Chiral Sensing Using a Complementary Metal−Oxide Semiconductor-Integrated Three-Transducer Microsensor System

Different chiral cyclodextrin derivatives were dissolved in a polysiloxane matrix and have been used as sensitive coatings on a three-transducer microsystem including a calorimetric, a mass-sensitive, and a capacitive chemical sensor. Upon exposure to chiral analytes, such as methyl lactate and meth...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2009-11, Vol.81 (22), p.9353-9364
Main Authors: Kurzawski, Petra, Schurig, Volker, Hierlemann, Andreas
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Chromatographic methods and physical methods associated with chromatography
Cyclodextrins - chemistry
Exact sciences and technology
Gas chromatographic methods
General, instrumentation
Kinetics
Metals
Metals - chemistry
Models, Chemical
Oxidation
Oxides - chemistry
Oxygen
Semiconductors
Sensors
Sorption
Stereoisomerism
Thermodynamics
Transducers
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Summary:Different chiral cyclodextrin derivatives were dissolved in a polysiloxane matrix and have been used as sensitive coatings on a three-transducer microsystem including a calorimetric, a mass-sensitive, and a capacitive chemical sensor. Upon exposure to chiral analytes, such as methyl lactate and methyl-2-chloropropionate, all three transducers showed distinct chiral discrimination of these analytes. The signals were found to constitute a convolution of sorption thermodynamics and transducer-specific contributions, which included, in the case of the capacitive sensor, molecular orientation effects so that even opposite-sign signals for the two enantiomers resulted. The sensor response curves of all three transducers could be explained and fitted by applying a model that essentially implies the superposition of a Langmuir isotherm representing specific interactions, predominant at low concentrations, and a Henry isotherm for nonspecific physisorption. The results disclosed here show that, on the one hand, sensor techniques can be used to reveal details of enantioselective analyte−receptor or analyte−matrix interactions and that, on the other hand, sensors may provide an even more pronounced chiral discrimination (“discrimination enhancement”) with respect to sorption-thermodynamics-determined gas chromatography as a consequence of the transducer-specific signal contributions.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac9017007