EN ISO 21187:2005
(Main)Milk - Quantitative determination of bacteriological quality - Guidance for establishing and verifying a conversion relationship between routine method results and anchor method results (ISO 21187:2004)
Milk - Quantitative determination of bacteriological quality - Guidance for establishing and verifying a conversion relationship between routine method results and anchor method results (ISO 21187:2004)
ISO 21187|IDF 196:2004 gives guidelines for the establishment of a conversion relationship between the results of a routine method and an anchor method, and its verification for the quantitative determination of the bacteriological quality of milk.
Milch - Quantitative Bestimmung der bakteriologischen Qualität - Leitfaden für die Erarbeitung einer Übertragungsbeziehung zwischen den Messwerten von Routine- und Bezugsverfahren sowie deren Verifizierung (ISO 21187:2004)
Diese Internationale Norm gibt Anleitungen für die Erarbeitung einer Übertragungsbeziehung zwischen den Ergebnissen eines Routine- und eines Kontrollverfahrens sowie für deren Verifizierung für die quantitative Bestimmung der bakteriologischen Qualität von Milch.
Lait - Mesure quantitative de la qualité bactériologique - Lignes directrices pour établir et vérifier une relation de conversion entre les résultats de la méthode de routine et les résultats de la méthode d'ancrage (ISO 21187:2004)
L'ISO 21187|FIL 196:2004 donne des lignes directrices pour l'établissement d'une relation de conversion entre les résultats d'une méthode de routine et une méthode d'ancrage et sa vérification en vue de la mesure de la qualité bactériologique du lait.
Mleko – Kvantitativno določanje bakteriološke kakovosti – Navodila za ugotavljanje in preverjanje konverzijske povezave med rezultati rutinske metode in rezultati uveljavljene metode (ISO 21187:2004)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2006
0OHNR±.YDQWLWDWLYQRGRORþDQMHEDNWHULRORãNHNDNRYRVWL±1DYRGLOD]D
XJRWDYOMDQMHLQSUHYHUMDQMHNRQYHU]LMVNHSRYH]DYHPHGUH]XOWDWLUXWLQVNHPHWRGHLQ
UH]XOWDWLXYHOMDYOMHQHPHWRGH ,62
Milk - Quantitative determination of bacteriological quality - Guidance for establishing and
verifying a conversion relationship between routine method results and anchor method
results (ISO 21187:2004)
Milch - Quantitative Bestimmung der bakteriologischen Qualität - Leitfaden für die
Erarbeitung einer Übertragungsbeziehung zwischen den Messwerten von Routine- und
Bezugsverfahren sowie deren Verifizierung (ISO 21187:2004)
Lait - Mesure quantitative de la qualité bactériologique - Lignes directrices pour établir et
vérifier une relation de conversion entre les résultats de la méthode de routine et les
résultats de la méthode d'ancrage (ISO 21187:2004)
Ta slovenski standard je istoveten z: EN ISO 21187:2005
ICS:
07.100.30 Mikrobiologija živil Food microbiology
67.100.10 0OHNRLQSUHGHODQLPOHþQL Milk and processed milk
SURL]YRGL products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 21187
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2005
ICS 67.100.01; 07.100.30
English Version
Milk - Quantitative determination of bacteriological quality -
Guidance for establishing and verifying a conversion relationship
between routine method results and anchor method results (ISO
21187:2004)
Lait - Mesure quantitative de la qualité bactériologique - Milch - Quantitative Bestimmung der bakteriologischen
Lignes directrices pour établir et vérifier une relation de Qualität - Leitfaden für die Erarbeitung einer
conversion entre les résultats de la méthode de routine et Übertragungsbeziehung zwischen den Messwerten von
les résultats de la méthode d'ancrage (ISO 21187:2004) Routine- und Bezugsverfahren sowie deren Verifizierung
(ISO 21187:2004)
This European Standard was approved by CEN on 30 September 2005.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21187:2005: E
worldwide for CEN national Members.
