THE REACTION OF BAKER'S CHROMATE REAGENT WITH LIPIDS

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Abstract
The histochemical reaction of dichromate -acid hematein with sphingomyelin and lecithin has been confirmed; other phospholipids that do not contain choline do not react. Bromination does not prevent the reaction of these lipids with either chromate-acid hematein or chromate-diphenylcarbazone. Saturated lecithin reacts with acid hematein but less strongly than does unsaturated lecithin. It is suggested that the chromate-acid hematein reaction depends on the presence of the choline group of sphingomyelin and lecithin, but the intensity of the reaction is enhanced by the presence of unsaturated bonds. It is further suggested that chromium may react with the bromine-saturated bond either by a Grignard-like reaction or by formation of a [pi]-complex.

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