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[Spoilage microorganisms encountered in ultra-high temperature processed milk].

[Article in Chinese]


40 strains of aerobic or facultative anaerobic microorganisms were isolated from a total of 37 spoiled ultra high temperature processed milk. 13 of them were identified as the genus Bacillus. They were 6 B. cereus, 5 B. licheniformis, 1 B. brevis and 1 B. pumilus. The other 27 strains were nonsporeforming microorganisms, which included 5 yeasts, 2 Pseudomonas sp., 3 Streptococcus sp., 12 Lactobacillus sp., 1 Shigella sp., 1 Aeromonas sp. and 3 Micrococcus sp. Results indicate that the spoilage of milk sample was caused mainly by the contamination during the filling operation. The Bacillus strains isolated were mesophilic or thermophilic, and some of them, were also psychrotrophic.

[PubMed - indexed for MEDLINE]
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