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A direct method for regiospecific analysis of TAG using alpha-MAG.

Lipids (2002-10-10)
F Turon, P Bachain, Y Caro, M Pina, J Graille
ABSTRACT

An analytical procedure was developed for regiodistribution analysis of TAG using alpha-MAG prepared by an ethyl magnesium bromide deacylation. In the present communication, the deacylation procedure is shown to lead to representative alpha-MAG, allowing the composition of the native TAG in the alpha-position to be determined directly. The composition in the beta-position can then be estimated from the composition of the alpha-MAG and TAG according to the formula 3 x TAG - 2 x alpha-MAG. The estimates are superior to those obtained using the alpha,beta-DAG and Brockerhoff calculations as they come closer to the theoretical value and have smaller SD. The present procedure, first demonstrated on a synthetic TAG, was then successfully applied to the analysis of borage oil, milkfat, and tuna oil.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Ethylmagnesium bromide solution, 3.4 M in 2-methyltetrahydrofuran
Sigma-Aldrich
Ethylmagnesium bromide solution, 1.0 M in THF
Sigma-Aldrich
Ethylmagnesium bromide solution, 40% in 2-methyltetrahydrofuran
Sigma-Aldrich
Ethylmagnesium bromide solution, 3.0 M in diethyl ether
Sigma-Aldrich
Ethylmagnesium bromide solution, 1.0 M in tert-butyl methyl ether