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Des molécules de la biomasse vers des tensioactifs trimodulaires originaux

Abstract : The aims of this work concem the preparation, the physico-chemical and also biological evaluation, of trimodular surfactants resulting of biomass, for application in some various fields such as food industry (agrochemical, fermentation, feeding...), pharmaceutical and parapharmaceutical industry (cosmetic, emulsifier...) and nuclear power (complexation ofmetal.. .) The design of these new molecules is based on the principle of the modular synthesis. Two ways of synthesis are studied : they consist in imprecating, such as a game of "Lego", the polar module with the module of junction (lysin), then the hydrophobic modules or their derivatives and conversely. The first way of synthesis begins with the condensation of fatty acids or of their derivatives on lysin. Then, obtaining trimodular surfactants mono or bicatenary is carried out by grafting of an absorbent, standard module sugars or derived. The second strategy brings into play a primary condensation of a polar module on lysin. Then, various acids are grafted, in order to prepare 4 families of monocatenary surfactants and 2 families of bicatenary surfactants, with fatty chains being composed of 8 to 18 methylenes groups. The physico-chemical study of the synthesized products shows that the aqueous solutions of monocatenary surfactants present good properties of surface and form organized molecular systems. They can be used to form emulsions and should allow the preparation of blisters. The biological studies undertaken on these trimodular surfactants show that their additions in a culture medium of yeasts (Saccharomyces cerevisiae, Kluyveromyces bulgaricus and Saccharomyces bayanus) have repercussions on the growth, cellular breathing and the fermentation. We observe stimulative effects for some molecules or on the contrary inhibiting effects for others.
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Submitted on : Thursday, March 29, 2018 - 10:56:55 AM
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  • HAL Id : tel-01747303, version 1



Vanessa Alliot. Des molécules de la biomasse vers des tensioactifs trimodulaires originaux. Autre. Université Henri Poincaré - Nancy 1, 1999. Français. ⟨NNT : 1999NAN10304⟩. ⟨tel-01747303⟩



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