title: Determination of roxithromycin in rat lung tissue by liquid chromatography-mass spectrometry.
abstract: A liquid chromatography-mass spectrometry (LC-MS) method for the determination of roxithromycin in rat lung tissue is described. Liquid-liquid extraction was adopted for sample preparation with recoveries from 72.5 to 76.9% at levels of 0.1, 5.0 and 20.0 microg/ml. Chromatographic separation was performed on a C18 column using a mixture of methanol, water and formic acid (80:20:1, v/v/v) as mobile phase delivered at a flow rate of 0.5 ml/min. Positive selected ion monitoring (SIM) mode was used for the quantification of roxithromycin at m/z 837.7 and clarithromycin (internal standard) at m/z 748.7. The linearity was obtained over the concentration range of 0.05-20.0 microg/ml and the lower limit of quantification was 0.05 microg/ml. For each QC level of roxithromycin, the intra- and inter-day precisions relative standard deviation (R.S.D.) were less than 4.1 and 7.5%, respectively, and accuracy (RE) was +/-10.0%. The proposed LC-MS method has been successfully used for the determination of roxithromycin in rat lung tissue after oral administration of roxithromycin formulations to 44 SD rats. The present study demonstrates that the concentration of roxithromycin in rat lung tissues can be significantly increased by ambroxol when they are formulated in combination.
authors.affiliation: Shenyang Pharmtech Institute of Pharmaceuticals, Shenyang 110016, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Meiling
authors.initials: M
authors.lastname: Qi
authors.forename: Xin
authors.initials: X
authors.lastname: Jin
mesh_terms: D000551:Ambroxol / Q000032:analysis / Q000737:chemistry; D000818:Animals; D000900:Anti-Bacterial Agents / Q000032:analysis / Q000737:chemistry; D002853:Chromatography, Liquid / Q000379:methods*; D004345:Drug Industry / Q000379:methods; D005100:Expectorants / Q000032:analysis / Q000737:chemistry; D008168:Lung / Q000187:drug effects* / Q000378:metabolism; D013058:Mass Spectrometry / Q000379:methods*; D008956:Models, Chemical; D008958:Models, Molecular; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D015575:Roxithromycin / Q000032:analysis* / Q000737:chemistry; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D000900:Anti-Bacterial Agents; D005100:Expectorants; D000551:Ambroxol; D015575:Roxithromycin