Interactions between volatiles and lipids in complex systems |
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Authors: | M Le Thanh I Goubet J L Le Quere A Voilley |
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Affiliation: | 1. Laboratoire de Génie des Procédés Alimentaires et Biotechnologiques, Ecole Nationale Supérieure de Biologie Appliquée à la Nutrition et à l’Alimentation, 1 Esplanade Erasme, 21000, Dijon, France 2. Laboratoire de Recherches sur les Ar?mes, Institut National de la Recherche Agronomique, 21000, Dijon, France
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Abstract: | Partition equilibria of three aroma compounds in three different biphasic systems were studied by a liquid/liquid partition
technique to investigate interactions that occur between volatiles and lipids in biphasic solutions. The lipids used were
linoleic acid and ricinoleic acid and tetradecane as a model. The three aroma compounds were ethyl acetate, 2,5-dimethylpyrazine,
and oct-1-en-3-ol. The results showed that the intermolecular forces involved were weak. Infrared spectroscopy was then performed
on binary systems (tetradecane and linoleic acid or aroma compound) and on ternary systems (tetradecane, linoleic acid, and
aroma compound) to determine the nature of the interactions. This method confirmed the presence of hydrogen bonds between
linoleic acid and 2,5-dimethylpyrazine or oct-1-en-3-ol and also between molecules of oct-1-en-3-ol when the latter are present
at high concentrations in lipids. The observations provided sufficient information to explain the behavior of oct-1-en-3-ol
in biphasic solutions, but further work is needed to fully elucidate the nature of interactions between ethyl acetate or 2,5-dimethylpyrazine
and lipids and also to explain the behavior of these compounds in biphasic solutions. |
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Keywords: | Aroma compound fatty acids Fourier transform infrared spectroscopy interaction liquid/liquid partition coefficient tetradecane |
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