HPLC法测定野菊花中蒙花苷的含量

建立了HPLC法测定野菊花中蒙花苷含量的方法.采用AICHROM C18(250mm×4.6mm,5μg)色谱柱,以甲醇-0.8%磷酸(9:7)为流动相,流速为1.2ml·min-1,检测波长为326nm.蒙花苷在0.043～2.16μg的范围内具有良好的线性关系,相关系数为0.9999,平均回收率为98.9%(RSD为1.8%).本方法操作简便,灵敏度高,结果准确可靠.     

灵敏专属的HPLC法测定比格犬中非索非那定的浓度

目的建立简便的测定血浆中非索非那定血药浓度的高效液相色谱法.方法流动相为乙腈∶0.02磷酸缓冲液(35∶65,V∶V),流速为1.0 mL·min-1.柱温40 ± 1 ℃,检测波长210 nm.结果标准曲线的线性范围在10～1000 ng·mL-1,r = 0.999 4.最低检测限为3 ng·mL-1.高(800 ng·mL-1)、中(400 ng·mL-1)、低(10 ng·mL-1) 浓度提取回收率分别为85.2%±4.2%, 88.0%±3.9%和89.7%±3.5%;日间和日内RSD分别低于6.1%和4.2%.结论所建立的方法灵敏、快速、重现性好、选择性强.     

2000年～2003年广东省抗震颤麻痹药物应用分析

目的:了解广东省抗震颤麻痹药物应用情况.方法:对4年中消耗的抗震颤麻痹药物用药金额、用药频度及日均费用等的变化进行统计、分析.结果与结论:2000年～2003年抗震颤麻痹药中购药金额最大的为左旋多巴/苄丝肼;用药频度最高的为苯海索.     

张士卿教授治疗小儿病毒性心肌炎后遗症经验

张士卿教授以瓜蒌薤白半夏汤为主方治疗小儿病毒性心肌炎后遗症,在治疗时尤其重视活血药的加入,并随症灵活加减,疗效显著.     

天然抗氧化剂对抗PC12细胞氧化损伤的实验研究

目的:研究五味子乙素(SchB)对H2O2诱导的PC12细胞氧化损伤的保护作用及作用机制。方法:SchB与PC12细胞预培养24h后,加入H2O2处理,在倒置显微镜下观察细胞的形态改变,采用MTT法测定细胞生存率,采用单细胞凝胶电泳法测定DNA单链损伤,采用荧光法测定细胞内的谷胱甘肽(GSH)含量。结果:H2O2处理后细胞生存率明显降低,细胞内DNA单链损伤明显升高,而GSH含量明显降低。经SchB预培养的细胞生存率明显升高,细胞内DNA单链损伤明显减轻,GSH含量明显升高,其作用呈剂量依赖关系。结论:SchB对PC12细胞有明显的保护作用,其作用机制可能与提高GSH抗氧化系统的能力有关。     

氯诺昔康联合吗啡于妇科手术后镇痛的临床研究

目的:评价非甾体类抗炎药氯诺昔康联合吗啡用于妇科腹部手术后患者自控镇痛(PCA)的效应及安全性.方法:60例妇科开腹手术后疼痛患者随机分为H组和M组,接受PCA治疗.H组为使用氯诺昔康联合吗啡,M组使用吗啡.结果:氯诺昔康联合吗啡组与吗啡组术后VAS评分及镇静并无明显差异性.氯诺昔康联合吗啡组的胃肠道不良反应发生率低于吗啡组.结论:氯诺昔康联合吗啡用于妇科腹部手术后PCA效应于吗啡接近,可引起轻度胃肠道症状.     

不同免疫分析仪在环孢素A血药浓度监测中的差异

目的:考察不同分析方法对环孢素A(CsA)血药浓度监测中的影响.方法:71例肝肾移植术后CsA样品分别用AxSYM和TDx测定.结果:TDx监测结果大于AxSYM监测结果.结论:AxSYM和TDx在环孢素A血药浓度监测中存在差异.     

盐酸头孢吡肟的合成

以7-ACA为起始原料,经六甲基二硅胺烷保护羧基和氨基、三甲基碘硅烷进行取代后与N-甲基吡咯烷反应以及脱保护制得(6R,7R)-7-氨基-3-[(1-甲基-1-吡咯烷)甲基]头孢-3-烯-4-羧酸盐酸盐,再以丙酮为溶剂与苯并噻唑硫醇活性酯(MAEM)缩合制得盐酸头孢吡肟,总收率59.4%.     

反相高效液相色谱法测定熊胆丸中龙胆苦苷的含量

目的建立熊胆丸中龙胆苦苷的反相高效液相色谱法.方法采用Polarls C18柱,流动相为甲醇-水(25∶75);检测波长为270 nm.结果龙胆苦苷的进样量在0.184～0.920 μg范围内与其峰面积有良好的线性关系(r＝0.9994),平均加样回收率为97.72%,RSD为0.88%.结论该方法简便易行、准确可靠,可用于熊胆丸的质量控制.     

Sexual behavior and sex-associated environmental cues activate the mesolimbic system in male rats.

The mesolimbic system plays an important role in the regulation of both pathological behaviors such as drug addiction and normal motivated behaviors such as sexual behavior. The present study investigated the mechanism by which this system is endogenously activated during sexual behavior. Specifically, the effects of sexual experience and sex-related environmental cues on the activation of several components of the mesolimbic system were studied. The mesolimbic system consists of a dopaminergic projection from the ventral tegmental area (VTA) to the nucleus accumbens (NAc). Previous studies suggest that these neurons are under tonic inhibition by local GABA interneurons, which are in turn modulated by mu opioid receptor (MOR) ligands. To test the hypothesis that opioids are acting in the VTA during sexual behavior, visualization of MOR internalization in VTA was used as a marker for ligand-induced activation of the receptor. Significant increases in MOR internalization were observed following copulation or exposure to sex-related environmental cues. The next goal was to determine if sexual behavior activates dopamine neurons in the VTA, using tyrosine hydroxylase as a marker for dopaminergic neurons and Fos-immunoreactivity as a marker for neuronal activation. Significant increases in the percentage of activated dopaminergic neurons were observed following copulation or exposure to sex-related environmental cues. In addition, mating and sex-related cues activated a large population of nondopaminergic neurons in VTA as well as neurons in both the NAc Core and Shell. Taken together, our results provide functional neuroanatomical evidence that the mesolimbic system is activated by both sexual behavior and exposure to sex-related environmental cues.