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Studies on chemical constituents of Glycyrrhiza pallidiflora

Chinese Pharmaceutical Journal.1999;(1):11-.

OBJECTIVE:To study the chemical constituents of Glycyrrhiza pallidiflora.METHOD:IR, 1 H-NMR,13C-NMR,MS and TLC were used to identify conpounds .RESULTS:Five compounds were elucidated as homopterocarpin,β-sitosterol,4＇,7-dimethoxyisoflavone,medicarpin and isoglabrol. CONCLUSION:The 4＇,7-dimethoxyisoflavone was first separated from this plant .

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Studies on esterase isozyme and peroxidase isozyme of Polyporus umbellatus

Qiuying WANG ; Jintang XU

Chinese Pharmaceutical Journal.1999;(1):9-.

OBJECTIVE:To study the change regular of esterase isozyme and peroxidase isozyme of Polyporus umbellatus. METHOD:Using polypropylene amide circle electrophoresis.RESULTS：The pattern and activity of isozyme in same strain had some difference at different culture days,but some of isozyme pattern bands of the Rf value were visible in whole culture stage.Every strain had its peculiar pattern bands.CONCLUSION:The number of isozyme pattern bands and enzyme activity were proportional to the growing rate of myceliun,as well as its metabolic activity.

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Enhanced dissolution of nimodipine from the preparations of the drug-PVP precipitates

Ganlin ZHAO ; Xiaobin SHEN

Chinese Pharmaceutical Journal.1999;(4):247-.

OBJECTIVE: To enhance the dissolution rate and efficacy of nimodipine (NMDP) which is a poorly water-soluble substance, and to design the formulations with fast-release properties. METHOD: NMDP-PVP-k30 coprecipitate and physical mixture were prepared. The physical states of NMDP in both newly-made and one-year-old samples were investigated by X-ray diffraction analysis. The dissolution rates of NMDP from coprecipitate and from physical mixture were also compared. Five formulations were prepared on the basis of NMDP-PVP-k30 coprecipitate and their in vitro drug dissolution behaviors were examined. Also, the dissolution property of the capsules with one selected composition was examined. The selected capsules were compared with two commercial tablets on their drug release processes. RESULTS: NMDP-PVP-k30 coprecipitate gave much higher improvement in the dissolution rate than the physical mixture, and NMDP was released 89% from the coprecipitate and 45% from the physical mixture in five minutes respectively. There was no appearance of crystallization in the coprecipitate after one year storage under experimental conditions. The tablet formulation with the highest drug dissolution rate was selected. The capsules with the same composition as the selected tablet showed a higher drug dissolution rate, which indicated that drug release property was influenced by the compressing pressure. The results showed that the dissolution rate of NMDP from the selected capsules was about three to four times of that from the two commercial tablets.CONCLUSION: The dissolution rate of NMDP can be improved greatly by coprecipitation using PVP-k30 as a carrier.

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The protective effects of OLA-PENa on experimental liver injury in rats

Lei WAN ; Xiufen CHEN ; Zhaohui JIANG

Chinese Pharmaceutical Journal.1998;(2):80-.

To investigate the protective effects of OLA-PENa on experimental hepatic injury in rats and compare it with OLA in the dose-response relationships. METHODS: Biochemical indexes and histopathological examination of hepatic injury in rats caused by toxicant chemicals ［D-galactosamine (D-Galn) and CCl4］ were determined. RESULTS: OLA-PENa obviously inhibited the rising of serum alanine transaminase (ALT) caused by D-Galn and CCl4 and dramatically decreased liver fat storage as well in a dose-dependent manner. Histopathological examination showed that OLA-PENa can evidently alleviate the condition of the degeneration of hepatic cells and that of necrosis. CONCLUSION: The protective effects of OLA-PENa on experimental liver injury in rats, all the mentioned effects, are more powerful than those of OLA with the same dosage.

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Determination of copper,zinc and maganese in Ejiao by derivative flame atomic absorption spectrometry

Zhaohui WANG ; Hanwen SUN ; Luming LI

Chinese Pharmaceutical Journal.1999;(4):227-.

OBJECTIVE:To determine the contents of Cu,Zn and Mn in Ejiao,a kind of Chinese traditional medicine.METHOD:The contents of Cu,Zn and Mn were determined by derivative flame atomic absorption spectrometry (DFAAS) after digested by HNO3-HClO4.RESULTS:The contents of Cu,Zn and Mn were 10.48,12.38 and 18.09μg.g-1 respectively.CONCLUSIONS:The DFAAS possesses higher sensitivities,lower detection limits and better precision.

