title: High performance liquid chromatography equipped with a cathodic detector and column-switching device as a high-throughput method for a phosphatase assay with p-nitrophenyl phosphate.
abstract: LC coupled to an electrochemical detector (LC-EC) operating in cathodic mode with a column-switching system realizes a high-throughput detection of p-nitrophenol (NP). The measurement-time for each NP sample was shortened to 20 s, and the successive analyses of 39 samples was completed within 13 min. In the present system, the limits of detection and quantification were 0.15 and 0.20 microM, respectively, and further, up to 25 microM, a linear calibration curve was afforded. Relative standard deviations for standard solutions of 0.20, 1.0, and 25 microM NP were 4.3, 2.0, and 1.1% (n = 5), respectively. Between-run precisions of the analysis of 5.0 and 25 microM NP over 6 days were 4.8 and 1.3%, respectively. A comparison with the commonly used Bessey-Lowry-Brock method indicates that the present LC-EC is useful for the high-throughput assay of acid and alkaline phosphatases in urine and blood samples with a p-nitrophenyl phosphate substrate.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-Oka, Suita, Osaka 565-0871, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Yamauchi
authors.forename: Megumi
authors.initials: M
authors.lastname: Ido
authors.forename: Hatsuo
authors.initials: H
authors.lastname: Maeda
mesh_terms: D000135:Acid Phosphatase / Q000032:analysis*; D000469:Alkaline Phosphatase / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D009596:Nitrophenols / Q000032:analysis / Q000378:metabolism*; D009943:Organophosphorus Compounds / Q000378:metabolism*; D010100:Oxygen / Q000737:chemistry; D011786:Quality Control; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D009596:Nitrophenols; D009943:Organophosphorus Compounds; C008644:nitrophenylphosphate; D000469:Alkaline Phosphatase; D000135:Acid Phosphatase; D010100:Oxygen; C024836:4-nitrophenol