Portilla-Arias, José A. and García-Alvarez, Montserrat and de Ilarduya, Antxon Martínez and Holler, Eggehard and Muñoz-Guerra, Sebastián (2006) Nanostructurated Complexes of Poly(β,L-malate) and Cationic Surfactants: Synthesis, Characterization and Structural Aspects. Biomacromolecules 7 (1), pp. 161-170.
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Other URL: http://dx.doi.org/10.1021/bm050490t
Ionic complexes of microbially produced poly(β,L-malic acid) and alkyltrimethylammonium surfactants with linear alkyl chains containing even numbers of carbon atoms from 14 up to 22, were investigated. Complexes with a stoichiometric or nearly stoichiometric composition were prepared by precipitation from equimolar mixtures of aqueous solutions of the two components. All complexes were found to adopt supramolecular stratified structures made of alternating layers of poly(β,L-malate) and surfactant with a periodicity on the length scale of 3-5 nm, which increased proportionally to the length of the polymethylene chain. In these complexes, alkyl side chains with more than 16 carbon atoms were partially crystallized showing reversible melting at temperatures between 40 and 70 °C. After melting, a smectic LC phase that isotropicized at ~100 °C was observed for all of the complexes. Conformational and dimensional changes taking place in the complexes by effect of heating were analyzed by 13C CP-MAS NMR and powder X-ray diffraction.
|Institutions:||Biology, Preclinical Medicine > Institut für Biophysik und physikalische Biochemie|
|Subjects:||500 Science > 570 Life sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Partially|
|Deposited On:||10 Jul 2006|
|Last Modified:||20 Jul 2011 20:47|