Combined with an effective copper-catalyzed triazole-forming reaction, a series of novel camptothecin derivatives were synthesized. Incorporating oligo（ethylene glycol） chains into the derivatives enhanced their wat...Combined with an effective copper-catalyzed triazole-forming reaction, a series of novel camptothecin derivatives were synthesized. Incorporating oligo（ethylene glycol） chains into the derivatives enhanced their water-solubility when compared to the parent compound （up to 55-fold）.展开更多
In this study the spectroscopic characteristics of a water-soluble derivative of hypocrellin A (HA), 14-dehydroxy-15-deacetyl-hypocrellin A-13-sulfonate(13-SO3Na-DDHA),and its one- and two-electron reduction products ...In this study the spectroscopic characteristics of a water-soluble derivative of hypocrellin A (HA), 14-dehydroxy-15-deacetyl-hypocrellin A-13-sulfonate(13-SO3Na-DDHA),and its one- and two-electron reduction products have been investigated. From the changes in absorbance with pH it was observed that the two phenolic hydroxy groups at C-3 and C-10 positions of 13-SO3Na-DDHA or HA dissociated stepwise with increase of pH values. The pKa values for 13-SO3Na-DDHA and HA were determined using an effective method established in this study. Attempts were also made to use absorption and ESR spectroscopies to study the photoreduction of 13-SO3Na-DDHA. It was found that 13-SO3Na-DDHA was directly reduced to its two-electron reduction product in buffered aqueous solution (pH 7. 7). However, in DMF-buffer (1 :1/ v : v,pH 7. 7), it proceeded with one-electron reduction to generate its semiquinone radical anions. The semiquinone radical anions decayed according to second-order kinetics. indicating that the termination went through protonation and disproportionation of the radical anions. Despite of four pheholic hydroxy groups in the molecule of the two-electron reduction product only two hydroxy groups seem to dissociate with increase of pH. This reflects that strong intramolecular hydrogen bonds are probably formed in the mono- and dian-ionic forms of the two-electron reduction product.展开更多
目的:比较莫司类药物洗脱支架(LES)与紫杉醇洗脱支架(PES)在冠状动脉小血管病变患者中的疗效。方法:通过PubMed、Web of Science、ClinicalTrials、中国生物医学文献数据库、中国知网、万方数据和维普数据库对与本次研究主题相关的文献...目的:比较莫司类药物洗脱支架(LES)与紫杉醇洗脱支架(PES)在冠状动脉小血管病变患者中的疗效。方法:通过PubMed、Web of Science、ClinicalTrials、中国生物医学文献数据库、中国知网、万方数据和维普数据库对与本次研究主题相关的文献进行检索,对纳入的文献进行方法学质量评价。采用RevMan 5.2及Stata 14.0软件进行相关的统计学分析。结果:八项研究共4738例患者纳入此研究。与PES比较,植入LES能减少主要心血管不良事件(RR=0.64,95%CI:0.53~0.77,Z=4.59,P<0.01)、心肌梗死(RR=0.61,95%CI:0.45~0.82,Z=3.24,P<0.01)、支架内血栓(RR=0.22,95%CI:0.13~0.37,Z=5.71,P<0.01)以及靶病变血运重建(RR=0.56,95%CI:0.44~0.71,Z=4.72,P<0.01)的发生率。与PES比较,LES不能减少心因性死亡(RR=1.08,95%CI:0.62~1.88,Z=0.26,P>0.05)和靶血管血运重建事件的发生率(RR=0.80,95%CI:0.45~1.44,Z=0.74,P>0.05)。结论:对于冠状动脉小血管病变行经皮冠脉介入支架植入术的患者,LES较PES有更好的长期疗效,可作为该类患者的首选支架。展开更多
文摘Combined with an effective copper-catalyzed triazole-forming reaction, a series of novel camptothecin derivatives were synthesized. Incorporating oligo（ethylene glycol） chains into the derivatives enhanced their water-solubility when compared to the parent compound （up to 55-fold）.
基金Project supported by the National Natural Science Foundation of China.
文摘In this study the spectroscopic characteristics of a water-soluble derivative of hypocrellin A (HA), 14-dehydroxy-15-deacetyl-hypocrellin A-13-sulfonate(13-SO3Na-DDHA),and its one- and two-electron reduction products have been investigated. From the changes in absorbance with pH it was observed that the two phenolic hydroxy groups at C-3 and C-10 positions of 13-SO3Na-DDHA or HA dissociated stepwise with increase of pH values. The pKa values for 13-SO3Na-DDHA and HA were determined using an effective method established in this study. Attempts were also made to use absorption and ESR spectroscopies to study the photoreduction of 13-SO3Na-DDHA. It was found that 13-SO3Na-DDHA was directly reduced to its two-electron reduction product in buffered aqueous solution (pH 7. 7). However, in DMF-buffer (1 :1/ v : v,pH 7. 7), it proceeded with one-electron reduction to generate its semiquinone radical anions. The semiquinone radical anions decayed according to second-order kinetics. indicating that the termination went through protonation and disproportionation of the radical anions. Despite of four pheholic hydroxy groups in the molecule of the two-electron reduction product only two hydroxy groups seem to dissociate with increase of pH. This reflects that strong intramolecular hydrogen bonds are probably formed in the mono- and dian-ionic forms of the two-electron reduction product.
文摘目的:比较莫司类药物洗脱支架(LES)与紫杉醇洗脱支架(PES)在冠状动脉小血管病变患者中的疗效。方法:通过PubMed、Web of Science、ClinicalTrials、中国生物医学文献数据库、中国知网、万方数据和维普数据库对与本次研究主题相关的文献进行检索,对纳入的文献进行方法学质量评价。采用RevMan 5.2及Stata 14.0软件进行相关的统计学分析。结果:八项研究共4738例患者纳入此研究。与PES比较,植入LES能减少主要心血管不良事件(RR=0.64,95%CI:0.53~0.77,Z=4.59,P<0.01)、心肌梗死(RR=0.61,95%CI:0.45~0.82,Z=3.24,P<0.01)、支架内血栓(RR=0.22,95%CI:0.13~0.37,Z=5.71,P<0.01)以及靶病变血运重建(RR=0.56,95%CI:0.44~0.71,Z=4.72,P<0.01)的发生率。与PES比较,LES不能减少心因性死亡(RR=1.08,95%CI:0.62~1.88,Z=0.26,P>0.05)和靶血管血运重建事件的发生率(RR=0.80,95%CI:0.45~1.44,Z=0.74,P>0.05)。结论:对于冠状动脉小血管病变行经皮冠脉介入支架植入术的患者,LES较PES有更好的长期疗效,可作为该类患者的首选支架。
