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    STUDIA CHEMIA - Issue no. 1 / 2005  
         
  Article:   MOLECULAR STRUCTURE AND MONOLAYER PROPERTIES OF SOME CAROTENOIDS.

Authors:  MARIA TOMOAIA-COTISEL, CSABA RACZ, GHEORGHE TOMOAIA, CÄ‚LIN FLOARE, ROBERT TOTOS, OANA PASCU, ANCA DUMITRU. 		 
       
         
  Abstract:  Compression isotherms of some carotenoids: 4-oxo-β-carotene, 4,4’-dioxo- β-carotene and the di-apo-4, 4’-carotenedial, spread at the air / water interface, are reported. The high molecular area portions of the compression isotherms are described by means of van der Waals – type state equation and interaction parameters are derived. Simple HMO calculations are performed without and with induction parameters and dipole moments are calculated. Surface properties viz. collapse pressure and surface compressibility modulus and interaction parameters are discussed in terms of dipole-dipole interactions, as well as of conformational analysis of the carotenoid molecules in monolayers in good agreement with the experimental results.  
         
     
         
         
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