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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
12. 4. 2005.

Опште информације

90.93     23. 9. 2020.

ISO

ISO/TC 34/SC 5

Međunarodni standard

07.100.30  

engleski  

Kupovina

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Apstrakt

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.

Životni ciklus

TRENUTNO

OBJAVLJEN
ISO 14461-2:2005
90.93 Odluka o potvrđivanju standarda
23. 9. 2020.

Nacionalna preuzimanja

Mleko i proizvodi od mleka — Kontrola kvaliteta u mikrobiološkim laboratorijama — Deo 2: Određivanje pouzdanosti brojanja kolonija na paralelnim pločama i koraka pri razblaživanju koji slede

90.93 Odluka o potvrđivanju standarda

E034-5 Saznaj više