ABSTRACT
OBJECTIVE: To develop a supercritical fluid chromatography method for the separation of atorvastatin calcium and its enantiomer, meanwhile assaying the enantiomer. METHODS: Atorvastatin calcium and its enantiomer were separated on a ACQUITY UPC2 Trefoil CEL2 column(3.0 mm×150 mm, 2.5 μm) maintained at 45 ℃ with the mobile phase containing a mixture of CO2 and methanol with 0.1% TFA(78∶22, V/V) at 1.5 mL·min-1, and the detection wavelength was set at 244 nm. The back pressure was set at 13.8 MPa. RESULTS: The enantiomer and atorvastatin calcium were separated successfully in 5 min with a resolution factor of 4.1. Good linear relationship was established between the peak response and the concentration in the range of 2.5-50 μg·mL-1 for enantiomer(r2=0.999 9, n=6), the quantitative limit(S/N=10) was 2.5 μg·mL-1, and the detection limit(S/N=3) was 1.0 μg·mL-1. The spiked recovery of the enantiomer was 100.40%(n=9). CONCLUSION: The proposed method shows high accuracy, repeatability and stability. It can be employed for the quality control and stability research of the enantiomer of atorvastatin calcium.
ABSTRACT
Objective To investigate the effects of antihypertension and reversing left ventricular hypertro- phy by carvedilol or bisoprolol in patients with mild to moderate essential hypertension.Methods 40 cases of mild to moderate essential hypertension patients were selected for this random single-blind,paralleling controlled clinical study.Results Patients were randomized to take 12.5～25mg carvedilol tablet orlce daily or bisoprolol 2.5～5mg once daily if DBP was still in the range of 12.0～14.6kPa(90～110mmHg)after 2 weeks' placebo baseline. Carvedilol group included 20 cases,bisoprolol group included 20 cases,and the course was 24 weeks.Blood pressure and heart rate were measured and symptoms and signs were recorded.At the end of placebo and in 24 weeks heart ultrasound,blood routine,serum glucose,blood lipid,hepatic function and renal function were examined.SBP,DBP and heart rate of patients in two groups decreased obviously.There were significant differences between the two groups.Ventricular hypertrophy of carvedilol group improved than that in pretherapy.There were significant differ- ences between the two groups.Conclusion Carvedilol was well-tolerated with less side effects such as mild headache,tiredness,dizziness,slightly elevating of serum glucose.Carvedilol could well treat the mild moderate essen- tial hypertension effectively and safely by 12.5～25mg once daily.
ABSTRACT
In this study, the inhibitory effect of jujuboside A (JuA) on a penicillin sodium (Na-PCN) induced hyperactivity model was investigated. Cortical EEG (electroencephalogram) and the concentration of hippocampal Glutamate (Glu) were monitored simultaneously in vivo as indicators of rat's excitatory state. Power spectral density (PSD) and gravity frequency of PSD were calculated. JuA (0.05 g/L and 0.1 g/L) inhibited the EEG excitation effect caused by Na-PCN by increasing the power of delta1 and delta2 bands (P<0.01 vs model) and lowering the gravity frequency of PSD (P<0.01 vs model). JuA also remarkably reduced the Glu elevation induced by Na-PCN (P<0.05 vs model). Diazepam also depressed Glu concentration and lowered the gravity frequency, but it showed a different EEG pattern in increased beta2-activity (P<0.01 vs model). EEG excitation caused by Na-PCN correlated with Glu elevation during the first hour. Neurophysiological inhibitory effects of JuA and diazepam were more persistent than their Glu inhibitory effects.