DIFFERENTIAL DETECTION OF ENANTIOMERIC GASEOUS ANALYTES USING CARBON BLACK-CHIRAL POLYMER COMPOSITE, CHEMICALLY SENSITIVE RESISTORS

Carbon black-chiral polymer composites were used to provide diagnostic differential resistance responses in the presence of enantiomers of c hiral gaseous analytes, Vapors of (+)-2-butanol and (-)-2-butanol, (+) -alpha-pinene and (-)-alpha-pinene, (+)-epichlorohydrin and (-)-epichl orohydrin, and methyl (+)-2-chloropropionate and methyl (-)-2-chloropr opionate were generated and passed over a chemically sensitive carbon y((R)-3-hydroxybutyrate-co-((R)-3-hydroxyvalerate) butyrate-co-(R)-3-h ydroxyvalerate) (77% butyrate) composite resistor, Each enantiomer of a pair produced a distinct relative differential resistance change on the chiral detector, whereas both enantiomers of a set produced identi cal signals on achiral carbon black-poly(ethylene-co-vinyl acetate) (8 2% ethylene) detectors.