Portilla-Arias, Jose A. and Garcia-Alvarez, Montserrat and de Ilarduya, Antxon Martinez and Holler, Eggehard and Munoz-Guerra, Sebastian (2006) Nanostructurated complexes of poly(beta,L-malate) and cationic surfactants: Synthesis, characterization and structural aspects. BIOMACROMOLECULES, 7 (1). pp. 161-170. ISSN 1525-7797, 1526-4602
Full text not available from this repository. (Request a copy)Abstract
Ionic complexes of microbially produced poly(beta,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(3,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 degrees C. After melting, a smectic LC phase that isotropicized at similar to 100 degrees C was observed for all of the complexes. Conformational and dimensional changes taking place in the complexes by effect of heating were analyzed by C-13 CP-MAS NMR and powder X-ray diffraction.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BIOSYNTHETIC POLY(GAMMA-GLUTAMIC ACID); SIDE-CHAIN CRYSTALLINITY; MELTING TRANSITIONS; HOLLOW SPHERES; ALKYL ESTERS; POLYPEPTIDES; BEHAVIOR; FUSION; HEATS; |
| Subjects: | 500 Science > 570 Life sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Biophysik und physikalische Biochemie > Alumni or Retired > Prof. Dr. Eggehard Holler |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Mar 2021 09:19 |
| Last Modified: | 01 Mar 2021 09:19 |
| URI: | https://pred.uni-regensburg.de/id/eprint/35081 |
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