BS-6248-9-1984 ISO-5739-1983.pdf
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1、BRITISH STANDARD BS 6248-9: 1984 ISO 5739:1983 Caseins and caseinates Part 9: Method for the determination of scorched particles ISO title: Caseins and caseinates Determination of scorched particles content NOTEThis Part should be read in conjunction with Part 1 “General introduction, including prep
2、aration of laboratory samples”, published separately. UDC 637.147.2.064:543.868 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:15:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6248-9:1984 This British Standard, having been prepared under the direction of the Dairying Standards Committe
3、e, was published under the authority of the Board of BSI and comes into effect on 29 February 1984 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference DAC/3 Draft for comment 78/50231 DC ISBN 0 580 13768 6 National foreword This Part of BS 6248, which ha
4、s been prepared under the direction of the Dairying Standards Committee, is identical with ISO 5739:1983 “Caseins and caseinates Determination of scorched particles content”, prepared by ISO/TC 34, Agricultural food products, of the International Organization for Standardization (ISO) in cooperation
5、 with the International Dairy Federation (IDF) and the Association of Official Analytical Chemists (AOAC). Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventio
6、ns are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Where the words “International Standard” appe
7、ar, referring to this standard they should be read as “this Part of this British Standard”. Cross-references. Related British Standards for ISO/R 707 and ISO 3310-1, referred to in the text, are respectively BS 809:1974 “Methods for sampling milk and milk products” and BS 410:1976 “Specification for
8、 test sieves”. With reference to 6.8, a wire cloth test sieve of aperture size 500 4m, complying with BS 410:1976 is suitable. With reference to clause 7, the methods for sampling given in BS 809:1974 may be employed. It is expected that the revision of ISO/R 707 will be published, when available, a
9、s a dual-numbered revision of BS 809. Additional information. With reference to clause 5, water complying with BS 3978:1966 “Water for laboratory use” is suitable. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible fo
10、r their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 8, an inside back cover and a back cover. This standard has been update
11、d (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:15:42 GMT+00:00 2006, Uncontrolled Cop
12、y, (c) BSI BS 6248-9:1984 BSI 12-1999i Contents Page National forewordInside front cover 1Scope and field of application1 2References1 3Definition1 4Principle1 5Reagents1 6Apparatus1 7Sampling2 8Procedure2 9Expression of results4 10Test report4 Annex A Testing of filtering disks5 Annex B Preparation
13、 of scorched particle standard disks6 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:15:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:15:42 GMT+00:00 2006, Uncontrolled Copy, (c) B
14、SI BS 6248-9:1984 BSI 12-19991 1 Scope and field of application This International Standard specifies a method for the determination of the scorched particles content of caseins and caseinates. 2 References ISO 707, Milk and milk products Methods of sampling1). ISO 3310-1, Test sieves Technical requ
15、irements and testing Part 1: Test sieves of metal wire cloth. 3 Definition scorched particles content of caseins and caseinates the amount of coloured residue, per 25 g or 10 g of sample, which is insoluble in a sodium carbonate, sodium polyphosphate, disodium ethylenediaminetetraacetate or sodium h
16、ydroxide solution, as determined and classified by the procedure specified in this International Standard 4 Principle Dissolution of a test portion in hot sodium carbonate, sodium polyphosphate or disodium ethylenediaminetetraacetate solution, or in sodium hydroxide solution at room temperature or a
17、t 60 C, filtration of the solution through a filtering disk and visual comparison of the dried disk with scorched particle standard disks. 5 Reagents The reagents shall be of recognized analytical quality. The water used in the preparation of the reagent solutions and in the determination shall be d
18、istilled water or water of at least equivalent purity, filtered before use. 5.1 Sodium carbonate solution (for acid caseins and for caseinates). Dissolve 100 g of anhydrous sodium carbonate (Na2CO3) in water, dilute to 1 000 ml and filter. 5.2 Sodium polyphosphate solution (for rennet caseins). Diss
19、olve 20 g of a sodium polyphosphate tripolyphosphate (Na5P3O10) or a higher polyphosphate as used in the manufacture of processed cheese in water, dilute to 1 000 ml and filter. 5.3 Disodium ethylenediaminetetraacetate solution (for calcium caseinates). Dissolve 100 g of EDTA, disodium salt, dihydra
20、te (C10H14N2Na2O82H2O) in water, dilute to 1 000 ml and filter. 5.4 Sodium hydroxide, approximately 1 mol/l solution (for caseins and caseinates which do not dissolve completely in the other reagents). Dissolve 40 g of sodium hydroxide in water, dilute to 1 000 ml and filter. 5.5 Ethanol, 95 2 % (V/
21、V) (for caseinates). 6 Apparatus Usual laboratory equipment, and 6.1 Balance, accurate to 0,1 g. 6.2 Conical flask, of capacity 600 ml. 6.3 Measuring cylinders, of capacities 100 and 500 ml. 6.4 Water bath, capable of being controlled at 60 1 C. 6.5 Filtering disks, of cotton lintine, diameter 32 mm
22、 (1.25 in), suitable for use in the filtering device (6.6). The cotton lintine shall be of approximately 135 g/m2 (4 oz/yd2) No. 1 filter cotton fibres. The disks shall be tested by the method specified in Annex A and shall meet the requirements specified therein. 6.6 Filtering device, aspirator or
23、pressure type, with a filtering area of diameter 28,6 mm (1.125 in). 1) At present at the stage of draft. (Revision of ISO/R 707:1968.) Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:15:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6248-9:1984 2 BSI 12-1999 6.7 Grinding device, for gri
24、nding the laboratory sample if necessary (see 8.1.4), without development of undue heat and without loss or absorption of moisture. A hammer-mill shall not be used. 6.8 Test sieve, of metal wire cloth, diameter 200 mm and nominal aperture size 500 4m with receiver, complying with the requirements of
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