1、BRITISH STANDARD BS EN ISO 18395:2007 Incorporating amendment no. 1 (renumbers BS ISO 18395:2005 as BS EN ISO 18395:2007) Animal and vegetable fats and oils Determination of monoacylglycerols, diacylglycerols, triacylglycerols and glycerol by high-performance size-exclusion chromatography (HPSEC) Th
2、e European Standard EN ISO 18395:2007 has the status of a British Standard ICS 67.200.10 BS EN ISO 18395:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 7 July 2005 BSI 2007 ISBN 978 0 580 58467 1 National foreword This British Standard
3、is the UK implementation of EN ISO 18395:2007. It is identical with ISO 18395:2005. The UK participation in its preparation was entrusted to Technical Committee AW/307, Oil seeds animal m G is the mass of the glycerol in the sample, in milligrams, calculated from the calibration curve; m S is the ma
4、ss, in milligrams, of the test portion; F G is the response factor for glycerol. The mono-, di- and tri-acylglycerol contents are calculated in the same way. In the evaluation of the peak areas, a horizontal baseline is used as the integration boundary. The response factors for glycerol, monoacylgly
5、cerols, diacylglycerols and triacylglycerols are generally the same under the conditions indicated here, so that in most cases the use of quantitative reference solutions is unnecessary and the response factors are assumed to be F = 1. However it is necessary to determine a response factor for glyce
6、rol when the concentration in the sample is 3 %. In most cases, free fatty acids are not separated from the monoacylglycerol peak group. Therefore in samples with acid values 1 the amount of fatty acids, calculated from the acid value, may be subtracted from the monoacylglycerol content. This shall
7、be indicated in the test report. Report the result of the determination, expressed as a mass fraction in percent, to one decimal place. 11 Precision 11.1 Interlaboratory test Details of an interlaboratory test on the precision of the method are summarized in Annex B. The values derived from this int
8、erlaboratory test may not be applicable to concentration ranges and matrices other than those given. 11.2 Repeatability The absolute difference between two independent single test results, obtained using the same method on identical test material in the same laboratory by the same operator using the same equipment within a short interval of time, will in not more than 5 % of cases exceed the value of r given in Tables B.1 to B.5. EN ISO 18395:2007
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