OBJECTIVE:To study the mechanism of Cassia obtusifolia L in decreasing blood-lipid.METHODS:Primary cultures of rat hepatocytes in vitro were used to determine the concentrations of proteins in hepatocytes by the method of Folin-phenol reagent and to assay the cholesterol synthesis from 14 C-acetate with liquid scintillation count.RESULTS:Ex?tract of Cassia obtusifolia L inhibited cholesterol synthesis from 14 C-acetate,but cassiaside B didn't affect cholesterol synthe?sis.CONCLUSION:The mechanism of extract of Cassia obtusifolia L in decreasing blood-lipid may result from inhibition of cholesterol synthesis,but inhibiting cholesterol synthesis may be not the main approach of cassiaside B in decreasing blood-lipid.

Comparison of assays of immunoreactive insulin (IRI) and specific insulin in evaluating islet β cell function and insulin sensitivity suggested that there were no significant differences in individuals with different glucose tolerance impairment by two assays. The evaluation of islet β cell function using IRI and insulin sensitivity is still valid in clinical practice.

OBJECTIVE:To compare the relative bioavailability of 2 kinds of domestic oxaprozin enteric tablets.METHODS:20 healthy volunteers were administered with single oral dose of trial tablet 400g and reference tablet 400g by crossover design,whose plasma oxaprozin level was determined by HPLC.The pharmacokinetic parameters and bioavailability of oxaprozin enterosoluble tablets were calculated by 3p97 software.RESULTS:The pharmacokinetic parameters of tested enteric tablets vs.reference tablets were as follows,t 1/2?(73.468?24.354),(73.556?24.406)h,t max(13.275?8.012),(13.200?15.154)h,C max(44.283?7.535)、(45.429?15.107)?g/ml,AUC 0～Tn(4471.792?1387.724),(4234.328?1741.380)(?g?h)/ml,AUC 0～inf(5040.407?2092.744),(4858.292?2423.656)(?g?h)/ml;No significant differences were noted between 2 tablets.The relative bioavailability of tested tablet was(112.8?38.5)%.CONCLUSION:2 kinds of oxaprozin enterosoluble tablets were bioequivalent.

OBJECTIVE: To propose a HPLC method for quantitative assessment of cilostazol in human plasma. METHODS: Chromatogram column was C18(150mm?4.6mm, 5?m), mobile phases were acetonitrile-water(40∶60,V/V), the flow rate was 1.4ml/min,determined wavelength was 254nm. RESULTS: Cilostazol concentration was in the linear range of 25～2000ng/ml(r=0.9 999)with the lowest determinable concentration of 12.5ng/ml,recoveries of cilostazol from plasma were 99.99%～101.44%,the relative standard variation of intra-day and inter-day were 0.20%～2.90% and 0.19%～2.13%(n=5) respectively. CONCLUSIONS: This method is s simple, convenient, accurate, and applicable for study of pharmacokinetics of cilostazol in clinic.

0.05) . CONCLUSION: Ampicillin and probenecid capsules are of bioe-quiavailability.

OBJECTIVE :To develop a RP-HPLC method for determination of minocycline concentration in human plasma.METHODS:Chromatographic separation has been achieved on C18 column with acetonitrile-H2O-TFA(15∶85∶0.1)as the mobile phase, and oxytetracycline as internal standard.The detection wavelength was 350nm.The minocycline was extracted from buffered plasma(pH=6.5)by ethyl- acetate, and quantified by the ratio of minocycline peak area to that of internal standard.RESULTS :The linear range of minocycline detection concentration was 0.05～8?g/ml(r=0.9 999).The minimum detection concentration was 0.02?g/ml with an average recovery of 101.89% .The inter and intra-day RSD were both less than 5%.CONCLUSION :The present method is simple, rapid and accurate for determination of minocycline in human plasma.

