谷胱甘肽过氧化物酶(GPx)激发的活性胶体催化剂是通过将催化活性硒(Se)部分整合到水微凝胶中而合成的。已成功合成了二硒化物交联剂(Se X-交联剂),并通过沉淀聚合将其与常规交联剂N,N'-亚甲基双(丙烯酰胺)(BIS)结合到微凝胶中。通过H 2 O 2氧化裂解微凝胶中的二硒键并转化为硒酸,同时保持完整的微凝胶微结构。通过这种方法,合成了具有可变量硒酸的催化活性微凝胶。值得注意的是,在丙烯醛向丙烯酸和丙烯酸甲酯的模型氧化反应中,微凝胶在低反应温度下显示出比分子Se催化剂更高的催化活性和选择性。
Dual-Responsive Polyphosphoester-Doxorubicin Prodrug Containing a Diselenide Bond: Synthesis, Characterization, and Drug Delivery
作者:Guoqing Ma、Jie Liu、Jinlin He、Mingzu Zhang、Peihong Ni
DOI:10.1021/acsbiomaterials.8b00429
日期:2018.7.9
The development of novel stimuli-responsive and biodegradable polyphosphoester-anticancer prodrugs is of importance in designing water-soluble prodrugs utilized in the field of drug delivery. In this study, the focus is on the synthesis of biocompatible and biodegradable diselenide-containing polyphosphoester [PEEP-b-PBYP-Se]2 using reduction-responsive di(1-hydroxylundecyl) diselenide as an initiator
新型刺激响应性和可生物降解的多磷酸酯-抗癌前药的开发对于设计在药物递送领域中使用的水溶性前药具有重要意义。在这项研究中,重点是使用具有还原反应性的二(1-羟基苯癸基)二硒化物作为引发剂,聚合2-(but-3),合成具有生物相容性和可生物降解性的二硒化物的聚磷酸酯[PEEP - b -PBYP-Se] 2。 -yn-1-yloxy)-2-oxo-1,3,2-dioxaphospholane(BYP)和2-ethoxy-2-oxo-1,3,2-dioxaphospholane(EOP)。之后,将含有叠氮基的阿霉素(DOX)衍生物连接到[PEEP- b -PBYP-Se] 2的侧链上通过Cu(I)催化的叠氮化物-炔烃环加成(CuAAC)“点击”反应产生pH /还原反应性聚合物前药,即[PEEP- b-(PBYP- hyd -DOX)-Se] 2。通过核磁共振波谱,紫外可见分光光度计,傅立叶变换红
The Se–Te bond was prepared by a metathesisreaction between diselenides and ditellurides, which could be manipulated with the presence or absence of visible light. Additionally, the apparent activation energy of the exchange process was measured to be only 28.01 kJ mol−1, explaining the high reactivity and sensitivity to light.
wavelengths, which would be useful in controllable dynamic chemistry, has rarely been studied. Taking advantage of the different bond energies of disulfide and diselenide bonds, we have developed a wavelength‐driven exchange reaction between disulfides and diselenides, which underwent metathesis under UV light to produce Se−S bonds. When irradiated with visible light, the Se−S bonds were reversed back to
A block copolymer with diselenide bonds in the polymer backbone was reported. This block copolymer was capable of forming micellar aggregates that were responsive to redox stimuli. Compared with other redox responsive aggregates, this type of diselenide-containing block copolymer aggregates Could be responsive to both oxidants and reductants even in a solution with a very low concentration under mild conditions.