BS-ISO-5765-2-2002.pdf
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1、BRITISH STANDARD BS ISO 5765-2:2002 Dried milk, dried ice-mixes and processed cheese Determination of lactose content Part 2: Enzymatic method utilizing the galactose moiety of the lactose ICS 67.100.10; 67.100.30; 67.100.40 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:39:59 GMT+00:00
2、 2006, Uncontrolled Copy, (c) BSI BS ISO 5765-2:2002 This British Standard, having been prepared under the direction of the Consumer Products and Services Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 8 October 2002 BSI 8 Oc
3、tober 2002 ISBN 0 580 40507 9 National foreword This British Standard reproduces verbatim ISO 5765-2:2002 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee AW/5, Milk and milk products, which has the responsibility to: A list
4、of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Corresponde
5、nce Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of its
6、elf confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and
7、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 14, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendment
8、s issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:39:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference numbers ISO 5765-2:2002(E) IDF 79-2:2002(E) INTERNATIONAL STANDARD ISO 5765-2 IDF 79-2 First edition 2002-09-01 Dried milk, dried ice-
9、mixes and processed cheese Determination of lactose content Part 2: Enzymatic method utilizing the galactose moiety of the lactose Lait sec, mlanges secs pour crmes glaces et fromages fondus Dtermination de la teneur en lactose Partie 2: Mthode enzymatique par la voie galactose BS ISO 57652:2002 Lic
10、ensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:39:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 57652:2002 ii Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:39:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-5675 O2:(2002)E ID-97 F2:(2002E) I SO 2002 All irthgs ersedevr ii
11、i Contents Foreword iv Foreword. v Introduction vi 1 Scope 1 2 Terms and definitions. 1 3 Principle . 1 4 Reagents 1 5 Apparatus. 3 6 Sampling 4 7 Procedure. 4 7.1 Test to check the procedure 4 7.2 Preparation of test sample. 4 7.3 Test portion 5 7.4 Reagent blank test 5 7.5 Deproteination. 5 7.6 De
12、termination 6 8 Calculation and expression of results 7 8.1 Calculation. 7 8.2 Expression of results 8 9 Precision 8 9.1 Interlaboratory trial . 8 9.2 Repeatability 8 9.3 Reproducibility 8 10 Test report 9 Annex A (normative) Good Laboratory Practice (GLP) rules for the performance of enzymatic anal
13、yses 10 Bibliography 14 BS ISO 57652:2002 iii Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:39:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-5675 O2:(2002)E ID-97 F2:(2002E) vi I SO 2002 All irthgs ersedevr Foreword ISO (the International Organization for Standardization) is a worldwi
14、de 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 tha
15、t 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 a
16、ccordance with the rules given in the ISO/IEC Directives, Part 3. 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 re
17、quires 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 part of ISO 5765IDF 79 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 5765-2IDF 79-
18、2 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 separately by AOAC International. ISO 5765IDF 79 consist
19、s of the following parts, under the general title Dried milk, dried ice-mixes and processed cheese Determination of lactose content: Part 1: Enzymatic method utilizing the glucose moiety of the lactose Part 2: Enzymatic method utilizing the galactose moiety of the lactose Annex A forms a normative p
20、art of this part of ISO 5765IDF 79. BS ISO 57652:2002 iv Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:39:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-5675 O2:(2002)E ID-97 F2:(2002E) I SO 2002 All irthgs ersedevr v Foreword IDF (the International Dairy Federation) is a worldwide fed
21、eration 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 development of standard methods of analysis
22、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 National Committees casting a vote. ISO 5765
23、-2IDF 79-2 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 separately by AOAC International. ISO 5765IDF 7
24、9 consists of the following parts, under the general title Dried milk, dried ice-mixes and processed cheese Determination of lactose content: Part 1: Enzymatic method utilizing the glucose moiety of the lactose Part 2: Enzymatic method utilizing the galactose moiety of the lactose All work was carri
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