BS ISO BRITISH STANDARD 23058:2006 Milk and milk products Ovine and caprine rennets - Determination of total milk-clotting activity ICS 67.100.01 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BSIS023058:2006 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 23058:2006. The UK participation in its preparation was entrusted to Technical Committee AW/5, Chemical analysis of milk and milk products. A list of organizations represented on AW/5 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliancewith a British Standard cannot confer immunityfrom legal obligations. This British Standard was Amendmentsissuedsincepublication published underthe authority of the Standards Policy and Amd. No. Date Comments Strategy Committee on 30 November 2006 BSI 2006 ISBN 0580 497631 BSIS023058:2006 ISO INTERNATIONAL STANDARD 23058 IDF 199 First edition 2006-09-15 Milk and milk products Ovine and caprine rennets Determination of total milk-clotting activity Lait etproduitslaitiersPresures ovines et caprines-Determination de I'activite totale de coagulationdu lait Reference numbers ISO 23058:2006(E) IDF 199:2006(E) ISO ii BS ISO 23058:2006 Contents Page Foreword. Introduction 1 Scope 2 Normative references 3 Terms and definitions.. 4 Principle 5 Reagents and materials 6 Apparatus. 7 Sampling... 8 Preparation oftest sample.. 8.1 Liquid ovine (or caprine) rennet.... 8.2 Ovine (orcaprine)rennetpaste.. 8.3 Powdered ovine (or caprine) rennet 9 Procedure.. 9.1 Preparationofsubstrate 9.2 Preparationof thecalf and adultbovinerennetreferencesolutions. 9.3 Preparationofthecalfandadultbovinerennetreferenceworkingsolutions 9.4 Preparation oftheovine (orcaprine)rennettest solution... 9.5 Clotting ... 10 Calculationandexpressionof results 10.1 Calculation.... 10.2 Expressionofresults 11 Precision.... 11.1 Interlaboratorytest 11.2 Repeatability 11.3 Reproducibility. 12 Test report AnnexA (informative)Results of interlaboratorytrial.. 10 Bibliography ili BS IS0 23058:2006 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 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, InternationalStandardsaredraftedinaccordancewiththerulesgivenintheISO/lECDirectives,Part2 adoptedbythetechnicalcommitteesarecirculatedtothememberbodiesforvoting.Publicationasan International Standard requires approval by at least 75 % of themember 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. ISO23058|iDF199was prepared byTechnical Committee ISO/TC34, Food products, Subcommittee SC 5, IDF. iv BS IS0 23058:2006 Foreword 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 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 byat least 5o % of the IDFNational Committees casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent ISO 23058lIDF 199 was prepared by the International Dairy Federation (IDF) and Technical Committee ISO/TC 34, Food products, Subcommit