ISO INTERNATIONAL STANDARD 13580 IDF 151 First edition 2005-05-01 Yogurt Determination of total solids content (Reference method) Yaourt Determination de la teneur totale en matieres solides (Méthode de reference) Reference numbers ISO 13580:2005(E) IDF 151:2005(E) @ ISO and IDF 2005 No reproduction or networking pemitted without license from IHS Not for Resale ISO13580:2005(E) IDF 151:2005(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 parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies 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. @ISOandIDF2005 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 Dairy Federation Case postale 56 : CH-1211 Geneva 20 Diamant Building: Boulevard Auguste Reyers 80 · B-1030 Brussels Tel. + 41 22 749 01 11 Tel.+32 273398 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 Capyrghtintematinal organizationfor Standardization ISO and IDF2005-All rights reserved No reproduction or networking pemitted without license from IHS Not for Resale ISO 13580:2005(E) IDF151:2005(E) Contents Page Foreword 1 Scope.. 2 Normative references 3 Terms and definitions.. 4 Principle 5 Reagents 6 Apparatus 7 Sampling . 8 Preparation of test sample ... .2 8.1 Natural yogurt and flavoured, sweetened yogurt 8.2 Fruit yogurt .... 9 Procedure.. 9.1 Preparation of the dish ... 9.2 Test portion ... 9.3 Determination of total solids content 9.4 Determination of lactic acid content .. 10 Calculation and expression of results 10.1 Calculation ..... 10.2 Expressionofresults 11 Precision 11.1 Interlaboratory test 11.2 Repeatability. 11.3 Reproducibility 12 Test report.. 5 Annex A (informative) Interlaboratory test.. Bibliography ... ii Not for Resale ISO13580:2005(E) IDF 151:2005(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 and non-governmental, in liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC)onall mattersofelectrotechnical standardization International Standardsaredrafted inaccordancewiththe rulesgivenintheISO/lECDirectives,Part2 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 13580IDF 151 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk andmilkproducts,andtheInternationalDairyFederation(IDF),incollaborationwithAOACInternational CopyrightIntematinal Organization for Standardization @ISO and IDF2005-All rights reserved Not for Resale ISO 13580:2005(E) IDF 151:2005(E) Foreword IDF (the International Dairy Federation) is a worldwide federation of the dairy sector with a N