Foreword
The text of ISO 21187:2004 has been prepared by Technical Committee ISO/TC 34 "Agricultural
food productss” of the International Organization for Standardization (ISO) and has been taken
over as EN ISO 21187:2005 by Technical Committee CEN/TC 302 "Milk and milk products -
Methods of sampling and analysis", the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by April 2006, and conflicting national
standards shall be withdrawn at the latest by April 2006.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 21187:2004 has been approved by CEN as EN ISO 21187:2005 without any
modifications.
INTERNATIONAL ISO
STANDARD 21187
IDF
First edition
2004-12-01
Milk — Quantitative determination of
bacteriological quality — Guidance for
establishing and verifying a conversion
relationship between routine method
results and anchor method results
Lait — Mesure quantitative de la qualité bactériologique — Lignes
directrices pour établir et vérifier une relation de conversion entre
les résultats de la méthode de routine et les résultats de la méthode
d'ancrage
Reference numbers
ISO 21187:2004(E)
IDF 196:2004(E)
©
ISO and IDF 2004
ISO 21187:2004(E)
IDF 196:2004(E)
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Published in Switzerland
ii © ISO and IDF 2004 – All rights reserved
ISO 21187:2004(E)
IDF 196:2004(E)
Contents Page
Foreword. iv
Introduction . vi
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 1
4 Principles . 2
4.1 Prerequisites . 2
4.2 Organizational set-up . 2
5 Establishing a conversion relationship. 3
5.1 Consideration of influencing factors and their consequences. 3
5.2 Test samples . 4
5.3 Pretreatment of test samples. 5
5.4 Analysis. 6
5.5 Calculation. 7
5.6 Expression of results. 7
6 Verification of a conversion relationship . 8
6.1 Frequency of verification . 8
6.2 Test samples . 8
6.3 Pretreatment of test samples. 8
6.4 Analysis. 8
6.5 Calculation and verification of a conversion relationship. 8
7 Test report. 9
Annex A (informative) Number of samples for linear regression. 10
Bibliography . 13
ISO 21187:2004(E)
IDF 196:2004(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has
been established has the right to be represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 21187IDF 196 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5,
Milk and milk products, and the International Dairy Federation (IDF), in collaboration with AOAC International.
It is being published jointly by ISO and IDF and separately by AOAC International.
iv © ISO and IDF 2004 – All rights reserved
ISO 21187:2004(E)
IDF 196:2004(E)
Foreword
IDF (the International Dairy Federation) is a worldwide federation of the dairy sector with a National
Committee in every member country. Every National Committee has the right to be represented on the IDF
Standing Committees carrying out the technical work. IDF collaborates with ISO and AOAC International in
the development of standard methods of analysis and sampling for milk and milk products.
Draft International Standards adopted by the Action Teams and Standing Committees are circulated to the
National Committees for voting. Publication as an International Standard requires approval by at least 50 % of
the National Committees casting a vote.
ISO 21187IDF 196 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5,
Milk and milk products, and the International Dairy Federation (IDF), in collaboration with AOAC International.
It is being published jointly by ISO and IDF and separately by AOAC International.
All work was carried out by the Joint ISO/IDF/AOAC Action Team, Routine analysis in quantitative
microbiology, of the Standing Committee on Quality assurance, statistics of analytical data and sampling,
under the aegis of its project leader, Mr H.J.C.M. van den Bijgaart (NL).
ISO 21187:2004(E)
IDF 196:2004(E)
Introduction
Conversion in quantitative microbiology means expressing the result of a quantitative determination of the
bacteriological status of a test sample as obtained with a routine method in units of another method, generally
a reference or anchor method. Through this, quantitative results obtained with routine methods can be
compared to values or limits that are stated in reference or anchor method units. For establishing and applying
a conversion relationship, a number of prerequisites should be met. These are referred to in this International
Standard, but are generally described elsewhere.
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