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- W1976886213 abstract "The accumulation of four bile salts at the interface between water and n-hexyl laurate is studied. Gibb's interfacial excesses of these salts are calculated, starting from interfacial tension measurements. At the same time, emulsions of the ester are treated by lipase and reactions rates are plotted against the bile salt concentrations present in the water phase of the emulsions. Inhibition by conjugated bile salts appear before the critical micellar concentration is approached. There is no defined relationship between this inhibition and the fraction of interfacial area covered by detergent molecules. In accordance with recent publication, the discussion suggests that the energy level of interfaces is important for lipase action and that, when interfacial tension becomes too small, lipase does not attach to interfaces and appears as inactive. On a étudié l'accumulation de quatre sels biliaires à l'interface entre l'eau et le laurate de n-hexyle, la valeur des excédents interfaciaux de Gibbs étant calculée à partir des tensions interfaciales. D'autre part, on a fait agir la lipase sur des émulsions de cet ester et on a suivi les variations de la constante catalytique en fonction de la concentration de sels biliaires qui est présente dans la phase aqueuse des émulsions. L'inhibition que provoquent les sels biliaires conjugués apparaît en-dessous de la concentration micellaire critique. La discussion montre qu'il n'existe pas de relation définie entre l'inhibition de la lipolyse et l'occupation de l'interface par les molécules de détergent. Elle suggère, en accord avec une récente publication, que la vitesse de réaction dépend de l'état énergétique des interfaces, la lipase ne s'attachant plus à ceux-ci quand la tension interfaciale devient trop petite." @default.
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- W1976886213 date "1976-10-01" @default.
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- W1976886213 title "Hydrolysis of an aliphatic monoester in emulsion by swine pancreas lipase: influence of interfacial bile salts molecules upon reaction rate" @default.
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- W1976886213 doi "https://doi.org/10.1016/s0300-9084(76)80280-5" @default.
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