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Gas chromatographic enantiomer separation of agrochemicals using modified cyclodextrins

✍ Scribed by König, Wilfried A. ;Icheln, Detlef ;Runge, Torsten ;Pfaffenberger, Bernd ;Ludwig, Peter ;Hühnerfuss, Heinrich

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
542 KB
Volume
14
Category
Article
ISSN
0935-6304

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✦ Synopsis

Abstract

The enantiomers of phenoxypropionic acid type herbicides have been resolved by capillary gas chromatography employing modified cyclodextrins as chiral stationary phases. Excellent separations were obtained with columns containing a 1:1 mixture of per‐O‐pentylated and per‐O‐methylated γ‐cyclodextrin.

The enantiomers of the methyl esters of mecoprop and dichlorprop were also resolved on octakis(3‐O‐butyryl‐2,6‐di‐O‐pentyl)‐γ‐cyclodextrin. On this phase the order of elution of the enantiomers was temperature‐dependent, the elution order being reversed as the temperature passed through the isoenantioselective temperature. This is the first time such behavior has been observed with cyclodextrin derivatives.

The enantiomers of the polychlorinated polycyclic pesticides cis‐ and trans‐chlordane, oxychlordane, heptachlor, heptachlorepoxide, and three chiral organophosphorus pesticides could be resolved using selectively derivatized cyclodextrin derivatives.

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