Open AccessSYNTHESIS AND CHARACTERIZATION OF ALKYLPHENYL POLYGLYCOSIDIC SURFACTANTS FROM AMYLOSE AND ALKYL PHENOLS EXTRACTED FROM NATURAL CNSL
Author(s) -
Francisco Célio Feitosa de França,
Ethanielda de L. Coelho,
Antônia Flávia Justino Uchoa,
Francisco H. A. Rodrigues,
Maria Elenir Nobre Pinho Ribeiro,
Sandra de Aguiar Soares,
Nágila Maria Pontes Silva Ricardo
Publication year - 2016
Publication title -
química nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.214
H-Index - 73
eISSN - 1678-7064
pISSN - 0100-4042
DOI - 10.5935/0100-4042.20160090
Subject(s) - phenols , alkyl , amylose , chemistry , organic chemistry , characterization (materials science) , materials science , starch , nanotechnology
The surfactants were synthesized by condensing the obtained oligosaccharides of amylose and alkyl phenols extracted from the natural cashew nut shell liquid (nCNSL). The Nuclear Magnetic Resonance (NMR) and Fourier Transform Infrared Spectroscopy (FTIR) data showed aromatic ring bands, glycosidic rings, olefins and paraffins. The Nuclear Overhauser Effect Spectroscopy (NOESY) experiments showed that the conformation of the glycosidic units is of the type 4C1 with an α anomeric configuration. The values of Gibbs free energy of micellization (ΔGºmic) indicate that the spontaneity of formed micelles are cardanyl oligoglycosides > cardyl oligoglycosides > anacardyl oligoglycosides. The surface tension (γ) measurements showed that critical micelle concentration (cmc) values were low for surfactants. The study γ versus lnc (g dm-3) indicated that the aggregation behavior of the surfactants is dependent on their structural characteristics, as well as their thermal behavior. The area per molecule (A) values indicates that cardyl oligoglycosides are likely to form aggregates smaller than cardanyl oligoglycosides and anacardyl oligoglycosides. The critical packing parameter (cpp) indicates that the aggregates are of the vesicles and bilayers