CHIRAL DISCRIMINATION OF INHALATION ANESTHETICS AND METHYL PROPIONATES BY THICKNESS-SHEAR MODE RESONATORS - NEW INSIGHTS INTO THE MECHANISMS OF ENANTIOSELECTIVITY BY CYCLODEXTRINS
K. Bodenhofer et al., CHIRAL DISCRIMINATION OF INHALATION ANESTHETICS AND METHYL PROPIONATES BY THICKNESS-SHEAR MODE RESONATORS - NEW INSIGHTS INTO THE MECHANISMS OF ENANTIOSELECTIVITY BY CYCLODEXTRINS, Analytical chemistry, 69(19), 1997, pp. 4017-4031
The discrimination of the enantiomers of methyl lactate, methyl 2-chlo
ropropionate, and the inhalation anesthetics enflurane, isoflurane, an
d desflurane in the gas phase has been performed using thickness shear
mode resonators, The selective coating was a modified perpentylated g
amma-cyclodextrin derivative dissolved in a polysiloxane matrix. A new
model for the sorption of the chiral compounds into the cyclodextrin
cavities and into the polymer matrix was established for the purpose o
f characterizing the sensor responses; This characterization included
the fitting of the sensor responses (preferential and nonpreferential
sorption) according to the model and extracting the characteristic par
ameters. in particular we attempted to explain the observed variation
of the chiral discrimination factor a with changing analyte or cyclode
xtrin concentrations and search for an invariable parameter, character
istic for a certain analyte-cyclodextrin combination. The process of c
hiral or ''molecular'' recognition was thoroughly investigated.