Wolfgang Schoknecht

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d- and l-mandelic acid are separated by gas chromatography as isopropyl ester or isopropyl ester-isopropyl urethane on capillary columns, coated with Chirasil-Val. For its determination in urine the isopropyl ester procedure gives better results because other components of the urine do not cause interference. Thus d- and l-mandelic acid in the urine of(More)
The use of polysiloxanes as stationary phase in glass-capillary gas-chromatography carrying chiral groups enables the separation and quantitation of most amino-acid enantiomers and a variety of other compounds in a much shorter time than previously. This phase exhibits low volatility and high thermal stability and may be used in routine analysis with open(More)
A gas Chromatographic procedure for the determination of phenylethyleneglycol enantiomers and phenylethanol isomers is described and applied to the investigation of urine samples from occupationally styrene-exposed workers (11 males, six females) and an unexposed control group. Phenylethyleneglycol enantiomers and 2-phenylethanol were present in the urine(More)
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