Acta Chimica Sinica ›› 2008, Vol. 66 ›› Issue (19): 2131-2137.

Original Articles

### 利福霉素类抗生素-Cu(II)-核酸体系的RRS光谱研究

1. (a西南大学化学化工学院 重庆 400715)
(b长江师范学院化学系 重庆 408003)

• 投稿日期:2008-02-24 修回日期:2008-05-04 发布日期:2008-10-14
• 通讯作者: 刘绍璞

### Resonance Rayleigh Scattering Spectra of Rifamycins Antibiotics-Cu(II)-Nnucleic Acid System

YANG, Ji-Dong a,b CAO, Tuan-Wu b LIU, Shao-Pu *,a

1. (a College of Chemistry and Chemical Engineering, Southwest China University, Chongqing 400715)
(b Department of Chemistry, Yangtze Normal College, Chongqing 408003)
• Received:2008-02-24 Revised:2008-05-04 Published:2008-10-14
• Contact: LIU, Shao-Pu

In the pH 1.9～2.1 Britton-Robinson (B-R) buffer solution, rifamycin drugs such as Rifamycin SV (RFSV), Rifapentine (RFPT) and Rifampicin (RFP) could react with ct-DNA. These rifamycin drugs themselves had slight resonance Rayleigh scattering (RRS) spectral peaks and analogical spectral characteristics with RRS peaks at around 290 and 370 nm; meanwhile, ctDNA had a faint peak at 310 nm. The RRS intensity was enhanced obviously after the drugs and DNA reacting with each other, which indicated the formation of new products for the maximum peak appeared at around 375 nm with slight red shift. Then the Cu(II) ion was added into the system to form a ternary system, and the RRS intensity was enhanced significantly, when the enhanced spectral value was directly proportional to the concentration of the DNA. Thus a highly sensitive method could be obtained for determining DNA and the detection limit of the experiment reached 9.7 ng/mL for the RFSV system. In this work, the optimum reaction conditions and influencing factors were investigated and a new method for the determination of DNA has been developed by the RRS spectral technology.