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1、BRITISH STANDARD BS ISO 5739:2003 Caseins and caseinates Determination of contents of scorched particles and of extraneous matter ICS 67.100.99 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 5739:2003 This British Standard was publ
2、ished under the authority of the Standards Policy and Strategy Committee on 27 January 2003 BSI 27 January 2003 ISBN 0 580 41143 5 National foreword This British Standard reproduces verbatim ISO 5739:2003 and implements it as the UK national standard. It supersedes BS 6248-9:1984 which is withdrawn.
3、 The UK participation in its preparation was entrusted to Technical Committee AW/5, Milk and milk products, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement inter
4、national publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to inclu
5、de all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquir
6、ies on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to vi, pages 1 to
7、 12, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:19 GMT+00:00 2006, Uncontrolled Copy, (c)
8、BSI RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFI- CATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION. IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO- LOGICAL, COMMERCIAL AND USER PURPOSES,
9、 DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STAN- DARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS. Reference numbers ISO 5739:2003(E) IDF 107:2003(E) INTERNATIONAL STANDARD ISO 5739 IDF 107 Second edition 2003-01-15 Case
10、ins and caseinates Determination of contents of scorched particles and of extraneous matter Casines et casinates Dtermination de la teneur en particules brles et en matires exognes BS ISO 5739:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:19 GMT+00:00 2006, Uncontrolled Copy, (c)
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14、hStneC Olar Scerteirata ta teh serddas igleb nevow. ii BS ISO 5739:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii Contents Page Foreword ISO.iv Foreword IDFv Introduction .vi 1 Scope 1 2 Normative references . 1 3 Terms and definit
15、ions. 1 4 Principle. 1 5 Reagents 1 6 Apparatus 2 7 Sampling 3 8 Procedure 3 8.1 Preparation of test sample. 3 8.2 Test portion . 4 8.3 Determination 4 9 Evaluation and expression of results. 5 9.1 Evaluation 5 9.2 Expression of results 5 10 Precision 5 10.1 Repeatability 5 10.2 Reproducibility 5 11
16、 Test report . 6 Annex A (normative) Testing of filtering discs 7 Annex B (normative) Preparation of standard discs of scorched particles. 10 Bibliography . 12 BS ISO 5739:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv Foreword ISO
17、(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 comm
18、ittee 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 electrote
19、chnical 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 memb
20、er 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 identifyi
21、ng any or all such patent rights. ISO 5739IDF 107 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF), in collaboration with AOAC International. It is being published jointly by ISO and IDF and separate
22、ly by AOAC International. This edition of ISO 5739IDF 107 cancels and replaces the first edition of ISO 5739:1983, which has been technically revised. BS ISO 5739:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI v Foreword IDF (the Inter
23、national Dairy Federation) is a worldwide federation of the dairy sector with a National Committee in every member country. Every National Committee has the right to be represented on the IDF Standing Committees carrying out the technical work. IDF collaborates with ISO and AOAC International in the
24、 development of standard methods of analysis and sampling for milk and milk products. Draft International Standards adopted by the Action Teams and Standing Committees are circulated to the National Committees for voting. Publication as an International Standard requires approval by at least 50 % of
25、 the National Committees casting a vote. ISO 5739IDF 107 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF), in collaboration with AOAC International. It is being published jointly by ISO and IDF and s
26、eparately by AOAC International. All work was carried out by the Joint ISO/IDF/AOAC Action Team, Physical properties of dried milk products, of the Standing Committee on Minor components and characterization of physical properties, under the aegis of its project leader, Mr. J. de Vilder (BE). This e
27、dition of ISO 5739IDF 107 cancels and replaces the first edition of IDF 107A:1995, which has been technically revised. BS ISO 5739:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI vi Introduction The method is derived from procedures dev
28、eloped by the United States Department of Agriculture (USDA) for the determination of scorched particles in dried milk. BS ISO 5739:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI NITERNATNOIAL STANDARD IS:9375 O3002(E) ID:701 F002(3)E
29、1 Caseins and caseinates Determination of contents of scorched particles and of extraneous matter 1 Scope This International Standard specifies a method for the determination of the contents of scorched particles and of extraneous matter in caseins and caseinates. 2 Normative references The followin
30、g referenced documents are 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 3310-1, Test sieves Technical requirements and testing Pa
31、rt 1: Test sieves of metal wire cloth 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 scorched particles content of caseins and caseinates amount of coloured residue per 25 g of test sample, determined and classified by the procedure specifie
32、d in this International Standard NOTE The scorched particles content is expressed by classification. 3.2 extraneous matter any foreign matter in the product associated with objectionable conditions or practices in production, storage or distribution 4 Principle A test portion is dissolved in a hot s
33、olution of sodium carbonate, sodium polyphosphate or disodium ethylenediaminetetraacetate, or in sodium hydroxide solution at room temperature or at 60 C 1 C. The solution obtained is filtrated through a filtering disc and dried. The dried disc with the scorched particles is visually compared with s
34、tandard discs. 5 Reagents Use only reagents of recognized analytical grade, unless otherwise specified, and distilled or demineralized water or water of equivalent purity. BS ISO 5739:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 5.
