Photoelectrochemical synthesis of DNA microarrays

Optical addressing of semiconductor electrodes represents a powerful technology that enables the independent and parallel control of a very large number of electrical phenomena at the solid-electrolyte interface. To date, it has been used in a wide range of applications including electrophoretic manipulation, biomolecule sensing, and stimulating networks of neurons. Here, we have adapted this approach for the parallel addressing of redox reactions, and report the construction of a DNA microarray synthesis platform based on semiconductor photoelectrochemistry (PEC). An amorphous silicon photoconductor is activated by an optical projection system to create virtual electrodes capable of electrochemically generating protons; these PEC-generated protons then cleave the acid-labile dimethoxytrityl protecting groups of DNA phosphoramidite synthesis reagents with the requisite spatial selectivity to generate DNA microarrays. Furthermore, a thin-film porous glass dramatically increases the amount of DNA synthesized per chip by over an order of magnitude versus uncoated glass. This platform demonstrates that PEC can be used toward combinatorial bio-polymer and small molecule synthesis.     

三苯甲基保护的巯烷臂寡核苷酸的合成及荧光标记

用三苯甲基巯基乙醇与氯化甲氧基吗啉亚磷酰胺连接得到一种亚磷酰胺试剂（Ⅲ）。用该试剂通过固相合成仪合成了5′末端巯烷基修饰的寡核苷酸,用Ag^ 脱去巯基的三苯甲基保护后与ω-碘已基修饰的荧光基因反应,得到相应的荧光标记寡核苷酸探针,设计的lmbH筛选探针与质粒DNA进行杂交,杂交结果验证了这种标记的实用性,灵敏度不达1pmol。     

制备磷酰胺RNA核糖核苷酸嘌呤的高区域保护

目的:制备磷酰胺RNA核糖核苷酸嘌呤的高区域保护。方法:用一氢磷酰盐的方法来保护RNA甲硅烷基化合成的反应。结果:以鸟苷为原料生成苯氧乙酰胺来保护羟基,合成RNA中间体,通过液相图谱的方法来检验合成的物质。结论:本实验方法是基于二位的羟基是高区域专一的硅烷化作用,为了更有效的使羟基硅烷化用磷酰胺的方法,我们以前是定量的使一氢磷酰脂分裂,没有甲硅烷基的转化,除此之外,相同的方法,高区域专业用阻止硅烷化和磷酰化的方法。