高效液相色谱法测定格列美脲片的含量

目的 采用高效液相色谱法测定降血糖新药格列美脲及其片剂含量。方法 Lichrospher ODS C18柱为色谱柱，乙腈-0．1％乙酸(50：50)为流动相，流量1．00ml／min，检测波长228nm。结果 试验日内差RSD为0．57％，n=15，日间差RSD为1.63％，n=15。线性范围12．5～400μg/ml，标准曲线：Y=71．583X 0．703，r=0．9997，检测限：0．1μg/ml。平均回收率为101．2％，RSD为1．89％，n=17。结论 本法准确、方便、可靠。测定结果满意，可作为格列美脲及其片剂含量测定方法。     

气相色谱法测定尼莫地平及其片剂含量

目的测定尼莫地平及其片剂含量。方法采用气相色谱法测定尼莫地平及其片剂含量。结果试验日内差平均RSD为0．86％,n=15,日间差平均RSD为1．84％,n=15。线性范围10-100μg／ml,标准曲线：Y=0．0605p＋2．03×10-3r=0．9994,检测限：1μg／ml。平均回收率为98．6％,RSD为1．32％,n=15。结论本法准确、方便、可靠。测定结果满意,可作为尼莫地平及其片剂含量测定方法。     

高效液相色谱法测定复方曲马多片含量

目的 :应用高效液相色谱法测定复方曲马多片含量。方法 :采用KromasilC18 柱 ,以非那西丁为内标 ,甲醇 -水 -三乙胺(55∶45∶0 2)为流动相 (冰醋酸调pH至4 2) ,检测波长为267nm ,流速0 7ml/min。结果 :曲马多线性范围为50～500μg/ml(r=0.9999 ,n=5) ;奈福泮线性范围为50～500μg/ml(r=0 9999 ,n=5)。曲马多平均回收率为99.69 % ,含量测定结果为100 71 % ,RSD=0.76 % (n=5) ;奈福泮平均回收率为99.76 % ,含量测定结果为99.64 % ,RSD=0.62 % (n=5)。结论 :本方法简便、快速、灵敏 ,结果准确。     

HPLC法测定克拉霉素及其片剂含量

建立了高效液相色谱法测定克拉霉素及其片剂含量的方法。色谱条件 :C18柱 ,流动相为 67mmol/ L磷酸二氢钾∶乙腈 ( 55∶ 4 5) ,检测波长选择 2 10 nm,外标法定量。结果 :线性范围为 10 0～ 90 0 μg/ ml,日内 RSD为0 .15%。片剂平均回收率为 10 0 .6% ( RSD为 0 .13% )。     

甲磺酸多沙唑嗪片剂的含量、含量均匀度和溶出度的测定

目的 :建立一种测定甲磺酸多沙唑嗪片剂的HLPC法 ,并用该方法测定甲磺酸多沙唑嗪片剂含量、含量均匀度和溶出度。方法 :色谱柱为DikmaC18(15 0mm× 4 6mm ,5 μm) ,流动相 :甲醇 -醋酸缓冲液 (5 2∶4 8,V/V) ;检测波长 2 5 0nm ;柱温 30℃。结果 :甲磺酸多沙唑嗪对照品溶液的线性方程为A =6 0 72 4c +1 94 1(n =7,r =1 0 0 0 ,线性范围 0 5～ 5 0mg·L-1) ,日内、日间RSD均 <2 % ,检测限为 2 5ng(rSN=3)。甲磺酸多沙唑嗪片剂含量在 10 1%～ 10 4 %之间 ,3批片剂 4 5min平均溶出度在 84 %～87%之间 ,含量均匀度A +1 8S <15。结论 :此法适用于甲磺酸多沙唑嗪片剂含量和溶出度测定     

HPLC法同时测定福辛普利钠片中福辛普利钠及其降解产物福辛普利拉的含量

目的 :建立同时测定福辛普利钠片中福辛普利钠及其降解产物福辛普利拉的高效液相色谱法。方法 :以 μ BondapakC18( 3 0 0× 4 .6mm ,1 0 μm)为分析柱 ,0 .8%三乙胺溶液 (用磷酸调节pH3 .0 ) 乙腈 ( 3 5∶65)为流动相 ,检测波长 :2 1 5nm ,峰面积内标法。结果 :回收率与线性范围分别为 (n =5) :福辛普利钠 ( 1 0 0 .3 % ,RSD =0 .3 7% ,50～2 50 μg/ml) ;福辛普利拉 ( 1 0 1 .8% ,RSD =0 .67% ,2 .5～ 1 2 .5μg/ml)。 结论 :本法简便 ,适合福辛普利钠片中福辛普利钠及其降解产物福辛普利拉的含量测定。     

高效液相色谱法测定常通口服液中大黄素的含量

目的 :测定常通口服液中大黄素的含量。方法 :采用高效液相色谱法 ,以Nova -PakC18 为色谱柱 ,甲醇 -0 1%磷酸 (85∶15)为流动相 ,检测波长为254nm。结果 :常通口服液中大黄素的含量在0 48～2 40μg/ml浓度范围内线性关系良好 (r=0 9998)。平均回收率为99 73 % (n=5) ,RSD=1 42 %。结论 :本方法简便、快速 ,测定结果准确。     

