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Étude des lipides chez la fourmiTapinoma simrothi phoenicea

Study of lipids in the antTapinoma simrothi phoenicea

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L'étude après silylation, de l'extrait éthéré des ouvrières de la fourmiT.s. phoenicea par chromatographie en phase gazeuse couplée à la spectrométrie de masse permet de mettre en évidence la présence des acides myristique, palmitique, linoléique, oléique et stéarique ainsi que celle du cholestérol. La structure de ces acides est également établie par chromatographie en phase gazeuse, en comparant les temps de rétention de leurs esters méthyliques avec ceux d'échantillons authentiques d'acides. Ces acides gras libres ne sont pas localisés au niveau des glandes pharyngiennes et leur répartition qualitative et quantitative chez la fourmiT.s. phoenicea est indépendante des castes. On montre que l'acide oléique est le constituant majeur (5,59%) et l'acide myristique est le constituant mineur (0,26%).

L'absence de l'acide formique qui n'est pas un acide gras a une valeur taxonomique.

Summary

Workers of the antT.s. phoenicea were extracted with ether and the ethereal extract was analysed using the combined GC/MS technique. The presence in this extract of myristic, palmitic, linoleic, oleic, stearic acid and of cholesterol is also confirmed by coinjection in gas chromatography.

It was found that the free fatty acids are not localized in the pharyngeal glands and their qualitative and quantitative distribution in the antT.s. phoenicea is caste independent.

Determination of the relative abundance of the free fatty acids and of cholesterol in the extract ofT.s. phoenicea indicates that oleic acid is the major constituent (5,59%) while myristic acid is the minor constituent (0,26%).

The absence of formic acid inT.s. phoenicea although it is not a fatty acid, is discussed from a taxonomic point of view.

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Hanna, N., El Bacha, R. & Hanna, R. Étude des lipides chez la fourmiTapinoma simrothi phoenicea . Ins. Soc 33, 206–210 (1986). https://doi.org/10.1007/BF02224598

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