Release of isoamyl acetate from starch pastes of various structures: thermodynamic and kinetic parameters.
The release of isoamyl acetate from starch-based matrices was studied on the basis of a cumulative dynamic headspace analysis. Two corn starches were compared, which are known to yield pastes and gels differing in their structures and properties. These properties were assessed by viscometry and viscoelastic measurements. Aroma release was discussed as a function of the structure and texture parameters of the matrix. The release curves obtained from water and from the various starch-based matrices at 25 degrees C showed similar patterns but differed in their initial slopes and in the final plateau values. The lowest initial slopes were obtained for the normal starch dispersions that formed gels due to amylose gelation. The aroma compound was entirely released from water and from the waxy starch pastes. A significant amount of isoamyl acetate remained trapped in the normal starch dispersions.
Cayot
Nathalie
N
Unité Mixte de Recherche Arômes INRA/ENESAD, 17 rue Sully, B.P. 86510, 21079 Dijon Cedex, France. n.cayot@enesad.fr
Pretot
Fanny
F
Doublier
Jean-Louis
JL
Meunier
Jean-Marie
JM
Guichard
Elisabeth
E
D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004548:Elasticity; D007700:Kinetics; D009812:Odorants / Q000032:analysis*; D000439:Pentanols / Q000032:analysis*; D013213:Starch / Q000737:chemistry*; D013816:Thermodynamics; D014783:Viscosity
D000439:Pentanols; D013213:Starch; C020377:isoamyl acetate