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ISO 14461-2:2005
Milk and milk products — Quality control in microbiological laboratories — Part 2: Determination of the reliability of colony counts of parallel plates and subsequent dilution steps
Automatically translated name:
Milk and milk products -- Quality control in microbiological laboratories -- Part 2: Determination of the reliability of colony counts of parallel plates and subsequent dilution steps
STANDARD published on 12.4.2005
The information about the standard:
Designation standards: ISO 14461-2:2005
Publication date standards: 12.4.2005
SKU: NS-425438
The number of pages: 18
Approximate weight : 54 g (0.12 lbs)
Country: International technical standard
Category: Technical standards ISO
The category - similar standards:
Annotation of standard text ISO 14461-2:2005 :
Description / Abstract: ISO 14461-2|IDF 169-2:2005 describes a routine procedure for the evaluation of results of the enumeration of microorganisms using colony-count methods with subsequent 10-fold dilution steps and one plate or two parallel plates within each dilution step. This routine procedure is applied regularly in each laboratory performing colony counts. It provides criteria for the acceptability of differences between the results from parallel plates and subsequent dilution steps, as follows. The results (colony counts) obtained from parallel plates are compared with tabulated limits for given colony counts. If these limits are exceeded, a technical problem when performing the parallel determinations may be indicated. The results (sums of colony counts) of two parallel plates of two subsequent 10-fold dilution steps are compared with tabulated limits for given sums of colony counts. If these limits are exceeded, a technical problem when performing the dilutions may be indicated. If the limits mentioned above are exceeded in more cases than expected, this indicates that the test procedure lacks reliability.
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