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    STUDIA CHEMIA - Issue no. 1 / 2004  
         
  Article:   RELAXATIONPHENOMENAINCAROTENOIDFILMS ATTHEOIL/WATERINTERFACE.

Authors:  MARIA TOMOAIA-COTISEL, PAUL JOOS.
 
       
         
  Abstract:  The kinetic analysis of the relaxation phenomena in carotenoid films adsorbed at the oil/water interface is presented for several carotenoid concentrations in the oil phase. A new kinetic approach is applied and it addresses the diffusion adsorption associated with a reversible interfacial reaction of reorientation of carotenoid molecules between two conformations The new model contains two characteristic times, i.e., diffusion relaxation and kinetic relaxation times and it describes with high accuracy the experimental data of dynamic interfacial tensions for the adsorption of two carotenoids: ethyl ester of  apo 8 carotenoic acid and -carotene, both all-trans isomers, from n-hexane phase to the n-hexane/water interface. The calculations give the two characteristic times for the relaxation phenomena in carotenoid adsorbed films at the oil/water interface. The data are in substantial agreement with the molecular structure of these carotenoids.  
         
     
         
         
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