Kinetic study of adsorption of some biocompounds at the oil/water interface |
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Authors: | Gheorghe Tomoaia Andrada Tomoaia-Cotisel Maria Tomoaia-Cotisel Aurora Mocanu |
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Institution: | (1) Department of Orthopaedic Surgery, “Iuliu Hatieganu” University of Medicine, 400028 Cluj-Napoca, Romania;(2) Department of Human Biology, Stanford University, P.O. Box 18390 Stanford, CA, 94309, USA;(3) Molecular/Structural Biotechnology, Membrane Thermodynamics and Biophysics, 254 Congressional Lane, 20852-1514 Rockville, MD, USA;(4) Department of Physical Chemistry, “Babes-Bolyai” University of Cluj-Napoca, 400028 Cluj-Napoca, Romania |
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Abstract: | The adsorption kinetics of some local anesthetics, like dibucaine and tetracaine, and of stearic acid from bulk solutions
at the oil/water interface was studied by using the pendent drop and ring methods. The anesthetics were dissolved in aqueous
solutions (pH 2), and the fatty acid was dissolved in benzene, each biocompound at several different concentrations in bulk
solutions. Kinetic equations for Langmuir mechanism of adsorption at oil/water interface were tested. The kinetic analysis
shows that Langmuir kinetic approach describes the dynamic interfacial pressures within the limits of the experimental errors
over a wide range of time and for different surfactant concentrations in bulk solutions. It is also concluded that this approach
allows the calculation of the ratio of the adsorption and desorption rate constants of these biocompounds at the oil/water
interface. Obtained results are in substantial agreement with earlier reported data for the surfactant adsorption as, well
as with their molecular structure. |
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Keywords: | Langmuir adsorption kinetics dynamic interfacial pressures dibucaine tetracaine stearic acid benzene/water interface |
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