Résumé
Objective To establish a sensitive, rapid and simple high-performance liquid chromatography (HPLC) method for the determination of amphotericin B (AraB) and itraconazole (ITZ) in human cerebrospinal fluid (CSF). Methods Solid-phase extraction (SPE) was involved in sample preparation in this method, followed by reverse-phase separation under two different chromatographic systems. Results The tinearity for both AraB and ITZ ranged from 5 ng/mL to 100 ng/mL and the inter-day and intra-day RSD were both below 7.6% at the concentrations of 20,50 and 100 ng/mL. Conclusions The method we established has been applied to the therapeutic drug monitoring on cryptococcal-meningitis-infected patients who were given comedication of these two drugs.
Résumé
AIM To study the pharmacokinetics and bioavailability of clinafloxacin in rats. METHODS The drug concentration was determined by HPLC. The main pharmacokinetic parameters were obtained by 3P87 program. An RP-C18 was used as the stationary phase. The mobile phase was a mixture of acetonitrile-0.05 mol*L-1 citric acid triethylamine (pH 2.5) (20∶80). The flow rate was 1.0 mL*min-1. The UV absorbance detector was set at 300 nm. RESULTS A good linearity was obtained from 0.03-20 μg*mL-1 of clinafloxacin in rat plasma with γ=0.9998. The plasma concentration-time curve of clinafloxacin conformed to one compartment open model. After ig administration of 50 mg*kg-1 and 100 mg*kg-1 dose of clinafloxacin in six rats, mean Cmax and AUC values increased in proportion to dose. Mean T1/2 appeared to be independent of dose. Mean AUC was 65±6 and 27±4 μg*h*mL-1 respectively after iv and ig adminostration of 100 mg*kg-1 dose. The extent of bioavailability (F) of clinafloxacin was 42%. CONCLUSION The results of the pharmacokinetic study of clinafloxacin showed that it exhibited first order kinetic characteristics and the bioavailability is low.
Résumé
Object To determine the contents of schisantherin A, deoxyschizandrin, schisandrin B and schisandrin C in the stems and fruits of Schisandra rudriflora (Franch ) Rehd. et Wils , which were collected from different areas Methods An HPLC method was set up: Column, Sphereclone, ODS (250 mm?4 6 mm, 5 ?m); mobil phase, A: H 2O, B: MeOH; gradient elution was with 70% B from 0-4 min, 70%-100% B from 4-54 min; the flow rate was 0 4 mL/min; the column temperature was 25 ℃ and the DAD detector was used at 254 nm Results The contents of schisantherin A, deoxyschizandrin, schisandrin B and schisandrin C in S. rubriflora were 0.026%-0.083%, 0.007%-0.945%, 0.002%-0.121%, 0.010%-0.038%, respectively. Deoxyschizandrin exists widely in S. rubriflora and its content is higher in fruits than that in stems Conclusion Deoxyschizandrin is the main active lignan in the fruits of S rubriflora