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Structure and Properties of Stoichiometric Complexes Formed by Sodium Poly(alpha,L-glutamate) and Oppositely Charged Surfactants
Langmuir (1996)
  • William MacKnight, University of Massachusetts Amherst
  • Ekaterina A. Ponomarenko
  • Alan J. Waddon
  • David A. Tirrell
Abstract
The conformational and structural properties of the stoichiometric complexes formed by poly(a.,L­glutamate) anions and alkyltrimethylammonium cations with chain lengths of twelve, sixteen, and eighteen carbon atoms were examined by circular dichroism, infrared, differential scanning calorimetry, and X-ray diffraction techniques. The polypeptide chains complexed with the surfactants adopt a.-helical conformations. The shorter surfactant alkyl chains, consisting of twelve and sixteen carbon atoms, are disordered in the complexes, while the longer surfactant chains of eighteen carbon atoms crystallize on a hexagonal lattice. All of the complexes are organized in lamellar structures consisting of alternating layers of poly(a.,L­glutamate) chains separated by bimolecular layers of the surfactants. The surfactant alkyl chains are interdigitated and perpendicular to the lamellar surfaces. 
Keywords
  • Structure,
  • Properties,
  • Stoichiometric,
  • Complexes,
  • Sodium,
  • Poly(alpha L-glutamate),
  • Oppositely Charged Surfactants
Disciplines
Publication Date
1996
Citation Information
William MacKnight, Ekaterina A. Ponomarenko, Alan J. Waddon and David A. Tirrell. "Structure and Properties of Stoichiometric Complexes Formed by Sodium Poly(alpha,L-glutamate) and Oppositely Charged Surfactants" Langmuir Vol. 12 (1996) p. 2164 - 2172
Available at: http://works.bepress.com/william_macknight/205/