title: Application of the desulfurization of phenothiazines for a sensitive detection method by high-performance liquid chromatography.
abstract: A simple and sensitive high-performance liquid chromatographic (HPLC) method for the determination of phenothiazine (PHE) is described. PHE is converted to diphenylamine (DIP) by desulfurization with Raney nickel catalyst. DIP is highly sensitive to electrochemical detection. The calibration graph for PHE quantification after desulfurization was linear between 0.1 and 2.0 ng per injection. The detection limit (signal-to-noise ratio = 3) of PHE after desulfurization was 10 pg, which is twenty times higher than that of the parent compound PHE. The proposed desulfurization technique was applied to other PHE-related compounds. The structural confirmation of the desulfurized product of PHE was carried out by LC-MS using atmospheric pressure chemical ionization.
authors.affiliation: Department of Analytical Chemistry, Niigata College of Pharmacy, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Shimada
authors.forename: T
authors.initials: T
authors.lastname: Mino
authors.forename: M
authors.initials: M
authors.lastname: Nakajima
authors.forename: H
authors.initials: H
authors.lastname: Wakabayashi
authors.forename: S
authors.initials: S
authors.lastname: Yamato
mesh_terms: D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004159:Diphenylamine / Q000032:analysis / Q000378:metabolism; D004563:Electrochemistry; D008401:Gas Chromatography-Mass Spectrometry; D010084:Oxidation-Reduction; D010640:Phenothiazines / Q000032:analysis* / Q000378:metabolism; D013455:Sulfur / Q000032:analysis* / Q000378:metabolism
chemical_list: D010640:Phenothiazines; D013455:Sulfur; D004159:Diphenylamine