BS EN ISO 1737-2008 Evaporated milk and sweetened condensed milk - Determination of fat content - Gravimetric method (Reference method)《炼奶和加糖炼奶 脂肪含量的测定 重量分析法(参考法)》.pdf

1、BS EN ISO1737:2008ICS 67.100.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDEvaporated milk andsweetened condensedmilk Determinationof fat content Gravimetric method(Reference method)(ISO 1737:2008)Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/05/

2、2009 03:29, Uncontrolled Copy, (c) BSIThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 January2009 BSI 2009ISBN 978 0 580 63537 3Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 1737:2008National forewordThis British Standar

3、d is the UK implementation of EN ISO 1737:2008. Itsupersedes BS EN ISO 1737:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee AW/5, Chemical analysis of milk and milk products.A list of organizations represented on this committee can be obtained onre

4、quest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/0

5、5/2009 03:29, Uncontrolled Copy, (c) BSIEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 1737October 2008ICS 67.100.10 Supersedes EN ISO 1737:1999 English VersionEvaporated milk and sweetened condensed milk - Determinationof fat content - Gravimetric method (Reference method) (ISO1737:2008)Lait

6、 concentr sucr et non sucr - Dtermination de lateneur en matire grasse - Mthode gravimtrique(Mthode de rfrence) (ISO 1737:2008)Kondensmilch und gezuckerte Kondensmilch -Bestimmung des Fettgehaltes - Gravimetrisches Verfahren(Referenzverfahren) (ISO 1737:2008)This European Standard was approved by CE

7、N on 14 October 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards m

8、ay be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CE

9、N Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,

10、 Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any for

11、m and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 1737:2008: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/05/2009 03:29, Uncontrolled Copy, (c) BSIBS EN ISO 1737:2008EN ISO 1737:2008 (E) 3 Foreword This document (EN ISO 1737:2008) has been prepared by Techni

12、cal Committee ISO/TC 34 “Agricultural food products“ in collaboration with Technical Committee CEN/TC 302 “Milk and milk products - Methods of sampling and analysis” the secretariat of which is held by NEN. This European Standard shall be given the status of a national standard, either by publicatio

13、n of an identical text or by endorsement, at the latest by April 2009, and conflicting national standards shall be withdrawn at the latest by April 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not

14、 be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 1737:1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

15、 Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of I

16、SO 1737:2008 has been approved by CEN as a EN ISO 1737:2008 without any modification. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/05/2009 03:29, Uncontrolled Copy, (c) BSIBS EN ISO 1737:2008ISO 1737:2008(E) IDF 13:2008(E) ISO and IDF 2008 All rights reserved iiiContents Page Foreword i

17、v Foreword. v 1 Scope 1 2 Normative references 1 3 Term and definitions .1 4 Principle1 5 Reagents.2 6 Apparatus .2 7 Sampling.3 8 Preparation of test sample4 8.1 Evaporated milk .4 8.2 Sweetened condensed milk4 9 Procedure .4 9.1 Test portion 4 9.2 Blank tests4 9.3 Preparation of fat-collecting ves

18、sel.5 9.4 Determination.5 10 Calculation and expression of results.7 10.1 Calculation7 10.2 Expression of results 8 11 Precision.8 11.1 Interlaboratory test 8 11.2 Repeatability.8 11.3 Reproducibility.8 12 Test report 9 Annex A (informative) Notes on procedures 10 Annex B (informative) Alternative p

19、rocedure using fat-extraction tubes with siphon or wash-bottle fittings .12 Bibliography 15 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/05/2009 03:29, Uncontrolled Copy, (c) BSIBS EN ISO 1737:2008ISO 1737:2008(E) IDF 13:2008(E) iv ISO and IDF 2008 All rights reservedForeword ISO (the I

20、nternational 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

21、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 electrotechnica

22、l 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 bod

23、ies 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

24、 or all such patent rights. ISO 1737IDF 13 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF). It is being published jointly by ISO and IDF. This fourth edition of ISO 1737IDF 13 cancels and replaces t

25、he third edition (ISO 1737:1999), of which it constitutes a minor revision. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/05/2009 03:29, Uncontrolled Copy, (c) BSIBS EN ISO 1737:2008ISO 1737:2008(E) IDF 13:2008(E) ISO and IDF 2008 All rights reserved vForeword IDF (the International Dair

26、y Federation) is a non-profit organization representing the dairy sector worldwide. IDF membership comprises National Committees in every member country as well as regional dairy associations having signed a formal agreement on cooperation with IDF. All members of IDF have the right to be represente

27、d at the IDF Standing Committees carrying out the technical work. IDF collaborates with ISO in the 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 Com

28、mittees for voting. Publication as an International Standard requires approval by at least 50 % of the IDF National Committees casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IDF shall not be held responsible for i

29、dentifying any or all such patent rights. ISO 1737IDF 13 was prepared by the International Dairy Federation (IDF) and Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products. It is being published jointly by IDF and ISO. All work was carried out by the Joint ISO-IDF A

30、ction Team Fat of the Standing Committee on Main components in milk under the aegis of its project leader, Mr G.J. Beutick (NL). This edition of ISO 1737IDF 13 cancels and replaces IDF 13:1987, of which it constitutes a minor revision. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/05/200