35、1 Sodium carbonate solution (Na2CO3), for acid caseins and for caseinates. Dissolve 100 g of anhydrous sodium carbonate in water in a 1 000 ml conical flask (6.2). Dilute to 1 000 ml with water and mix thoroughly until completely dissolved. Use the filtering device (6.6) and the filtering disc (6.5)
36、 to filter the solution into another 1 000 ml conical flask. 5.2 Sodium polyphosphate solution (Na5P3O10), for rennet caseins. Dissolve 20 g of a sodium polyphosphate (tripolyphosphate or a higher polyphosphate as used in the manufacture of processed cheese) in water in a conical flask (6.2). Dilute
37、 to 1 000 ml with water and mix thoroughly until complete dissolution. Use the filtering device (6.6) and the filtering disc (6.5) to filter the solution into another 1 000 ml conical flask. 5.3 Disodium ethylenediaminetetraacetate solution (C10H14N2Na2O8), for calcium caseinates. Dissolve 100 g of
38、disodium ethylenediaminetetraacetate (EDTA) dihydrate in water in a 1 000 ml conical flask (6.2). Dilute to 1 000 ml with water and mix thoroughly until completely dissolved. Use the filtering device (6.6) and the filtering disc (6.5) to filter the solution into another 1 000 ml conical flask. 5.4 S
39、odium hydroxide solution (NaOH), c(NaOH) 1 mol/l. Use this sodium hydroxide solution for caseins and caseinates which do not dissolve completely in the other reagents. Dissolve 40 g of sodium hydroxide in water in a 1 000 ml conical flask (6.2). Dilute to 1 000 ml with water and mix thoroughly until
40、 completely dissolved. Use the filtering device (6.6) and the filtering disc (6.5) to filter the solution into another 1 000 ml conical flask. 5.5 Ethanol, of volume fraction 95 % 2 %, for caseinates. 6 Apparatus Usual laboratory equipment and, in particular, the following. 6.1 Analytical balance, c
41、apable of weighing to the nearest 0,1 g. 6.2 Conical flasks, of capacities 600 ml and 1 000 ml. 6.3 Measuring cylinders, of capacities 100 ml and 500 ml. 6.4 Water bath, capable of maintaining a temperature of 60 C 1 C. 6.5 Filtering discs, of diameter 32 mm, suitable for use in the filtering device
42、 (6.6). The filter material should preferably consist of cotton, and the limit for retaining scorched particles and extraneous matter should be 5 m to 10 m. In addition, the disc shall be tested by the method specified in Annex A. 6.6 Filtering device, aspirator or pressure type, with a filtering ar
43、ea of diameter 28,6 mm. 6.7 Grinding device, for grinding the test sample, if necessary. To avoid loss of moisture, the device should not produce undue heat. A hammer shall not be used. 6.8 Test sieve, of metal wire cloth, with diameter 200 mm and nominal aperture size 500 m, with receiver, complyin
44、g with the requirements of ISO 3310-1. 6.9 Scorched particle standard discs, indicating increasing scorched particles content by the classification letters A, B, C and D, respectively (see Figure 1 for examples). BS ISO 5739:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:40:19 GMT+00
45、:00 2006, Uncontrolled Copy, (c) BSI 3 Instructions for the preparation of the scorched particle standard discs, if required, are given in Annex B. NOTE Prints of the standard discs are available from the United States Department of Agriculture, Agricultural Marketing Service, Washington DC 20250. O
46、rder by name and number1). Figure 1 shows examples of the discs. This illustration is not to be used for official classification of scorched particles content. 6.10 Microscope, providing a magnification of 25. Figure 1 Examples of standard scorched particle discs 7 Sampling It is important that the
47、laboratory receive a sample which is truly representative and has not 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 707. 8 Procedure 8.1 Preparation of test sample 8.1.1
48、Thoroughly mix the test sample by repeatedly shaking and inverting the container. If necessary, transfer the complete test sample to an airtight container of sufficient capacity to allow this operation to be carried out. 8.1.2 Transfer about 50 g of the thoroughly mixed test sample to the test sieve
49、 (6.8). If the amount of test sample directly passes or almost completely passes the sieve, use the test sample as prepared in 8.1.1. Proceed with the preparation of the test portion (8.2) and the determination (8.3) as soon as possible after the preparation of the sample. 8.1.3 If the 50 g test sample does not directly pass the sieve, grind the test sample by using the grinding device (6.7) until it passes the sieve. Immediately transfer all the sieved sample to an airtight co
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