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Rapid detection of psychrotrophic bacteria in manufacturing grade raw milks.

Author(s) : TATINI S. R., MEKALA P., HABAZ A. el-, et al.

Type of article: Article

Summary

Methods to rapidly assess the bacteriological quality of raw milk were investigated. Whereas direct microscopic count, modified psychrotrophic plate count, and direct epifluorescent filter technique (DEFT) did not correlate well with initial psychrotrophic bacterial count of raw milk, improvements were obtained after preincubation of the milk samples. The best preincubation conditions were identified as 30 deg C for 6 h, 21 deg C for 10 h, 13 deg C for 15 h, 13 deg C for 20 h or 7 deg C for 37 h.The "square root" equation was applied to the data, and a model was produced for predicting growth of the native microflora of raw milk. Using this equation, a DEFT count after preincubation of the milk at 21 deg C for 10 h could accurately predict the initial psychrotroph count and the count after storage of the milk at 6 deg C for 48 h.

Details

  • Original title: Rapid detection of psychrotrophic bacteria in manufacturing grade raw milks.
  • Record ID : 1993-0341
  • Languages: English
  • Source: Journal of Food Protection - vol. 54 - n. 11
  • Publication date: 1991/11
  • Document available for consultation in the library of the IIR headquarters only.

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