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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Determination of xylometazoline in plasma and urine by gas chromatography using a fused-silica capillary column and an electron-capture detector.

A sensitive method is described for the determination of unchanged xylometazoline in plasma and urine at concentrations down to 35 nmol/l. After addition of naphazoline as an internal standard, both compounds are extracted with dichloromethane-diethyl ether (20:80) at pH 10, back-extracted with an acidic solution and re-extracted from a sodium hydroxide solution with dichloromethane-diethyl ether (20:80). The compounds are then derivatized with heptafluorobutyric anhydride in the presence of pyridine. The derivatives are determined by capillary gas chromatography using electron-capture detection.[1]

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