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      https://www.ias.ac.in/article/fulltext/jbsc/004/04/0449-0454

    • Keywords

       

      [31P]-NMR; spin lattice relaxation; lecithin reverse micelles

    • Abstract

       

      [31P] -Nuclear magnetic resonance (NMR) spin lattice relaxation times (T1) have been measured for lecithin-nonpolar solvent-water as a function of added water for three solvents, namely, benzene, carbon tetrachloride and cyclohexane. In benzene and carbon tetrachloride systems, where spherical reverse micelles are formed, [31P]-NMR T1, values increase linearly with added water. However, in cyclohexane, the trends in the [31P]-T1 values indicate very different micellisation processes. Even at the lowest concentration of added water, the [31P]-T1 values in this solvent are substantially larger than the corresponding values in benzene and carbon tetrachloride, which is attributed to the intramolecular chlorinephosphate interaction being the weakest in cyclohexane. At a higher water content of six mols of water per mol of lecithin in cyclohexane solvent, the [31P]-T1 values show a sharp decrease indicating a sudden change in the dynamics of the phosphate group, and this confirms the on set of ‘reverse micelle-to-liquid crystalline’ phase transition observed in this system by other spectroscopic and physical techniques.

    • Author Affiliations

       

      V V Kumar1 P T Manoharan1 2 P Raghunathan1

      1. Department of Chemistry, Indian Institute of Technology, Kanpur - 208 016
      2. Regional Sophisticated Instrumentation Centre, Indian Institute of Technology, Madras - 600 036
    • Dates

       
  • Journal of Biosciences | News

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