title: Semi-micro column high-performance liquid chromatography with UV detection for quantification of aspirin and salicylic acid and its application to patients' sera administered with low-dose enteric-coated aspirin.
abstract: A simultaneous determination of aspirin (ASA) and its metabolite, salicylic acid (SA), in human serum by a semi-micro column HPLC-UV was developed. A relatively small size of serum sample (100 microL) containing ASA and SA was cleaned up by a simple solid phase extraction. A good separation of ASA and SA could be achieved within 25 min using a semi-micro ODS column with an eluent of MeOH/0.7 mm phosphoric acid solution (pH 2.5) = 50:50 (v/v). The calibration curves for ASA and SA showed good linearity (r = 0.999) with the detection limits 114 and 38 ng/mL at a signal-to-noise ratio of 3, respectively. ASA and SA in patients' sera administered with low-dose enteric-coated aspirin were determined, and the concentration ranges obtained for ASA and SA were 1.2-2.2 and 0.5-57.3 microg/mL, respectively.
authors.affiliation: Department of Clinical Pharmacy, Course of Pharmaceutical Sciences, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Ohwaki
authors.forename: Tomoko
authors.initials: T
authors.lastname: Yamane
authors.forename: Takashi
authors.initials: T
authors.lastname: Ishimatsu
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Wada
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Nakashima
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001241:Aspirin / Q000008:administration & dosage* / Q000097:blood*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005260:Female; D006801:Humans; D007202:Indicators and Reagents; D008297:Male; D008875:Middle Aged; D020156:Salicylic Acid / Q000097:blood*; D052616:Solid Phase Extraction / Q000379:methods; D013056:Spectrophotometry, Ultraviolet; D013608:Tablets, Enteric-Coated / Q000008:administration & dosage
chemical_list: D007202:Indicators and Reagents; D013608:Tablets, Enteric-Coated; D020156:Salicylic Acid; D001241:Aspirin