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BS ISO 21846:2018

BS ISO 21846:2018

$102.76

Vegetable fats and oils. Determination of composition of triacylglycerols and composition and content of diacylglycerols by capillary gas chromatography

Published By Publication Date Number of Pages
BSI 2018 20
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This document specifies the determination of composition of triacylglycerols and the determination of the composition and content of diacylglycerols by capillary gas chromatography in vegetable oils with a lauric acid content below 1 %.

Applying certain technological processing 1,2-diacylglycerols (1,2-DAGs) are transformed to the more stable isomeric 1,3-diacylglycerols (1,3-DAGs) due to acidic catalysed reaction. During storage, the speed and amount of this rearrangement depends on the acidity of the oil. The transformation normally reaches an equilibrium between the two isomeric forms. The relative amount of 1,2-DAGs is related to oil freshness or to a possible technological treatment. Therefore, it is possible to use the ratio of 1,2-DAGs to 1,3-DAGs as a quality criterion for vegetable fats and oils.

The triacylglycerols profile is of potential interest for the fingerprint of each vegetable oil and may help the detection of certain types of adulteration, such as the addition of high oleic sunflower oil or palm olein in olive oil.

NOTE This document is based on Reference [3].

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 1 Scope
2 Normative references
3 Terms and definitions
4 Principle
8 5 Apparatus
5.10 Usual laboratory glassware.
6 Reagents
6.2 Auxiliary gases:
6.4 n-Heptane.
6.6 Methyl tert-butyl ether.
9 7 Procedure
7.1 Gas chromatographic apparatus and capillary column condition
7.2 Choice of operating conditions
7.3 Performance of the analysis
7.4 Peak identification
10 7.5 Determination of percentage content of each triacylglycerol class
7.6 Determination of percentage content of each 1,2 diacylglycerol
7.7 Determination of weight percentage total content of diacylglycerols
8 Expression of results
11 9 Precision of the method
9.1 Repeatability, r
9.2 Reproducibility, R
10 Test report
12 Annex A (informative) Examples of a typical chromatograms
17 Annex B (informative) Results of an interlaboratory test
19 Bibliography

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BS ISO 21846:2018
$102.76