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Comparison of bioassay and HPLC for the determination of levofloxacin in plasma

Kaiying SI ; Jingli DUAN ; Baoxia YAN

Chinese Pharmaceutical Journal.1999;(1):43-.

OBJECTIVE:The bioassay and HPLC methods were established and compared for the determination of levofloxacin(Lev) in human plasma.METHOD:In bioassay,medium Ⅱ and staphylococcus aureus were used.The HPLC method was chromatographed with a mobile phase of methanol-0.02mol/L potassium dihydrogen phosphate solution (3∶7)，the sample was treated by adding 30% trichloroacetic acid to precipitate protein,and detected at 276mm.RESULTS:The average recovery of bioassay was within 95.90%～106.68%,the within-day and day-to-day precisions were below 6%.The average recovery of HPLC was within 97.24%～101.70%,the within day and day-to-day precisions were blow 5%.Lev tablets were given to 6 patients in two ways.Drug concentrations in plasma were determined by bioassay and HPLC assay,respectively,with no significant difference (P＞0.05).CONCLUSION:The bioassay was simple,cheap,time saving,and reliable.The HPLC method wsa rapid,sensitive,accurate.The two methods may be selected to use in actual conditions.

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Effect of shell compositions on the dissolution rate of soft gelatin capsule shells

Xing TANG ; Zhonggui HE ; Yang YANG

Chinese Pharmaceutical Journal.1999;(1):28-.

OBJECTIVE:To study the relationship between various composition factors and the dissolution rates of the soft gelatin capsule shell.METHOD:The gelatin disk and gelatin shaped mass method were used by the current CP rotating-basket dissolution apparatus.The effects of shell compositions on the capsule shell dissolution rate were illustrated and discussed.RESULTS:With the increase in the ratio of gelatin glycerol in soft gelatin shell,the dissolution rate of the shell changed irregularly.After storage of 21 days at 40℃，the dissolution rate of the shell decreased at different extent.The dissolution rate of the shaped gelatin mass increased slightly by adding some polymers (pvp,starch).CONCLUSION:Am investigation of these factors and their influence on dissolution may be of assistance in the formulation of soft gelatin capsule shells for various purposes,THE SOFT gelatin capsules should be stored at relatively low temperature.

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Determination of riboflavin in salive

Junren ZHANG ; Hua PANG

Chinese Pharmaceutical Journal.1999;(2):122-.

OBJECTIVE:To observe the correlation of concentration-time curves of riboflavin in salive and plasma.METHOD:After peple orally taking riboflavin tablets,the riboflavin in salive was determinated by fluorescence spectrophotometry with excitation wavelength 475.4nm and emission wavelength 524.7nm.RESULTS:The recovery of riboflavin was over 96%.The detection limits of riboflavin was 5ng.ml-1,and the calibration curve was linear in the range of 5ng.ml-1～3μg.ml-1.The regression equation was △F′=0.116c+0.232(r=0.9999).CONCLUSION:The concentration-time curves of riboflavin in salive was similar to these in plasma.

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Simultaneous determination of ten psychosedatives in serum by TLC scanning

Yang ZHANG ; Yujing LIU

Chinese Pharmaceutical Journal.1998;(3):165-.

OBJECTIVE: Simulateous determination of ten psychosedatives in serum was made to help doctors make effective rescue. METHOD: The qualitative separation was done by TLC. The quantitative determination was made by TLC scanning. RESULTS: Ten psychosedatives were separated very well by one mobile phase. The recovery, accuracy and stability of TLC scanning on varied wave-lengths were satisfatory. CONCLUSION: This method is simple, rapid, and accurate. It can be used in poison analysis and therapeutic drug monitoring.

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Determination of netilmicin sulfate in serum by high performance liquid chromatography-indirect photometric determination method

Cheng YUAN ; Jingxiang WANG ; Wei GAO

Chinese Pharmaceutical Journal.1998;(4):235-.

OBJECTIVE: To determine the content of netilmicin sulfate in serum by a high performance liquid chromatography-indirect photometric determination (HPLC-IPD) method. METHOD: The chromatographic system consisted of Soheisorb C18 column and mobile phase of a solution of methyl alcohol-a buffer of phosphoric acid (pH=2.0) (20∶80), that contained 0.5 mmolL-1 of nicotinamide and 0.3 mmolL-1 of sodium seventhalkyl-sulphonate. The detected wave length was 268 nm. The serum simple of 4 patients was determined. RESULTS: The mean recovery of was 93.41% and detection limits was 50 μgL-1. CONCLUSION: The method is constant, sensitive, and has a good concentration. It is good for determination of netilmicin sulfate concentration in serum.

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