Further Studies on the Changes of Chicken Brain Gangliosides During Prenatal and Postnatal Life

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Abstract
The developmental profiles of the gangliosides and those of the fatty acids and long‐chain bases of the total ganglioside mixture of the brain of chicken were followed from the 10th day of incubation to the 63rd posthatching day. One O‐acetylated polysialoganglioside that seems specific of the earlier embryonic stage and up to 21 alkali‐stable components could be recognized by high‐resolution two‐dimensional TLC procedures and quantified by computer‐assisted two‐dimensional TLC densitometry. Besides a number of gangliosides identified by co‐chromatography with reference standards, 10 were of unidentified structure, and within these 4 did not belong to the gangliotetrahexosyl series. Throughout embryonic life, the ceramide portion of gangliosides was found to contain the long‐chain base species with 18 carbons. Those with 20 carbons, ∼10% of the total, were found to be present only after hatching.