A direct method for regiospecific analysis of TAG using α-MAG
Turon, F. | Bachain, P. | Caro, Y. | Pina, M. | Graille, J.
An analytical procedure was developed for regiodistribution analysis of TAG using α-MAG prepared by an ethyl magnesium bromide deacylation. In the present communication, the deacylation procedure is shown to lead to representative α-MAG, allowing the composition of the native TAG in the α-position to be determined directly. The composition in the β-position can then be estimated from the composition of the α-MAG and TAG according to the formula, 3×TAG-2×α-MAG. The estimates are superior to those obtained using the α,β-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.
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