采用生物转化的方法对齐墩果烷型五环三萜刺囊酸(echinocystic acid,EA)进行结构修饰,从而探究其抗HCV进入活性的构效关系.实验中,选了总状共头霉Syncephalastrumracemosum AS 3.264对EA进行结构修饰.分离得到了4个有立体、区域选择的E...
详细信息
采用生物转化的方法对齐墩果烷型五环三萜刺囊酸(echinocystic acid,EA)进行结构修饰,从而探究其抗HCV进入活性的构效关系.实验中,选了总状共头霉Syncephalastrumracemosum AS 3.264对EA进行结构修饰.分离得到了4个有立体、区域选择的EA的修饰产物,反应类型包括羟基化、脱氢、内酯化以及糖基化.对转化产物进行抗HCV活性测试,提示针对EA的C-28位的修饰或许有助于提高其抗HCV进入的活性,同时能减小五环三萜的溶血毒性.
5-Iodouracil derivatives have interesting biological activities and can serve as important substrates for the metal-catalyzed cross-coupling reactions to introduce alkyl, alkenyl, and alkynyl groups to the C-5 positio...
详细信息
5-Iodouracil derivatives have interesting biological activities and can serve as important substrates for the metal-catalyzed cross-coupling reactions to introduce alkyl, alkenyl, and alkynyl groups to the C-5 position of uracil derivatives. In order to find a good method to iodinate directly the C-5 of uracil derivatives, we investigated three methods, which included iodine/lead (IV) dioxide, iodine/ammonium hexanitratocerate (CAN) and iodine chloride, and examined their reactivity to different types of uracil and thiouracil derivatives.
Safflower is a popular Chinese medicinal plant and Safflower injection is extensively used for the clinical treatment of cerebrovascular and cardiovascular diseases. In this study, HPLC-DAD-ESI-MSn was utilized to stu...
详细信息
Safflower is a popular Chinese medicinal plant and Safflower injection is extensively used for the clinical treatment of cerebrovascular and cardiovascular diseases. In this study, HPLC-DAD-ESI-MSn was utilized to study the stability and degradation of the two major but chemically unstable bioactive compounds hydroxysaffior yellow A and anhydrosaffior yellow B, in Safflower injection. The impact of light irradiation, temperature, and pH on the stability of these two compounds were studied. The results showed that hydroxysafflor yellow A and anhydrosafflor yellow B could degrade at high temperature (〉60 ℃) or extreme pHs (pH ≤ 3.0 or 〉7.0), but not under light irradiation. The common degradation product was p-coumaric acid. Chemical structures of the other degradation products were characterized by LC-MS. Hypothetical degradation pathways were proposed. In addition, ADP-induced platelet aggregation tests showed that the degradation of anhydrosaffior yellow B could reduce the anticoagulation activities of Safflower injection. Our results suggest that temperature and pH are critically important for the preparation and storage of Safflower injection.
Population pharmacokinetic meta-analysis method was used in order to obtain the pharmacokinetic characteristics of risperidone and its active metabolite. Eighteen studies were selected from published papers from 1995 ...
详细信息
Population pharmacokinetic meta-analysis method was used in order to obtain the pharmacokinetic characteristics of risperidone and its active metabolite. Eighteen studies were selected from published papers from 1995 to 2011. A model consisted of two compartments for parent drug and one compartment for its active metabolite combined with a flexible absorption process was developed based on the meta-dataset. The population-predicted apparent clearance for risperidone and 9-hydroxyrisperidone, the active metabolite was 7.66 L/h and 7.38 L/h, and the apparent volume of distribution in the central compartment was 70.6 L and 117 L, respectively. The final model was evaluated by visual predictive check(VPC) based on 1000 times model simulation. This model was adequately used to predict clinical therapeutic drug monitoring(TDM) data from 42 Chinese inpatients. Bias(mean prediction errors, MPE) and precision(root mean squared prediction errors, RMSE) were calculated to statistically analysis the population prediction error. It was demonstrated that the model developed from the meta-dataset was reliable and can be used to facilitate the individualized treatment for a target population.
暂无评论