HPLC法同时测定口腔溃疡液中3组分的含量

目的:建立HPLC法同时测定口腔溃疡液中氯霉素、醋酸地塞米松及盐酸丁卡因等3组分的含量。方法:色谱柱采用Kromasil C₁₈柱（250mm×4.6mm,5μm）,甲醇-水-乙腈（45:45:10）（含0.02%庚烷磺酸钠,0.34%磷酸二氢钾,用三乙胺调pH至6.5）为流动相。检测波长240～340nm。结果:氯霉素在8.527-25.581mg·ml^-1（r=0.9992）,醋酸地塞米松在0.127～0.381mg·ml^-1（r=0.999 9）,盐酸丁卡因在5.014～15.019mg·ml^-1（r=0.9992）浓度范围内线性关系良好。氯霉素的平均回收率为99.16%,RSD为0.47%;醋酸地塞米松的平均回收率为99.03%,RSD为0.62%;盐酸丁卡因的平均回收率为100.40%,RSD为1.16%。结论:该方法具有操作简便,结果准确的优点,可用于口腔溃疡液中的氯霉素、醋酸地塞米松及盐酸丁卡因的质量控制。     

反相高效液相色谱法测定口腔溃疡涂剂中甲硝唑和盐酸丁卡因的含量

目的：建立以反相高效液相色谱法测定口腔溃疡涂剂中甲硝唑和盐酸丁卡因含量的方法。方法：色谱柱为Thermo ODS hypersilC18（50mm×4．6mm，5μm）；流动相为甲醇-水-乙腈-三乙胺（35：50：15：0．7）（用冰醋酸调pH=6．8）；流速1．0ml·min^-1；检测波长为310nm；柱温20℃。结果：甲硝唑和盐酸丁卡因分别在20．2～161．6μg·ml^-1（r=0．9994）和6．68～53．44μg·ml^-1（r=0．9993）范围内线性关系良好，平均回收率分别为99．89％（RSD0．62％）和99．84％（RSD0．67％）。结论：本法简便、快速、重复性好，可用于口腔溃疡涂剂的质量控制。     

HPLC快速柱用于盐酸丁卡因制剂的含量测定

采用HPLC快速柱同时测定盐酸丁卡因及其分解物对丁氨基苯甲酸的含量。在0.08～0.24mg/ml(0.16～1.60μg/ml)范围内盐酸丁卡因(对丁氨基苯甲酸)浓度与峰面积成良好线性关系。盐酸丁卡因的方法回收率为100.23%,CV=0.27%;对丁氨基苯甲酸的方法回收率为99.97%,CV =1.11%。     

紫外分光光度法测定盐酸丁卡因注射液的含量

采用紫外分光光度法测定盐酸丁卡因注射液的含量，其测定波长为３１０±１ｎｍ，平均回收率９９．２５％，变异系数０．７７％。此法准确、快速、重现性好、操作方便，适用于医院制剂的含量测定。     

多元线性模型预测药物的稳定性

首次提出了预测药物稳定性的多元线性模型。该模型指出,任何满足恒温降解动力学公式和Arrhenius公式的药物,都可在3维坐标系中以药物平面形式表示。以药物的浓度函数ln[f(c₀)-f(c)]和绝对温度的倒数1/T为变量,对时间的对数ln(t)进行多元线性回归,可以计算得到药物的活化能和室温贮存期。应用多元线性模型和经典恒温法对替诺昔康注射液(自制)、抗坏血酸注射液及盐酸丁卡因水溶液的室温贮存期预测的结果表明:两者无显著性差异,而本模型可大大减少实验次数,应用SAS软件使数据处理更简便。     

接受室溶液对离子导入影响的研究

目的：研究接受室溶液对盐酸丁卡因离子导入的影响。方法：测定不同接受室溶液及相同接受室溶液不同浓度的盐酸丁卡因离子导入增渗倍数。结果：盐酸丁卡因离子导入增渗倍数随着接受室阴离子（氯离子）（浓度的降低而增加,而与接受室溶液的离子强度和阳离子种类无关。结果：氯离子浓度影响盐酸丁卡因离子导入增渗倍数。     

