中文摘要：

在水溶液中，带正电荷的Ru（phen）2dppx^2＋在阴离子表面活性剂十二烷基苯磺酸钠（SDBS）的表面聚集后，产生很强的共振瑞利散射。由于Ru（phen）2dppx^2＋与DNA之间有较大的结合常数（KB≥10^6L·mol^-1），DNA的加入会使体系中“光开关”与SDBS分离，散射光强度大大降低，且体系散射光的降低程度与DNA的浓度呈线性关系。据此建立了DNA的定量测定新方法。

英文摘要：

In aqueous solution, positive charged Ru（phen）2dppx^2＋ could assemble on the surface of negative charged SDBS （Sodium dodecylbenzene sulfonate） resulting in strong resonance rayleigh scattering. Because of high affinity between Ru（phen）2dppx^2＋ and DNA （KB≥10^6L·mol^-1 ）, Ru（phen）2dppx^2＋ will separate with SDBS in the presance of DNA and resulting great scattering light reduce. The decrease of resonance rayleigh scattering light is linear to the concentration of DNA. So a novel method is proposed for the determination of DNA.