Determination of the dopamine agonist rotigotine in microdialysates from the rat brain by microbore column liquid chromatography with electrochemical detection.
Rotigotine, an investigational dopamine agonist formulated as a patch, is being studied in Parkinson's disease. A microdialysis technique, in combination with microbore column liquid chromatography and electrochemical detection, was developed to monitor rotigotine levels in the brain. Microdialysis probes were inserted into the striata of anesthetized rats, and samples were collected during perfusion with Ringer's solution. Rotigotine was separated using a C18 reversed-phase column. The mobile phase consisted of 50mM Na(2)HPO(4) x 2H(2)O, 2.5 mM sodium octyl sulfonate, and pH 4.5; 35% volume to volume acetonitrile. The flow rate was 30 microl/min, and the potential of the glassy carbon electrode was set to +850 mV. The method allowed monitoring of the time course of brain extracellular rotigotine levels with a detection limit of 1 nM following either intravenous (0.5 mg/kg) or subcutaneous (5.0 mg/kg) rotigotine injection.
Kehr
Jan
J
Department of Physiology and Pharmacology, Karolinska Institutet, SE-171 77, Stockholm, Sweden.
Hu
Xiao-Jing
XJ
Yoshitake
Takashi
T
Scheller
Dieter
D
D000818:Animals; D001923:Brain Chemistry; D002853:Chromatography, Liquid / Q000379:methods*; D018491:Dopamine Agonists / Q000032:analysis*; D004563:Electrochemistry; D008297:Male; D017551:Microdialysis; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D013764:Tetrahydronaphthalenes / Q000032:analysis*; D013876:Thiophenes / Q000032:analysis*
D018491:Dopamine Agonists; D013764:Tetrahydronaphthalenes; D013876:Thiophenes; C047508:rotigotine