08-30189644-DC.pdf

a Date: 16 September 2008 Origin: International Latest date for receipt of comments: 31 December 2008 Project no.: 2008/02945 Responsible committee: AW/307 Oil seeds, animal and vegetable fats and oils and their by products Interested committees: Title: Draft BS ISO 28198 Animal and vegetable fats and oils Determination of toluene insoluble matter Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 December 2008. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for information on commenting. 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Direct tel: 0207 283 5511 Responsible Committee Secretary: Mr John Hancock (BSI) E-mail: john.hancockfosfa.org Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 8.0 DPC: 08/30189644 DC Licensed CopyChinese University of Hong Kong, 21/10/2008 08:42, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on international discussions in which the UK has taken an active part. Your comments on this draft are invited and will assist in the preparation of the consequent standard. Comments submitted will be reviewed by the relevant BSI committee before sending the consensus UK vote and comments to the international secretariat, which will then decide appropriate action on the draft and the comments received. If no comments are received to the contrary, then the UK will approve this draft. 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Licensed CopyChinese University of Hong Kong, 21/10/2008 08:42, Uncontrolled Copy, (c) BSI THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH. IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS. RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION. DRAFT INTERNATIONAL STANDARD ISO/DIS 28198 © International Organization for Standardization, 2008 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION ISO/TC 34/SC 11 Voting begins on: 2008-09-12 Secretariat: BSI Voting terminates on: 2009-02-12 Animal and vegetable fats and oils Determination of toluene insoluble matter Corps gras d'origines animale et végétale Détermination des matières insolubles dans le toluène ICS 67.200.10 In accordance with the provisions of Council Resolution 15/1993 this document is circulated in the English language only. Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué en version anglaise seulement. To expedite distribution, this document is circulated as received from the committee secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at publication stage. 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Licensed CopyChinese University of Hong Kong, 21/10/2008 08:42, Uncontrolled Copy, (c) BSI ISO/DIS 28198 © ISO 2008 All rights reserved iii Contents Page Foreword iv 1 Scope1 2 Normative references1 3 Definition1 4 Principle .1 5 Reagents 1 6 Apparatus.2 7 Sampling 2 7.1 Preparation of the test sample:2 8 Procedure.3 9 Result of the determination3 9.1 Calculation:3 9.2 Interlaboratory test3 9.3 Repeatability4 9.4 Reproducibility 4 10 Test report4 Annex A (informative) Results of interlaboratory tests 5 Bibliography7 Licensed CopyChinese University of Hong Kong, 21/10/2008 08:42, Uncontrolled Copy, (c) BSI ISO/DIS 28198 iv © ISO 2008 All rights reserved 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 ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an 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 28198 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 11, Animal and vegetable fats and oils. Licensed CopyChinese University of Hong Kong, 21/10/2008 08:42, Uncontrolled Copy, (c) BSI DRAFT INTERNATIONAL STANDARD ISO/DIS 28198 © ISO 2008 All rights reserved 1 Animal and vegetable fats and oils Determination of toluene insoluble matter 1 Scope This international standard specifies a method for the determination of the content of toluene insoluble matter (TIM) in lecithin formulations, which indicates the presence of impurities such as protein, carbohydrate- containing extraction residues and other solid contaminants. This method is applicable to all types of vegetable lecithin. The purpose of the method is to enable the analysis of lecithin under several regulations. Lecithin (Codex International Numbering System for Food Additives (INS) No. 322) is a generally permitted additive and the determination of the TIM is part of many specifications. The purity requirement with regards to toluene insoluble content is based on the method described herein. Toluene is the replacement for benzene, which is used in older methods, but must not be used for reasons of toxicity. 2 Normative references The following referenced document is indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 4793:1980, Laboratory sintered (fritted) filters; Porosity grading, classification and designation 3 Definition For the purposes of this International Standard the following terms and definitions apply. 3.1 Toluene Insoluble Matter (TIM) Quantity of those substances that are insoluble in toluene under the conditions of this method. The Toluene Insoluble Matter is expressed in grams per 100 grams. 4 Principle The sample is dissolved in toluene and filtered through a glass filtering crucible of defined pore size (P40). The insoluble residue is dried at (103 ± 2) °C and weighed. NOTE Glass filtering crucibles with other pore sizes give different results and shall not be used. 5 Reagents WARNING Attention is drawn to the regulations which specify the handling of hazardous substances. Technical, organizational and personal safety measures shall be followed. Licensed CopyChinese University of Hong Kong, 21/10/2008 08:42, Uncontrolled Copy, (c) BSI ISO/DIS 28198 2 © ISO 2008 All rights reserved Unless otherwise stated analytically pure reagents are to be used. 5.1 Toluene. 6 Apparatus 6.1 30 ml glass filtering crucible P401, pore size 16 µm to 40 µm. NOTE According to ISO 4793 the porosity G3 (G2) is denominated as P40 (P100). The pore size of 16 µm to 40 µm is recommended by JECFA (www.fao.org/ag/agn/jecfa-additives/specs/monograph4/additive-250-m4.pdf) for the determination of TIM. IMPORTANT Cleaning procedure of the glass filtering crucibles: Fill the ultrasonic bath with an phosphate-free alkaline cleaning solution2 for laboratory glassware with a concentration of 10 %. Put the glass filtering crucibles into the ultrasonic bath for 30 min. Wash the glass filtering crucibles with water, and if necessary repeat the cleaning step. Clean the glass filtering crucibles in the laboratory cleaning machine. Use each glass filtering crucible for 10 analyses only, as then the pores are blocked and can not be cleaned to a sufficient standard. 6.2 Drying oven, temperature adjustable at (103 ± 2) °C. 6.3 Desiccator with silica gel. 6.4 Glass beaker, of 150 ml capacity, tall form. 6.5 Filtering bottle. 6.6 Vacuum pump (for the filtration). 6.7 Analytical balance. 6.8 Measuring cylinder, of 50 ml capacity. 6.9 Glass rods of different size. 7 Sampling A representative sample should have been sent to the laboratory. It should not have been damaged or changed during transport or storage. Sampling is not part of the method specified in this International Standard. A recommended sampling method is given in ISO 5555 1. 7.1 Preparation of the test sample: The sample is heated to max. 60 °C avoiding local overheating, and is homogenized by powerful stirring. Specific treatments of the test sample (filtration, melting etc) shall be mentioned in the analytical report. 1 DURAN® filtering crucible , porosity 2, volume 30 ml, diameter 36 mm, Cat. No. 25 851 22 (www.duran-group.com) is an example of a suitable product available commercially. 2 Extran® MA03 phosphate-free (Merck 107550) is an example of a suitable product available commercially. This information is gi