高效液相色谱法同时测定复方氧氟沙星滴耳液中2组分的含量

目的:建立以高效液相色谱法同时测定复方氧氟沙星滴耳液中氧氟沙星和醋酸地塞米松含量的方法。方法:色谱柱为XDB -C8,流动相为甲醇-磷酸二氢钾液(0 .02mol/L)并梯度洗脱,流速为1 0ml/min ,柱温为30℃,检测波长为240nm。结果:氧氟沙星、醋酸地塞米松检测浓度分别在100～500μg/ml、10～30μg/ml范围内线性关系良好,平均回收率分别为100. 6 % (RSD=0 .46 % ,n=9)、101 .3 % (RSD=0. 72 % ,n=9)。结论:本方法准确可靠、重现性好,可用于复方氧氟沙星滴耳液中氧氟沙星和醋酸地塞米松的含量测定。     

异丁司特原料及片剂含量测定方法的研究

目的 :研究高效液相色谱法和紫外分光光度法测定异丁司特原料及片剂的含量。方法 :高效液相色谱法和紫外分光光度法 ,在318nm波长处测定。结果 :高效液相色谱法测定异丁司特的线性范围为10～50μg/ml(r=1.0000,n=5) ,平均回收率为101 8 % ,RSD为2 1 % ;紫外分光光度法测定异丁司特的线性范围为4～12μg/ml(r=1.0000,n=5) ,平均回收率为101 6 % ,RSD为2 1 %。结论 :两种方法均准确、简单、快速 ,均适用于测定异丁司特含量     

复方美愈缓释片的高效液相色谱法分析

目的 :采用反相高效液相色谱法以程序变换控制记录积分衰减因子的方法 ,测定复方美愈缓释片中愈创木酚甘油醚和氢溴酸右美沙芬的含量。方法 :色谱柱为 Shimadzu VP-ODS(15 0 mm× 4.6mm) ,流动相为乙腈 -甲醇 -0 .0 1mol/ L 的三乙胺水溶液 (PH=3 .5 ) (18∶ 15∶ 67) ,检测波长 :2 76nm,流速为 1.0 ml/ m in。结果 :愈创木酚甘油醚和氢溴酸右美沙芬线性范围分别为 5 5 .9～ 782 .6μg/ ml和 4.2～ 5 8.8μg/ ml,平均回收率分别为 98.99% ,RSD1.2 % (n=7) ;10 2 .9% ,RSD 1.6% (n=7)。结论 :该方法可以用于美愈缓释片的含量测定     

Synthesis,Cytotoxicity and Antileishmanial Activity of Some N-(2-(indol-3-yl)ethyl)-7-chloroquinolin-4-amines

We report herein the condensation of 4,7-dichloroquinoline (1) with tryptamine (2) and D-tryptophan methyl ester (3) . Hydrolysis of the methyl ester adduct (5) yielded the free acid (6) . The compounds were evaluated in vitro for activity against four different species of Leishmania promastigote forms and for cytotoxic activity against Kb and Vero cells. Compound (5) showed good activity against the Leishmania species tested, while all three compounds displayed moderate activity in both Kb and Vero cells.     

Efficacy of gut lavage,hemodialysis, and hemoperfusion in the therapy of paraquat or diquat intoxication

Clinical and in vitro investigations were carried out to test the efficacy of gut lavage, hemodialysis, and hemoperfusion in the treatment of poisoning with paraquat or diquat. In a patient suffering from diquat intoxication 130 times more diquat was removed by gut lavage 30 h after ingestion than was removed by complete aspiration of the gastric contents.Determination of in vitro clearances for paraquat and diquat by hemodialysis showed that, at serum concentrations of 1–2 ppm, such as are frequently encountered in poisoning in man, toxicologically relevant quantities of herbicide cannot be removed from the body. At a concentration of 20 ppm, on the other hand, hemodialysis proved to be effective, the clearance being 70 ml/min at a blood flow rate of 100 ml/min. The efficacy of hemoperfusion with coated activated charcoal was on the whole better. Especially at concentrations around 1–2 ppm, the clearance values for hemoperfusion were some 5–7 times higher than those for hemodialysis.In a patient suffering from paraquat poisoning, both hemodialysis as well as hemoperfusion were carried out. The in vitro results could be confirmed: At serum concentrations of paraquat less than 1 ppm no clearance could be obtained by hemodialysis while by hemoperfusion with activated charcoal quite high clearance values were measured and the serum level dropped down to zero.

