BS 4285-2.5:1989

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Microbiological examination for dairy purposes. Methods of general application for enumeration of microorganisms – Enumeration of bacteria by direct microscopic counts

Published By	Publication Date	Number of Pages
BSI	1989	6

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Categories: 07.100.30 - Food microbiology, BSI

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Description

This Section of BS 4285 describes two methods of general application for the direct enumeration of bacteria:

method A: direct microscopic count technique for total counts in milk;
method B: direct epifluorescent filter technique (DEFT) for total counts or counts of bacteria in milk, certain milk products and samples such as rinses.

NOTE 1. In samples (including plant rinses) that have received some degree of heat treatment (equivalent to pasteurisation or greater), certain organisms, particularly Gram-positive cocci, will fluoresce orange (i.e. as active) but will be non-viable by plate count methods. Therefore great care is needed in interpreting results using such samples.

NOTE 2. The titles of the publications referred to in this standard are listed on page 5.

Two methods: A for total counts in milk and B (direct epifluorescent filter technique) for total counts and counts of ‘active bacteria’ in milk and other samples.

Additional information

Status	Confirmed
Pages	6
Publication Date	1989-09-29
ISBN	0 580 17390 9
Standard Number	BS 4285-2.5:1989
Title	Microbiological examination for dairy purposes. Methods of general application for enumeration of microorganisms – Enumeration of bacteria by direct microscopic counts
Replaces	BS 4285-2-2.5:1984
Descriptors	Filtration, Count methods (microbiology), Dairy products, Milk, Testing conditions, Food testing, Microbiological analysis, Microscopic analysis, Biological analysis and testing, Food products, Stain tests, Bacteria count methods
Publisher	BSI
Committee	AW/9
ICS Codes	07.100.30 - Food microbiology

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BS 4285-2.5:1989

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