BS-ISO-15154-2003.pdf
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1、BRITISH STANDARD BS ISO 15154:2003 Tobacco Determination of the content of reducing carbohydrates Continuous-flow analysis method ICS 65.160 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 15154:2003 This British Standard was publis
2、hed under the authority of the Standards Policy and Strategy Committee on 16 May 2003 BSI 16 May 2003 ISBN 0 580 41890 1 National foreword This British Standard reproduces verbatim ISO 15154:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to
3、Technical Committee AW/40, Tobacco and tobacco 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 international publications referred to in this document
4、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 include all the necessary provisions of a contract. User
5、s 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 enquiries on the interpretation, or proposals for change,
6、 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 v, a blank page, pages 1 to 7 and a back cover. The BSI copyright
7、 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 03:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI NITENRATIONAL TSDNARAD OSI 45151 iFtsr deoitin 23001-40-5
8、 Reference number ISO 15154:2003(E) Tobacco Determination of the content of reducing carbohydrates Continuous-flow analysis method Tabac Dtermination de la teneur en hydrates de carbone rducteurs Mthode par analyse en flux continu INTERNATIONAL STANDARD ISO 15154 First edition 2003-04-15 Refecnern e
9、mureb OSI 15145002:)E(3 Tooccab eD nimretoitao nf hte tnoctne fo ercudc gniahobrdyarset noCtniuolf-suoa wnlam sisyehtdo Tacab etDrmnioitad nl enet arue eh nydrseta dc eranobe rcuduetrs htMedo rap alansye lf nexu citnonu BS ISO 15154:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:29:5
10、2 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO :45151(3002)E ii BS ISO 15154:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 51513002:4)E( iii Contents Page 1Scope 1 2Principle 1 3Reagents . 1 4Apparatus . 2 5Procedure . 3 6Calcul
11、ation . 3 7Repeatability and reproducibility . 4 8Test report 4 Annex A (informative) Prevention of precipitation of PAHBAH 5 Annex B (informative) Example of continuous-flow analyser 6 Bibliography . 7 BS ISO 15154:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:29:52 GMT+00:00 2006,
12、 Uncontrolled Copy, (c) BSI ISO :45151(3002)E iv 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
13、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
14、 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
15、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
16、patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 15154 was prepared by Technical Committee ISO/TC 126, Tobacco and tobacco products, Subcommittee SC 2, Leaf tobacco. BS ISO 15154:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:29:52 G
17、MT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 51513002:4)E( v Introduction A CORESTA1) Task Force studied the various widely used procedures for the determination of reducing sugars in tobacco in order to adopt one of them as the CORESTA Recommended Method. Two procedures were adopted as ISO 15153 a
18、nd this International Standard. Studies carried out by the CORESTA Task Force between 1989 and 1993 have shown that the two methods may not produce identical results. For some tobaccos the results obtained with the method given in ISO 15153 are higher than those of the method in this International S
19、tandard, because the latter is sensitive to interferences from reducing substances, other than sugars, present in tobacco. Collaborative studies have shown that when extracting with distilled water, hydrolysis of sucrose occurs with some tobaccos. 1)CORESTA: Cooperation Centre for Scientific Researc
20、h Relative to Tobacco. BS ISO 15154:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI . iv Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:29:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ANRETNIITOTS LANDNADRAISO 51513002:4)E(
21、1 Tobacco Determination of the content of reducing carbohydrates Continuous-flow analysis method 1Scope This International Standard specifies a method for the determination of the content of reducing carbohydrates in tobacco by continuous-flow analysis. This method is applicable to manufactured and
22、unmanufactured tobacco. 2Principle A tobacco extract in acetic acid solution is prepared and the content of reducing carbohydrates in the extract is determined by reaction with p-hydroxybenzoic acid hydrazide. In alkaline medium at , a yellow osazone is formed which has an absorption maximum at . 3R
23、eagents All reagents shall be used according to good laboratory practice and existing national regulations. Use distilled water or water of at least equivalent purity. 3.1Polyoxyethylene lauryl ether (Brij 35 solution). Add 1 litre water to of Brij 35. Warm and stir until dissolved. 3.2Sodium hydrox
24、ide solution, . Prepare 1 litre of sodium hydroxide from ampoules or dissolve of sodium hydroxide in of water. Mix and allow to cool. After total dissolution, add of Brij 35 solution (3.1) and dilute to 1 litre with water. 3.3Calcium chloride solution, . Dissolve calcium chloride hexahydrate in wate
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