31、9 03:29, Uncontrolled Copy, (c) BSIBS EN ISO 1737:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/05/2009 03:29, Uncontrolled Copy, (c) BSIBS EN ISO 1737:2008INTERNATIONAL STANDARD ISO 1737:2008(E)IDF 13:2008(E) ISO and IDF 2008 All rights reserved 1Evaporated milk and sweetened conden

32、sed milk Determination of fat content Gravimetric method (Reference method) WARNING The use of this International Standard may involve hazardous materials, operations and equipment. This International Standard does not purport to address all the safety problems associated with its use. It is the res

33、ponsibility of the user of this International Standard to establish safety and health practices and determine the applicability of regulatory limitations prior to use. 1 Scope This International Standard specifies the reference method for the determination of the fat content of all types of evaporat

34、ed milk and sweetened condensed milk (liquid sweetened and unsweetened concentrated milk). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest editio

35、n of the referenced document (including any amendments) applies. ISO 835, Laboratory glassware Graduated pipettes ISO 1042, Laboratory glassware One-mark volumetric flasks ISO 3889IDF 219, Milk and milk products Specification of Mojonnier-type fat extraction flasks ISO 4788, Laboratory glassware Gra

36、duated measuring cylinders 3 Term and definitions For the purposes of this document, the following terms and definitions apply. 3.1 fat content of evaporated milk and sweetened condensed milk mass fraction of substances determined by the procedure specified in this International Standard NOTE The fa

37、t content is expressed as a percentage mass fraction. 4 Principle An ammoniacal ethanolic solution of a test portion is extracted with diethyl ether and light petroleum. The solvents are removed by distillation or evaporation. The mass of the substances extracted is determined. NOTE This is usually

38、known as the Rse-Gottlieb principle. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/05/2009 03:29, Uncontrolled Copy, (c) BSIBS EN ISO 1737:2008ISO 1737:2008(E) IDF 13:2008(E) 2 ISO and IDF 2008 All rights reserved5 Reagents Use only reagents of recognized analytical grade, unless otherwi

39、se specified, and distilled or demineralized water or water of equivalent purity. The reagents shall leave no appreciable residue when the determination is carried out by the method specified (see 9.2.2). 5.1 Ammonia solution, containing a mass fraction of NH3ofapproximately 25 % (20= 910 g/l). NOTE

40、 If ammonia solution of this concentration is not available, a more concentrated solution of known concentration may be used (see 9.4.2). 5.2 Ethanol (C2H5OH), or ethanol denatured by methanol, containing a volume fraction of ethanol of at least 94 %. (See Clause A.5.) 5.3 Congo red solution Dissolv

41、e 1 g of Congo red (C32H22N6Na2O6S2) in water in a 100 ml one-mark volumetric flask (6.14). Make up to the mark with water. NOTE The use of this solution, which allows the interface between the solvent and aqueous layers to be seen more clearly, is optional (see 9.4.3). Other aqueous indicator solut

42、ions can be used provided that they do not affect the result of the determination. 5.4 Diethyl ether (C2H5OC2H5), free from peroxides (see Clause A.3), containing no more than 2 mg/kg of antioxidants, and complying with the requirements for the blank test (see 9.2.2, Clauses A.1 and A.4). WARNING Th

43、e use of diethyl ether can lead to hazardous situations. Observe current safety precautions for handling, use, and disposal. 5.5 Light petroleum, with any boiling range between 30 C and 60 C or, as equivalent, pentane (CH3CH23CH3) with a boiling point of 36 C and complying with the requirements for

44、the blank test (see 9.2.2, Clauses A.1 and A.4). The use of pentane is recommended because of its higher purity and consistent quality. 5.6 Mixed solvent Shortly before use, mix equal volumes of diethyl ether (5.4) and light petroleum (5.5). 6 Apparatus WARNING Since the determination involves the u

45、se of volatile flammable solvents, all electrical apparatus employed shall comply with legislation relating to the hazards in using such solvents. Usual laboratory equipment and, in particular, the following. 6.1 Analytical balance, capable of weighing to the nearest 1 mg, with a readability of 0,1

46、mg. 6.2 Centrifuge, capable of holding the fat-extraction flasks or tubes (6.6) and capable of spinning at a rotational frequency of 500 min1to 600 min1to produce a radial acceleration of 80g to 90g at the outer end of the flasks or tubes. The use of the centrifuge is optional but recommended (see 9

47、.4.6). 6.3 Distillation or evaporation apparatus, for distilling the solvents and ethanol from the boiling or conical flasks, or evaporating from beakers and dishes (see 9.4.13) at a temperature not exceeding 100 C. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 18/05/2009 03:29, Uncontrolle

48、d Copy, (c) BSIBS EN ISO 1737:2008ISO 1737:2008(E) IDF 13:2008(E) ISO and IDF 2008 All rights reserved 36.4 Drying oven, electrically heated, with ventilation port(s) fully open, capable of being maintained at a temperature of 102 C 2 C throughout its working space. The oven shall be fitted with a s

49、uitable thermometer. 6.5 Water baths, capable of being maintained at a temperature of between 30 C and 40 C, and 40 C and 60 C. 6.6 Mojonnier-type fat-extraction flasks, as specified in ISO 3889IDF 219. NOTE It is also possible to use fat-extraction tubes with siphon or wash-bottle fittings, but then the procedure is different. The alternative procedure is given in Annex B. The fat-extraction flasks shall be provided with good quality cork bungs or stoppers of other material (e.g. silicone rubber or pol