Reference number
ISO 21846:2018
International Standard
ISO 21846:2018
Vegetable fats and oils — Determination of composition of triacylglycerols and composition and content of diacylglycerols by capillary gas chromatography
Edition 1
2018-08
Read sample
ISO 21846:2018
71962
Published (Edition 1, 2018)
This publication was last reviewed and confirmed in 2024. Therefore this version remains current.

ISO 21846:2018

ISO 21846:2018
71962
Language
Format
CHF 96
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Abstract

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].

General information

  •  : Published
     : 2018-08
    : International Standard confirmed [90.93]
  •  : 1
     : 13
  • ISO/TC 34/SC 11
    67.200.10 
  • RSS updates

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