Premium
Pulsed field gradient NMR investigation of solubilization equilibria in amino acid and dipeptide terminated micellar and polymeric surfactant solutions
Author(s) -
Hickok Robin S.,
Wedge Seamus A.,
Hansen Alexandar L.,
Morris Kevin F.,
Billiot Fereshteh Haddadian,
Warner Isiah M.
Publication year - 2002
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1099
Subject(s) - chemistry , micelle , pulmonary surfactant , dipeptide , pulsed field gradient , chlorobenzene , polymer , mole fraction , toluene , micellar solutions , analytical chemistry (journal) , molecule , polymer chemistry , aqueous solution , organic chemistry , amino acid , biochemistry , catalysis
Pulsed field gradient NMR spectroscopy was used to investigate the association of toluene, chlorobenzene and benzyl alcohol with amino acid and dipeptide terminated polymerized surfactants (PS). The diffusion coefficient for each probe was measured in the presence and absence of the polymers and the mole fraction of bound probe molecules, f b , was calculated. For all solutions investigated, the probes associated more strongly with unpolymerized surfactant micelles than with corresponding PS. For example, the toluene f b values for association with sodium undecanoyl valinate micelles and the PS poly(sodium undecanoyl valinate) were 0.88 and 0.15, respectively. The relatively weak probe–polymer association was attributed to the polarity and fluidity of the polymers' hydrocarbon cores and to the fact that these PS have smaller aggregation numbers than the corresponding unpolymerized surfactant micelles. Copyright © 2002 John Wiley & Sons, Ltd.