Determination of nucleic acids using fluorescence probe sensitized by microemulsion

作者：Wei, Qin^*; Zhang, Hui; Du, Bin; Duan, Caihong

来源：Journal of AOAC International, 2006, 89(6): 1609-1616.

Because the fluorescence of azur A can be quenched by adding nucleic acid, a sensitive fluorometric method for determination of nucleic acids at nanogram levels was established. Using optimal conditions, the calibration curves were linear in the range of 0-6.0 mu g/mL for calf thymus deoxyribonucleic acid (ct DNA) and 0-7.0 mu g/mL for herring sperm DNA (hs DNA). The limits of determination were 3.5 and 3.8 ng/mL, respectively, which shows the high sensitivity of this method. Triton X-100 microemulsion was applied as a sensitive media to enhance the sensitivity. The binding mode concerning the interactions of azur A with nucleic acids was also studied and the association constant with different binding numbers was obtained. The method has been applied to the determination of nucleic acid in both synthetic and real samples, such as cauliflower and pork liver, with satisfactory results.

• 出版日期2006-12
• 单位暨南大学