of this study was undertaken to establish whether such psychrotropic sporeformes were present in the pasteurized cream with 30 % milk fat stored at refrigerator temperature. The pasteurized cream with 30 % milk fat was purchased from the different places and stored at 9 °C until 5 days after the "sell-by" date. Then it was streaked onto milk agar plates in duplicate. One plate was incubated at 9 °C and the other at 30 °C. Each appearing colony type was isolated, purified and then identified by identification scheme Bacilus was the most frequently isolated organism from cream stored at the described condition. Pseudomonas formed only 4.2 % of the isolates at both temperatures. The incubation temperature (9 °C) was used in this study because it is thought to more closely represent the average temperature in the refrigerators.
Keywords
pasteurized cream; milk fat; microflora; storage
Hrčak ID:
96162
URI
Publication date:
2.10.1985.
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