Evaluation of Multivalent Dendrimers Based on Melamine: Kinetics of Thiol−Disulfide Exchange Depends on the Structure of the Dendrimer
作者:Wen Zhang、Shane E. Tichy、Lisa M. Pérez、Gheorghe C. Maria、Paul A. Lindahl、Eric E. Simanek
DOI:10.1021/ja0210906
日期:2003.4.1
The rate of thiol-disulfide exchange of dansyl groups mediated by dithiothreitol depends on the structure of the dendrimer. In general, the rate of exchange decreases as the size of the dendrimer increases. Dendrimers with disulfides attached near the core undergo exchange more slowly than dendrimers with disulfides near the periphery. Exchange is a bimolecular (noncooperative) process between dansyl-linked
由二硫苏糖醇介导的丹磺酰基的硫醇-二硫化物交换速率取决于树枝状聚合物的结构。一般而言,交换率随着树枝状聚合物尺寸的增加而降低。在核心附近连接有二硫化物的树枝状大分子比在外围附近有二硫化物的树枝状大分子进行交换更慢。交换是丹酰连接的二硫化物和二硫苏糖醇之间的双分子(非合作)过程。没有观察到分子内大环化(合作)交换的证据。质谱法用于跟踪两个树枝状聚合物的交换,提供有关此过程的定性和定量信息。数学模型表明,树枝状聚合物的所有二硫化物的交换速率相似,但随着交换反应的进行而增加。