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EVS-EN ISO 12966-3:2010

Animal and vegetable fats and oils - Gas chromatography of fatty acid methyl esters - Part 3: Preparation of methyl esters using trimethylsulfonium hydroxide (TMSH)

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Kehtetu alates 05.07.2016
Alusdokumendid
ISO 12966-3:2009; EN ISO 12966-3:2009
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Standardi ajalugu

Staatus
Kuupäev
Tüüp
Nimetus
05.07.2016
Põhitekst
04.03.2010
Põhitekst
This part of ISO 12966 specifies a rapid base-catalysed transesterification method of fats and oils with trimethylsulfonium hydroxide (TMSH) to prepare fatty acid methyl esters. The method is exclusively applicable to the preparation of methyl esters of fats and oils for gas liquid chromatographic (GLC) analysis. It is applicable to all fats and oils including milk fat and blends containing milk fat. Isomerization of unsaturated fatty acids only occurs to a minor extent and isomerized fatty acids are only present at the determination limit. As isomerization takes place, the procedure is not recommended for conjugated linoleic acid (CLA). As CLA is not correctly analysed, this method is not applicable to the determination of the complete fatty acid composition of milk fat samples. Free fatty acids are only esterified to about 70 % to 80 %. In the case of conjugated cyclopropyl and cyclopropenyl fatty acids, side reactions may occur, but these do not interfere with the determination of the fatty acids.

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