Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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CdTe Quantum Dots as Fluorescent Probes for Josamycin Determination

  • Peng, Jinyun (Department of Chemistry and Biological Science, Guangxi Normal University of Nationalities) ;
  • Nong, Keliang (Department of Chemistry and Biological Science, Guangxi Normal University of Nationalities) ;
  • Mu, Guangshan (Department of Chemistry and Biological Science, Guangxi Normal University of Nationalities) ;
  • Huang, Fengying (Department of Chemistry and Biological Science, Guangxi Normal University of Nationalities)
  • Received : 2011.03.29
  • Accepted : 2011.07.04
  • Published : 2011.08.20
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Abstract

A new method for the determination of josamycin has been developed based on quenching of the fluorescence of 3-mercaptopropionic acid-capped CdTe quantum dots (MPA-CdTe QDs) by josamycin in ethanol. Reaction time, interfering substances on the fluorescence quenching, and mechanism of the interaction of CdTe QDs with josamycin were investigated. Under optimum conditions, the relative fluorescence intensity was linearly proportional to the concentration of josamycin between 12.0 and 120.0 ${\mu}g\;mL^{-1}$ with a correlation coefficient of 0.9956 and a detection limit of 2.5 ${\mu}g\;mL^{-1}$. The proposed method was successfully applied to commercial tablets, and the results were satisfactory, i.e. consistent with those of high-performance liquid chromatography (HPLC).

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