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Application of L-Cys-Capped CdS Nanoparticles in Determination of Nucleic Acid by Resonance Light-Scattering Technique

DAI Mei-ling, YAN Zheng-yu*, QU Ping, SHAO Xiu-fen   

  1. Department of Analytical Chemistry, China Pharmaceutical University, Nanjing 210038, China

  • Received:2005-10-25 Revised:2006-05-10 Online:2006-06-15 Published:2006-06-15
  • Contact: YAN Zheng-yu*

Abstract: Aim To determine nucleic acid (DNA) using Nanometer-sized L-cysteine-capped CdS particles by resonance light scattering (RLS) method. Methods The nano-particles synthesized by a colloidal aqueous method were water-soluble, stable, and highly luminescent. The RLS of L-Cys-CdS particles were greatly quenched by DNA in Tris-HCl solutions. The intensity of RLS at 344 nm was proportional to the concentration of DNA. Results The linearity range of the calibration curve was 0.01-1.0 μg·mL-1 for calf thymus DNA and 0.04-1.5 μg·mL-1 for salmon sperm DNA. The detection limits (3 δ) were 8 ng·mL-1 for calf thymus DNA and 10 ng·mL-1 for salmon sperm DNA. Conclusion This method is simple, sensitive, and capable of avoiding the use of toxic dyes.

Key words: CdS, CdS, resonance light scattering, resonance light scattering, cysteine, cysteine, DNA, DNA

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