Gangliosides NeuAc-LacCer, NeuGc-LacCer, NeuLac-Sph and NeuAc-LacSphAc were analysed by FAB mass spectrometry in the negative ion mode. It is shown that this method gives valuable information on the structure of carbohydrate chains and fatty acid residues of the ganglioside molecules taking only micrograms of substances.

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