Effets de la formation de la pourriture acide sur la composition de la fraction lipidique des différentes parties du grain de Vitis vinifera cv. Fortana

On a etudie par comparaison la composition de la fraction lipidique des differentes parties de grains de Vitis vinifera sains et attaques par la pourriture acide. Des differences considerables ont ete revelees entre les extraits des differents types d'echantillons de pulpe + peau en ce qui concerne les parametres suivants: teneur en lipide, composition des triglycerides, composition des acides gras. Par contre, la fraction lipidique des deux echantillons de pepins etait tres semblable. Les composants principaux ainsi que leur repartition quantitative caracteristique correspondent aux resultats publies dans une etude precedente. On a mis en evidence l'aldehyde oleanoique qui n'etait presente que dans quelques echantillons de pulpe + peau en meme temps que l'acide correspondant et l'erythrodiol. Effects of sour rot on the composition of the lipid fraction of different parts of grapevine berries ( Vitis vinifera cv. Fortana) The composition of the lipid fraction of the various parts of berries of Vitis vinifera , healthy and infected by sour rot, have been compared. Notable differences became evident among the extracts of the various samples of pulp + skin with respect to the following parameters: lipid contens, composition of triglycerides and composition of fatty acids. The composition of the lipid fraction of the two samples of grape seeds, however, turned out to be very similar. The principal components and their quantitative distribution characteristics corresponded with the results reported in a preceding work. Oleanoic aldehyde has been identified which, together with the corresponding acid and erythrodiole, was only present in the samples of pulp + skin.