title: Determination of the pyridinium metabolite derived from haloperidol in brain tissue, plasma and urine by high-performance liquid chromatography with fluorescence detection.
abstract: A sensitive and selective method for the determination of the pyridinium metabolite (HPP+) derived from the antipsychotic drug haloperidol (HP) in brain tissue, plasma and urine using high-performance liquid chromatography with fluorescence detection is described. The HPP+ present in biological samples was extracted using a Sep-Pak C18 cartridge. Recoveries of HPP+ ranged from 78 to 90%. Final separation and quantitative estimations of HPP+ were achieved on a C18 reversed-phase column employing a mobile phase of acetonitrile-30 mM ammonium acetate (40:60, v/v) containing 10 mM triethylamine and adjusted to pH 3 with trifluoroacetic acid. The fluorescence detection utilized an excitation wavelength of 304 nm and an emission wavelength of 374 nm. Standard curves were linear in the range of 2.5-100 ng/ml for brain tissue homogenate and plasma samples and 10-500 ng/ml for urine samples. The detection limit of HPP+ was about 1 ng/ml in all biological samples. The concentrations of HPP+ in brain tissue, plasma and urine from HP-treated rats were determined using this method.
authors.affiliation: Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg 24061.
authors.forename: K
authors.initials: K
authors.lastname: Igarashi
authors.forename: N
authors.initials: N
authors.lastname: Castagnoli
mesh_terms: D000818:Animals; D001923:Brain Chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005453:Fluorescence; D006220:Haloperidol / Q000032:analysis* / Q000097:blood* / Q000652:urine*; D008297:Male; D011726:Pyridinium Compounds / Q000032:analysis* / Q000097:blood* / Q000652:urine*; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D011726:Pyridinium Compounds; D006220:Haloperidol