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Zusammenfassung Klinische Untersuchungen und Laboratoriumsversuche wurden durchgeführt, um die Wirksamkeit von Darmspülung, Hämodialyse und Hämoperfusion bei Paraquat- und Deiquat-Vergiftungen zu prüfen.Bei einem Patienten wurde 30 Std nach Deiquat-Aufnahme durch Darmspülung 130mal mehr Deiquat entfernt als durch vollständige Aspiration des Mageninhaltes. In vitro-Versuche ergaben, daß bei Blutserumkonzentrationen von 1–2 ppm, die bei Vergiftungen oft gemessen werden, durch Hämodialyse keine toxikologisch relevanten Paraquat- oder Deiquat-Mengen entfernt werden können. Dagegen erwies sich die Hämodialyse bei 20 ppm und einer Blutumlaufgeschwindigkeit von 100 ml/min mit einer Clearance von 70 ml/min als wirksam. Die Hämoperfusion mit beschicheter Aktivkohle war in diesen Versuchen aber eindeutig überlegen, denn insbesondere bei Konzentrationen um 1–2 ppm waren die Clearance-Werte 5–7mal höher als bei der Hämodialyse.Die in vitro-Ergebnisse wurden bei einem Patienten mit einer Paraquat-Vergiftung bestätigt: Bei Konzentrationen unter 1 ppm war die Hämodialyse wirkungslos, während durch Hämoperfusion relativ hohe Clearance-Werte erreicht wurden, so daß der Serumspiegel rasch unter die Nachweisgrenze abfiel.

     

In vitro studies on sterically stabilized liposomes (SL) as enzyme carriers in organophosphorus (OP) antagonism

This study describes a new approach for organophosphorous (OP) antidotal treatment by encapsulating an OP hydrolyzing enzyme, OPA anhydrolase (OPAA), within sterically stabilized liposomes. The recombinant OPAA enzyme was derived from Alteromonas strain JD6. It has broad substrate specificity to a wide range of OP compounds: DFP and the nerve agents, soman and sarin. Liposomes encapsulating OPAA (SL)* were made by mechanical dispersion method. Hydrolysis of DFP by (SL)* was measured by following an increase of fluoride ion concentration using a fluoride ion selective electrode. OPAA entrapped in the carrier liposomes rapidly hydrolyze DFP, with the rate of DFP hydrolysis directly proportional to the amount of (SL)* added to the solution. Liposomal carriers containing no enzyme did not hydrolyze DFP. The reaction was linear and the rate of hydrolysis was first order in the substrate. This enzyme carrier system serves as a biodegradable protective environment for the recombinant OP-metabolizing enzyme, OPAA, resulting in prolongation of enzymatic concentration in the body. These studies suggest that the protection of OP intoxication can be strikingly enhanced by adding OPAA encapsulated within (SL)* to pralidoxime and atropine.     

Lung disease and PKCs

The lung offers a rich opportunity for development of therapeutic strategies focused on isozymes of protein kinase C (PKCs). PKCs are important in many cellular responses in the lung, and existing therapies for pulmonary disorders are inadequate. The lung poses unique challenges as it interfaces with air and blood, contains a pulmonary and systemic circulation, and consists of many cell types. Key structures are bronchial and pulmonary vessels, branching airways, and distal air sacs defined by alveolar walls containing capillaries and interstitial space. The cellular composition of each vessel, airway, and alveolar wall is heterogeneous. Injurious environmental stimuli signal through PKCs and cause a variety of disorders. Edema formation and pulmonary hypertension (PHTN) result from derangements in endothelial, smooth muscle (SM), and/or adventitial fibroblast cell phenotype. Asthma, chronic obstructive pulmonary disease (COPD), and lung cancer are characterized by distinctive pathological changes in airway epithelial, SM, and mucous-generating cells. Acute and chronic pneumonitis and fibrosis occur in the alveolar space and interstitium with type 2 pneumocytes and interstitial fibroblasts/myofibroblasts playing a prominent role. At each site, inflammatory, immune, and vascular progenitor cells contribute to the injury and repair process. Many strategies have been used to investigate PKCs in lung injury. Isolated organ preparations and whole animal studies are powerful approaches especially when genetically engineered mice are used. More analysis of PKC isozymes in normal and diseased human lung tissue and cells is needed to complement this work. Since opposing or counter-regulatory effects of selected PKCs in the same cell or tissue have been found, it may be desirable to target more than one PKC isozyme and potentially in different directions. Because multiple signaling pathways contribute to the key cellular responses important in lung biology, therapeutic strategies targeting PKCs may be more effective if combined with inhibitors of other pathways for additive or synergistic effect. Mechanisms that regulate PKC activity, including phosphorylation and interaction with isozyme-specific binding proteins, are also potential therapeutic targets. Key isotypes of PKC involved in lung pathophysiology are summarized and current and evolving therapeutic approaches to target them are identified.     

Steroidal sapogenin contents in some domestic plants

In order to find out the values of the steroid resources for the future use. the compositions and contents of steroidal sapogenins from 13 domestic plants have been investigated. As a result,Dioscorea nipponica, D. quinqueloba andSmilax china were found to have large amount of diosgenin. And pennogenin inTrillium kamtschaticum andParis verticillata, yuccagenin inAllium fistulosum, hecogenin inAgave americana and neochlorogenin inSolanum nigum were appeared to be major steroidal sapogenins.