Matematikk. Naturvitenskap

Komité: ISO/TC 34/SC 9 (Microbiology)
Opprinnelse:
Sluttdato: 13. feb 2018
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Komité: CEN/TC 275 (Food analysis - Horizontal methods)
Opprinnelse:
Sluttdato: 16. feb 2018
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The proposed deliverable specifies an alternative technical protocol for the validation of mostly non-proprietary methods in the field of microbiological analysis of food, animal feed, and environmental and primary production stage samples. It is closely related to ISO 16140-2. The latter specifies the technical protocol for the validation of proprietary methods, including a classical interlaboratory study and a method comparison study to be conducted in one laboratory. The realization of classical interlaboratory studies demands a sufficient number of participating laboratories (at least 8 laboratories are required). There are many occasions where a sufficient number of participating laboratories is not available (e.g. when a new method is required quickly after an outbreak of a new microorganism). In this case, the validation cannot be considered as reliable any longer. The proposed deliverable uses a modified protocol based on orthogonal, factorial studies. By selection of suitable influencing factors (technician, nutrient media, sample preparation, temperature, duration) a high certainty of the determined method validation parameters is obtained, so that the number of required collaborating laboratories can be reduced up to a minimum of 4. This validation protocol can be used in different ways. If the 4 collaborators can be considered a “random sample” of independent and competent laboratories and from different organizations, the test method can be considered as being validated in the sense that accurate and precise measurements are to be expected from any competent laboratory. If the 4 collaborators can be considered a “random sample” of independent and competent laboratories from one organization, the test method can be considered as being validated in the sense that accurate and precise measurements are to be expected from any competent laboratory in this organization.
Komité: CEN/TC 275 (Food analysis - Horizontal methods)
Opprinnelse:
Sluttdato: 16. feb 2018
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This document deals with verification of methods for the detection and/or the enumeration of microorganisms, with particular emphasis on the implementation of a reference/alternative method in the user laboratory and verification of a reference/alternative method using items included in the scope of the method and tested routinely but not tested in the original validation study
Komité: CEN/TC 275 (Food analysis - Horizontal methods)
Opprinnelse:
Sluttdato: 16. feb 2018
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The proposed deliverable specifies the procedure for single-laboratory validation of mainly non-proprietary methods in the fields of microbiological analysis of food, feed, and environmental and primary production stage samples. Single-laboratory validation is required if an interlaboratory validation according to ISO 16140-2 is not appropriate, e.g. for in-house methods or when the required number of participating laboratories is not available. Single-laboratory validation is not part of the optimization of methods. It can be applied only for methods that are fully specified with regard to all relevant parameters (including tolerances on temperatures and specifications on nutrient media). The proposed deliverable describes two protocols for single-laboratory validation, a conventional protocol, and a factorial protocol. The conventional protocol is a stepwise procedure; both the study design and the performance measures are derived from ISO 16140-2. The performance measures of the factorial protocol are also derived from ISO 16140-2; however, it is using an orthogonal, factorial study design. By selection of suitable influencing factors (technician, nutrient media, sample preparation, temperature, duration) a high certainty of the determined method validation parameters is obtained, so that the number of required individual tests can be reduced by more than 50 %.
Komité: CEN/TC 275 (Food analysis - Horizontal methods)
Opprinnelse:
Sluttdato: 16. feb 2018
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This part of ISO 16140 specifies the general principle and the technical protocol for the validation of alternative, mostly proprietary, confirmation methods in the field of microbiological analysis of food, animal feed, and environmental and primary production stage samples. This procedure is limited to the validation of alternative (proprietary) confirmation methods that are intended to replace (partly or completely) the confirmatory procedure described in the standard method for the enumeration or detection of specific (group of) microorganisms. The "sample" to be used for confirmation shall be a suspected colony that has been obtained following the reference or alternative culture method procedure. It is however not intended for confirmation using a (pure) colony from an unknown origin. Validation studies according to this standard are intended to be performed by organizations involved in method validation.