Effect of the addition of a nonionic surfactant on the complex poly(asparagine)-cationic surfactant(360 views) Roscigno P, D'Auria G, Falcigno L, D'Errico G, Paduano L
Keywords: Cations Chemistry, Magnetic Resonance Spectroscopy, Molecular Structure, Peptides Chemistry, Surface Tension, Surface-Active Agents Chemistry, Molar Ratio, Nonionic Surfactants, Spatial Relation, Water Systems, Agglomeration, Ammonium Compounds, Complexation, Derivatives, Micelles, Polymers, Temperature Distribution, Surface Active Agents, Polyasparagine, Article, Chemical Structure, Nuclear Magnetic Resonance Spectroscopy,
Affiliations: *** IBB - CNR ***
Dipartimento di Chimica, Universita degli Studi di Napoli Federico II, Via Cinthia Monte S. Angelo, 80126 Napoli, Italy.
CSGI (Consorzio per lo Sviluppo dei Sistemi a Grande Interfase), Italy
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Effect of the addition of a nonionic surfactant on the complex poly(asparagine)-cationic surfactant
Poly(asparagine) (pAsn) at 0.1wt% in the presence of dodecyltrimethylammonium bromide (DTAB) and pentaoxyethylene octyl ether (CepsilonE5) at 1: 1 molar ratio leads to the formation of mixed DTAB/C8E5 micelle-like aggregates onto the polypeptide as a total surfactant critical association concentration (cac) is reached, as revealed by surface tension. measurements and NMR chemical shifts. Two-dimensional nuclear Overhauser enhancement spectroscopy (NOESY) capable of revealing spatial relationships among proximal protons has been performed on the pAsn-DTAB-C8E5-water system to study structural details of the surfactant-polypeptide aggregates. NOESY cross-peaks at sample temperature of 298.15 K indicate that the polypeptide interacts with the DTAB/C8E5 Micelle-like aggregates. The NOE intermolecular effects also show direct interactions between surfactant and polypeptide in the pAsn-DTAB-water system, whereas no interaction has been revealed in the pAsn-C8E5-water system. Furthermore, the experimental evidence suggest that the DTAB-polypeptide complex is mainly driven by the polar attraction between the two molecules.
Effect of the addition of a nonionic surfactant on the complex poly(asparagine)-cationic surfactant
No results.
Effect of the addition of a nonionic surfactant on the complex poly(asparagine)-cationic surfactant
Kállay C, Dávid A, Timári S, Nagy EM, Sanna D, Garribba E, Micera G, De Bona P, Pappalardo G, Rizzarelli E, Sóvágó I * Copper(II) complexes of rat amylin fragments(357 views) Dalton T (ISSN: 1477-9234, 1477-9226, 1477-9234electronic), 2011 Oct 14; 40(38): 9711-9721. Impact Factor:3.838 ViewExport to BibTeXExport to EndNote