BS-ISO-18395-2005.pdf
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1、BRITISH STANDARD BS ISO 18395:2005 Animal and vegetable fats and oils Determination of monoacylglycerols, diacylglycerols, triacylglycerols and glycerol by high-performance size-exclusion chromatography (HPSEC) ICS 67.200.10 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:46:18 GMT+00:00
2、 2006, Uncontrolled Copy, (c) BSI BS ISO 18395:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 7 July 2005 BSI 7 July 2005 ISBN 0 580 45921 7 National foreword This British Standard reproduces verbatim ISO 18395:2005 and implements it as
3、 the UK national standard. The UK participation in its preparation was entrusted to Technical Committee AW/307, Oil seeds animal present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related i
4、nternational 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 iii, a blank page, pages 1 to 10, an inside back cover and a back cover. The BSI copyright notice displayed in this doc
5、ument indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:46:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 18395:2005(E) INTERNATIONAL STANDARD ISO 18395 First edition 20
6、05-04-15 Animal and vegetable fats and oils Determination of monoacylglycerols, diacylglycerols, triacylglycerols and glycerol by high-performance size- exclusion chromatography (HPSEC) Corps gras dorigines animale et vgtale Dtermination de la teneur en monoacylglycrides, en diacylglycrides, en tria
7、cylglycrides et en glycrol par chromatographie liquide dexclusion (CLHP dexclusion) BS ISO 18395:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:46:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii BS ISO 18395:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:46:18 GMT+00
8、:00 2006, Uncontrolled Copy, (c) BSI iii 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 member b
9、ody 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 Electro
10、technical 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 adopted
11、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 patent r
12、ights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 18395 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 11, Animal and vegetable fats and oils. BS ISO 18395:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:46:18 GM
13、T+00:00 2006, Uncontrolled Copy, (c) BSI blank BS ISO 18395:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:46:18 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Animal and vegetable fats and oils Determination of monoacylglycerols, diacylglycerols, triacylglycerols and glycerol by high-
14、performance size-exclusion chromatography (HPSEC) 1 Scope This International Standard specifies a method for the determination of monoacylglycerols, diacylglycerols and triacylglycerols and also free glycerol by high-performance size-exclusion chromatography. It is applicable to products (e.g. emuls
15、ifiers) comprising monoacylglycerols and diacylglycerols as main constituents in concentrations ?10 %, and to triacylglycerols in a proportion of ? 20 %. The method is not applicable to dairy fats or fats and oils having a wide range of fatty acid chain lengths, since diacylglycerols of short fatty
16、acids have a lower molecular mass than monoacylglycerols of long-chain fatty acids. The method has restricted applicability to acylglycerol mixtures based on caprylic and capric acids. Here, only the monoacylglycerol content and the free glycerol content can be determined. NOTE References 1 to 4 giv
17、e background information. 2 Normative references The following referenced document is 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. IS
18、O 661, Animal and vegetable fats and oils Preparation of test sample 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 contents of monoacylglycerols, diacylglycerols, triacylglycerols and glycerol proportion of monoacylglycerols, diacylglycerol
19、s, triacylglycerols and glycerol determined under the conditions of this International Standard NOTE The contents are expressed as a mass fraction (grams per 100 g) or as a percentage of all peaks. 4 Principle The sample is dissolved in tetrahydrofuran (THF). The solution obtained is analysed by gel
20、 permeation chromatography (GPC) using THF as the mobile phase. The acylglycerols and glycerol are separated according to their molecular size. Detection is by means of a refractive index detector. BS ISO 18395:2005 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:46:18 GMT+00:00 2006, Unco
21、ntrolled Copy, (c) BSI 2 5 Reagents WARNING Attention is drawn to regulations concerning the handling of hazardous substances. Observe all technical, organizational and personal protective measures. Use only reagents of recognized analytical grade, unless otherwise specified. 5.1 Tetrahydrofuran (TH
22、F), stabilized with 250 l/l of BHT. 5.2 Standard substances 5.2.1Glycerol (w W 99,5 %). 5.2.2Monoacylglycerols, diacylglycerols, triacylglycerols1). Standards used should be monoacylglycerols, diacylglycerols and triacylglycerols having a fatty acid distribution as similar as possible to those prese
23、nt in the sample. However, the acylglycerol composition does not have to be reproduced exactly. For most samples, monopalmitate and/or monostearate and/or monooleate, dipalmitate and/or distearate and/or dioleate, tripalmitate and/or tristearate and/or trioleate are sufficient. The response factors
24、for glycerol, monoacylglycerols, diacylglycerols and triacylglycerols are generally the same under the conditions indicated in this International Standard, so that in most cases the use of quantitative reference solutions is unnecessary and percentages by area may be used. However, it is necessary t
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