ISO INTERNATIONAL STANDARD 8069 IDF 69 Second edition 2005-09-15 Dried milk Determination of content of lactic acid and lactates Lait sec - Determination de la teneur en acide lactique et en lactates Reference numbers ISO 8069:2005(E) IDF 69:2005(E) @ ISO and IDF 2005 Not for Resale ISO 8069:2005(E) IDF 69:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. Neither the ISo Central Secretariat nor the IDF accepts any liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation and IDF national committees. In the unlikely event that a problem relating to it is found, please inform the ISO Central Secretariat at the address given below. @ ISO and IDF 2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, address below. ISO copyright office International DairyFederation Case postale 56 . CH-1211 Geneva 20 Diamant Building·Boulevard Auguste Reyers 80.B-1030 Brussels Tel. + 4122 749 01 11 Tel. + 32 2 733 98 88 Fax + 41 22 749 09 47 Fax + 32 2 733 04 13 E-mail [email protected] E-mail [email protected] Web www.iso.org Web www.fil-idf.org Published in Switzerland CopyightInteratinal Oorganiationfor Standardization @ ISO and IDF 2005 - All rights reserved vithout license from IHS Not for Resale ISO 8069:2005(E) IDF 69:2005(E) Contents Page Foreword iv 1 Scope, 2 Terms and definitions. 3 Principle. 4 Reagents 5 Apparatus 6 Sampling. 3 7 Preparation ... 7.1 Preparation of test sample... 7.2 Test portion ............ 7.3 Blank test..... 7.4 Preparation of solution and deproteination 8 Procedure.. 8.1 Test to check the activity of reagents... 8.2 Determination... 9 Calculation and expression of results. 9.1 Calculation.... 9.2 Expression of results 10 Precision. 10.1 Interlaboratorytest 10.2 Repeatability..... 10.3 Reproducibility. 11 Test report. 8 Annex A (normative) Good laboratory practice (GLP) rules for the performance of enzymatic analyses.. Bibliography. 13 ii se from IHS Not for Resale ISO8069:2005(E) IDF 69:2005(E) Foreword IsO(theInternationalOrganizationforStandardization)isaworldwidefederationof nationalstandards bodies (isO member bodies). The work of preparing International Standards is normally carried out through ISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehas International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the IsO/lEc Directives, Part 2. adoptedbythetechnicalcommitteesarecirculatedtothememberbodiesforvoting.Publicationasan 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 8069liDF 69 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF). It is being published jointly by ISO and IDF. This edition of iSO 8069liDF 69 cancels and replaces ISO 8069:1986, which has been technically revised. onal Organization for Standardization @ ISO and IDF 2005 - All rights reserved ISO 8069:2005(E) IDF 69:2005(E) Foreword IDF(theInternationalDairyFederation)isaworldwidefederationofthedairysectorwithaNational Committee in every member country. Every National Committee has the