Objective To develop a high performance liquid chromatography(HPLC) method to determine the concentration of ampicillin and probenecid in human plasma.Methods A Symmetry ShieldTM RP18 column(5 ?m,150 mm?3.9 mm)was used.The mobile phases were 0.068 mol/L KH_2PO_4(pH 3.0)∶acetonitre(92∶8,V/V)for ampicillin,H_2O∶acetonitrile∶1 mol/L KH_2PO_4∶1 mol/L acetic acid(59.5∶39.8∶0.62∶0.062,V/V,0.15% triethylamine added to reach pH 2.76) for probenecid.The detective wavelength were at 254 nm for probenecid and 210 nm for ampicillin.Results The calibration curves obtained were linear in the range of 0.625-20 ?g/ml (r=0.999 9) of probenecid and 1.25-40 ?g/ml of ampicillin.Conclusion This analysis method is simple,sensitive and rapid,suitable for studying pharmacokinetics of ampicillin and probenecid.

Objective To evaluate the effect of angiotensin Ⅱ ( Ang Ⅱ ),angiotensin- (1-7) [ Ang- ( 1-7 ) ],and co-action of Ang Ⅱ and Ang-( 1-7 ) on β cell insulin signaling pathway.Methods Mouse pancreatic β cell line NIT-1 was incubated with( 1 )0,10-7,10-6,10-s,10-4 mol/L concentrations of Ang Ⅱ for 24 h ; ( 2 )0,10-7,10-6,10 -5,10-4 mol/L concentrations of Ang- ( 1-7 ) for 24 h; ( 3 ) co-administration of Ang Ⅱ and Ang- ( 1-7 ) was divided into control,10-5mol/L Ang Ⅱ,10-6mol/L Ang-( 1-7 ),10-5mol/L Ang Ⅱ + 10-6mol/L Ang-( 1-7 ) group.Tyrosine phosphorylation of insulin receptor β subunit(IR-β-Tyr) and serine phophorylation of protein kinase B(Akt-Ser) were detected by Western blot.ResultsInsulin-stimulated IR-β-Tyr and Akt-Ser phosphorylation was significantly decreased in Ang Ⅱ 10-5 and 10-4 mol/L group; no significant changes in insulin-stimulated IR-β-Tyr and Akt-Ser phosphorylation were detected between Ang-( 1-7 ) treatment groups and control; Ang-( 1-7 ) blocked the inhibitory effect of Ang Ⅱ on Akt-Ser phosphorylation,yet exerted no effect on Ang Ⅱ-induced IR-β-Tyr phosphorylation inhibition.Conclusion Ang Ⅱ significantly inhibits insulin signaling pathway in β cell; Ang-( 1-7 ) reverts the inhibitory effect of Ang Ⅱ on insulin-stimulated Akt-Ser phosphorylation in β cell.

OBJECTIVE:To establish a RP-HPLC analytical method for the determination of pazufloxacin mesilate in human plasma and urine.METHODS:The plasma proteins were precipitated with methanol and the supernatant liquid ob-tained from the serum centrifugate was subjected to chromatographic analysis.The supernatant liquid obtained from the diluted urine centrifugate was subjected to sample introduction.The analytical column was Diamonsil C 18 ,the mobile phase consisted of acetonitrile-0.05mol/L potassium dihydrogen phosphate(containing1%tetrabutylammonium bromide)(8∶92,V/V)with a flow rate at1.4ml/min,excitation wavelength at320nm and emission wavelength at400nm.RESULTS:The linear range of pazufloxacin mesilate in both plasma and urine was31.25～10000ng/ml(r=0.9999).The relative recoveries of pazu-floxacin mesilate in human plasma and urine were97.77%～99.87%and98.31%～100.82%,respectively with RSD less than1.0%～3.0%.CONCLUSION:This method is accurate,reliable and simple and it is suitable for the pharmacokinetic study and routine monitoring of blood concentration of pazufloxacin mesilate.

This paper introduced the model of clinical pharmacists involving in pharmacy administration in Southwest Hospital.It features the following :1 .Establishment of the chief resident pharmacists mechanism , with clinical pharmacists involving in clinical drug treatment , therapy consultations and hospital‐wide consultations ;2 .Rational drug use quality control ,to supervise normative drug use of clinicians using the driver′s license management system for drug use;3 .Establishment of effective communication channels between physicians and pharmacists ,for mutual learning and supervision .Such model has helped clinical pharmacists to accumulate experiences in drug therapy ,and encouraged rational drug use .