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Adsorption kinetics of some carotenoids at the oil/water interface
- Source :
- Colloids and surfaces: B : biointerfaces
- Publication Year :
- 2004
- Publisher :
- Elsevier BV, 2004.
-
Abstract
- The kinetic analysis of the adsorption of two carotenoids (i.e., ethyl ester of beta-apo-8'-carotenoic acid and beta-carotene, all trans-isomers) from n-hexane solutions at the oil/water interface is presented for several carotenoid concentrations in the oil phase. A new kinetic approach is developed and it addresses the diffusion adsorption associated with a reversible interfacial reaction, which describes the reorientation of surfactant molecules between two conformations. This approach leads to a general analytical expression that contains four physical parameters and describes with high accuracy the experimental dynamic interfacial tensions for the two carotenoids, which independently adsorb from n-hexane phase to the n-hexane/water interface. The calculations give the characteristic times for the carotenoid adsorption at the oil/water interface in terms of diffusion relaxation and kinetic relaxation times. The results explain the long time effects on the adsorption of these carotenoids at the oil/water interface. The data are in substantial agreement with the molecular structure of these carotenoids and with the earlier data recorded for cholesterol adsorption at the n-heptane/water interface. Based on these findings, we propose a molecular mechanism for the interfacial transformation of carotenoid molecules at a hydrophobic/hydrophilic interface. (C) 2004 Elsevier B.V. All rights reserved.
- Subjects :
- Surface Properties
Diffusion
Kinetics
Colloid and Surface Chemistry
Adsorption
Pulmonary surfactant
Phase (matter)
Molecule
Organic chemistry
Physical and Theoretical Chemistry
Biology
Carotenoid
chemistry.chemical_classification
Physics
Relaxation (NMR)
Water
food and beverages
Surfaces and Interfaces
General Medicine
Models, Theoretical
beta Carotene
Carotenoids
Chemistry
chemistry
Chemical engineering
Oils
Biotechnology
Subjects
Details
- ISSN :
- 09277765
- Volume :
- 37
- Database :
- OpenAIRE
- Journal :
- Colloids and Surfaces B: Biointerfaces
- Accession number :
- edsair.doi.dedup.....52a379f841675b4f029631dd5b8e4379