Methylation GLC

(4) Older varieties of rapeseed oil, which contain the unusual fatty acid erucic acid (22:ln-9), have this fatty acid exclusively at positions l and 3, but none at position 2.

There are many other examples of stereo-specific distribution arising because of the specificity of the various transacylase enzymes responsible for the esterification of fatty acids at each of the gly-

cerol hydroxyl groups as discussed in Section 3.4.1.

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