title: Convenient and rapid determination of cimetidine in human plasma using perchloric acid-mediated plasma protein precipitation and high-performance liquid chromatography.
abstract: This study demonstrates the analysis of cimetidine in human plasma with HPLC using a simplified sample preparation by protein precipitation with perchloric acid. Plasma cimetidine concentration was determined by plotting peak height ratio of cimetidine to ranitidine (internal standard, IS) against cimetidine concentrations in plasma. The cimetidine and ranitidine peaks were completely separated and no interference from plasma was observed. The lower limit of quantification (LLOQ) of the method was established at 0.1 microg/mL with a precision of 4.3% and a relative error of 1.9%. The average analytical recovery was >90% over the range of cimetidine concentrations (0.1-15.0 microg/mL). The linearity of calibration curve was excellent (r(2) > 0.999). The within- and between-day precision and accuracy, expressed as the coefficients of variation and relative error, were found to be less than 5%. Compared with previously reported methods, the analytical technique for cimetidine determination in human plasma presented here demonstrates comparable accuracy and precision, an acceptable analysis time, shorter and simpler sample preparation, and a reduced need for complicated equipment. The method presented here is simple and rapid, and the precision and sensitivity are appropriate for the determination of cimetidine in plasma in pharmacokinetic studies.
authors.affiliation: Institute of Pharmaceutical Technology, Johann Wolfgang Goethe University, D-60438, Frankfurt am Main, Germany.
authors.forename: Ekarat
authors.initials: E
authors.lastname: Jantratid
authors.forename: Sompol
authors.initials: S
authors.lastname: Prakongpan
authors.forename: Joe P
authors.initials: JP
authors.lastname: Foley
authors.forename: Jennifer B
authors.initials: JB
authors.lastname: Dressman
mesh_terms: D001798:Blood Proteins / Q000737:chemistry*; D011232:Chemical Precipitation; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D002927:Cimetidine / Q000097:blood* / Q000493:pharmacokinetics; D006635:Histamine H2 Antagonists / Q000097:blood* / Q000493:pharmacokinetics; D006801:Humans; D008297:Male; D010472:Perchlorates / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D001798:Blood Proteins; D006635:Histamine H2 Antagonists; D010472:Perchlorates; D002927:Cimetidine