Abstract
Different chiral cyclodextrin derivatives, dissolved in a polysiloxane matrix, have been used as enantioselective 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 a distinct chiral discrimination of these analytes. It was shown that the absorption and desorption kinetics of the two enantiomers of, e.g., methyl-2-chloropropionate are sufficiently different to produce sensor signal features that enable an accurate determination of the enantiomeric purity and of the enantiomeric composition of the chiral analyte or mixture under investigation.
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