ISO/TS TECHNICAL SPECIFICATION 19046-2 IDF/RM 233-2 First edition 2017-05 Cheese Determination of propionic acid level by chromatography Part 2: Method by ion exchange chromatography Fromages - Détermination de la teneur en acide propionique par chromatographie- Partie 2: Methode par chromatographie par échange d'ions Reference numbers IS0/TS 19046-2:2017(E) ISO IDF/RM 233-2:2017(E) International Organization for Standardization G INST OF STANDARDIZATION C1 5956617 @ IS0 and IDF 2017 Not for Resale, 2017/8/21 01:41:2 ed without license from IHS IS0/TS 19046-2:2017(E) IDF/RM 233-2:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 and IDF 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office InternationalDairyFederation Ch. de Blandonnet 8 . CP 401 Silver Building ·Bd Auguste Reyers 70/B·B-1030 Brussels CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Tel. + 32 2 325 67 40 Fax +41 22 749 09 47 Fax +32 2 325 67 41 copyright@iso.org info@fil-idf.org www.iso.org www.fil-idf.org Licensee-ZHEJIANG INST OF PANSARZAdJPF SO7 - All rights reserved Not for Resale, 2017/8/21 01:41:24 No reproduction or networking permited withoutlicense from IHS IS0/TS 19046-2:2017(E) IDF/RM 233-2:2017(E) Contents Page Forewords ..iv 1 Scope 2 Normative references ..1 3 Terms and definitions 4 Principle 5 Reagents. ..1 6 Apparatus. ..2 7 Sampling. ..3 8 Preparation of test sample ..3 9 Quantitative determination by HPLC ..3 9.1 Calibration 3 9.2 Sampletest .3 10 Calculation and expression of results .4 10.1 Calculation of propionic acid in cheese ..4 10.2 Expression of results .4 11 Precision ..4 11.1 Interlaboratory test ..4 11.2 Repeatability 12 Test report. ..4 Annex A (informative) Example of HPLC chromatogram ..5 Annex B (informative) Interlaboratory test .6 Bibliography 7 iii icensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 dwithout license from IHS