Effects of glibenclamide and tetracaine on 86Rb+ fluxes in mouse pancreatic β-cells

Summary Potassium transport was measured in -cell-rich islets from ob/ob-mice using the K⁺-analogue ⁸⁶Rb⁺. Both tetracaine (0.1 mM) and glibenclamide (0.1 M) reduced the oubain-resistant ⁸⁶Rb⁺ influx but did not significantly affect the oubain-sensitive portion (Na⁺/K⁺ pump). Tetracaine (0.5–1 mM) or glibenclamide (0.2 mM) decreased the ⁸⁶Rb⁺ equilibrium content and glibenclamide (1 M) transiently reduced the ⁸⁶Rb⁺ efflux rate but 0.1 mM tetracaine had only a slight effect on this flux rate. The results suggest that a change in ouabain-resistant (passive) K⁺ fluxes, but not the Na⁺/K⁺ pump, is involved in stimulation of insulin secretion by glibenclamide and tetracaine. Both drugs may exert similar effects on the -cell plasma membrane.     

丁卡因和罗哌卡因对大鼠臂丛神经毒性的比较

目的 比较丁卡因和罗哌卡因对大鼠臂丛神经的毒性.方法 成年雄性SD大鼠48只,体重410～430 g,随机分为8组(n=6):NS组、D1-3组和R1-4组.各组大鼠随机选取一侧腋鞘,分别注射生理盐水1ml,0.25%、0.5%、1%丁卡因0.5 ml,0.25%、0.5%、1%罗哌卡因1 ml,2%罗哌卡因0.5 ml.以另一侧作为对照,注射后5 d时,测定臂丛神经动作电位的最大振幅及传导速度(NCV).结果 与对照侧比较,D2,3,组和R3,4组注射侧臂丛神经动作电位的最大振幅降低,NCV减慢(P<0.05);与NS组注射侧比较,D2,3组和R3,4组臂丛神经动作电位的最大振幅降低,NCV减慢(P<0.05);与D1组注射侧比较,D2,3组臂丛神经动作电位的最大振幅降低,NCV减慢(P<0.05);与D2组注射侧比较,D3组臂丛神经动作电位的最大振幅降低,NCV减慢,R2组臂丛神经动作电位的最大振幅升高,NCV加快(P<0<05);与D1组注射侧比较,R3组臂丛神经动作电位的最大振幅升高,NCV加快(P<0.05);与R1-3组注射侧比较,R4组臂丛神经动作电位的最大振幅降低,NCV减慢(P<0.05).结论 等效剂量丁卡因对臂丛神经的毒性较罗哌卡因大.     

Effect of reversible inactivation of reuniens nucleus on memory processing in passive avoidance task

The reuniens nucleus (RE) is the largest nucleus of the midline thalamic nuclei (MLN). RE has strongly connections with the amygdala and hippocampus, the structures that are involved in the learning and memory processes. In our previous report we have shown the role of RE in the spatial learning and memory using Morris water maze (MWM) task. Since RE is connected to multiple limbic structures, its involvement in the emotional learning and memory is a possibility. The present study was designed to elucidate the role of RE in acquisition, consolidation, and retrieval on the passive avoidance (PA) task which depends on a distributed network including the thalamus, amygdala, medial prefrontal cortex (mPFC) and hippocampus. For this purpose, rats were chronically implanted with a cannula aimed at the RE through which 0.5 μl tetracaine (2%) or saline were injected. Rats were trained in a PA task and their retention test was performed 24 h later. The injection of saline or tetracaine was applied 5 min before or 5, 90, and 360 min after the acquisition trial and 5 min before the retention tests. Our findings showed that inactivation of RE before training did not affect acquisition, but affected memory retention 24 h later in PA task. Moreover, inactivation of RE only 5 min after training impaired consolidation but not after 90 or 360 min. Also, inactivation of the RE, 5 min before the retrieval test impaired memory retrieval in PA task. In conclusion, it seems that RE is involved in memory processes in rats.