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The fatty acid composition of total lipids from trypomastigote and amastigote forms of Trypanosoma cruzi and of Vero cells before and after parasite infection were analyzed by gas-liquid chromatography and mass spectrometry. Even-numbered, saturated, monoenoic and polyenoic acids ranging from C-12 to C-18 were characterized in both T. cruzi development stages. Significant changes in the fatty acid composition occurred during the T. cruzi life cycle. Oleic and linoleic acids were prominent in trypomastigote forms, whereas palmitic acid was the major fatty acid of amastigotes. Other differences include higher stearic acid and lower palmitoleic and linolenic acid levels as well as the absence of lauric acid in amastigotes as compared with trypomastigote forms. The fatty acid pattern of Vero cells before T. cruzi infection as compared with that after infection showed mostly qualitative differences. Linoleic and linolenic acids were observed only in T. cruzi infected cells.
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