The time dependence of the interaction between dipalmitoyl-phosphatidylethanolamine (DPPE) and formaldehyde was determined at various pH values and temperatures by differential scanning calorimetry. The reaction products were separated with reversed-phase thin-layer chromatography. Formaldehyde decreased the main transition temperature and the enthalpy of DPPE and increased the peak half width. The interaction depended significantly on the grade of dissociation of the amino group of DPPE, it involves hydrogen bonding and chemical reactions. The chromatographic separations make probable that the methylation occurs consecutively from N-methyl-ethanolamine to N,N-dimethyl-ethanolamine.
|Number of pages||10|
|Publication status||Published - aug. 23 1990|
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