ISO/TS TECHNICAL SPECIFICATION 19046-1 IDF/RM 233-1 First edition 2017-05 Cheese Determination of propionic acid level by chromatography Part 1: Method by gas chromatography Fromages - Détermination de la teneur en acide propionique par chromatographie - Partie 1: Méthode par chromatographie en phase gazeuse Reference numbers IS0/TS 19046-1:2017(E) Tso IDF/RM 233-1:2017(E) International Organization for Standardization G INST OF STANDARDIZATION C15956617 @ IS0 and IDF 2017 ed without license from IHS IS0/TS 19046-1:2017(E) IDF/RM 233-1:2017(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 or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior 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 [email protected] [email protected] www.iso.org www.fil-idf.org Licens-ZHEJIANG INST OF SPASAbZAdJPF 7 - All rights reserved Not for Resale, 2017/8/21 01:40:03 networking permited without license from IHS IS0/TS 19046-1:2017(E) IDF/RM 233-1:2017(E) Contents Page Forewords ..iv 1 Scope .1 2 Normative references ..1 3 Terms and definitions 4 Principle 5 Reagents. ..1 6 Apparatus. ..2 7 Sampling. 8 Preparation of test sample .4 9 Procedure. .4 9.1 Extraction system .4 9.2 Preparation of the soap .4 9.3 Quantitative determination by gas chromatography .4 9.3.1 Calculation of response factor. 4 9.3.2 Determination of the test portion .5 10 Calculation and expression of results. .5 10.1 Calculation of propionic acid in cheese .5 10.2 Expression of results. .5 11 Precision .5 11.1 Interlaboratory test .5 11.2 Repeatability .5 12 Test report .6 Annex A (informative) Example of extraction system ..7 Annex B (informative) Example of GC chromatogram ..8 Annex C (informative) Interlaboratory test ..9 Bibliography 10 iii icensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 ithout license from IHS