1. Propetamphos is an organophosphorus compound. Technical grade propetamphos consists of 4 isomers, 2 geometric (cis and trans) isomers and 2 optical (Sand R-)isomers. The cis form predominates as the active ingredient, usually exceeding 90% w/w of the technical material. From analogy with the chiral separation of propetamphos-oxon, cis-propetamphos is a racemate of equal proportions of the Sa...

We have explored the abilities of all-electronic DNA-carbon nanotube (DNA-NT) vapor sensors to discriminate very similar classes ofmolecules.We screened hundreds of DNA-NT devices against a panel of compounds chosen because of their similarities. We demonstrated that DNA-NT vapor sensors readily discriminate between series of chemical homologues that differ by single methyl groups. DNA-NT devic...

A simple and economical multi-channel optical sensor using corona discharge radical emission spectroscopy is developed and explored as an optical nose for discrimination analysis of volatile organic compounds, wines, and even isomers.

For the first time, relative distributions of optical and geometrical isomers in selected propylene glycol acetals are determined. Resolution of the four acetal isomers possible through the reaction of racemic propylene glycol (PG) with selected aldehydes is demonstrated. The four isomers are ascribed to the presence of syn and anti geometrical isomers for each optically active PG acetal enanti...