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Resonance Rayleigh scattering spectra for studying the interaction of aminoglycoside antibiotics with pontamine sky blue and their analytical applications

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Abstract

In a weakly acid medium, some aminoglycoside antibiotics, such as kanamycin (KANA), gentamicin (GEN), tobramycin (TOB), and neomycin (NEO), or acid bisazo dye pontamine sky blue (PSB) can only produce very weak resonance Rayleigh scattering (RRS) signals. However, when the two agents react with each other to form the ion association complexes, the RRS intensity can be enhanced greatly and a new RRS spectrum and a significant enhancement of the RRS intensity in the wavelength range 350–600 nm can be observed. The maximum scattering peak is at 580 nm. There is a linear relationship between the RRS intensity and the antibiotic concentration in the range 0.01–6.0 μg mL−1 at 580 nm. This RRS method has therefore been developed for the determination of trace levels of aminoglycoside antibiotics. The detection limits (3σ) of the four antibiotics, whose order of sensitivity is KANA>NEO>TOB>GEN, are 5.8–6.9 ng mL−1. This method has a good selectivity and has been successfully applied to the quick determination of antibiotics not only for injections and ear drops, but clinic serum samples as well. In addition, quantum chemistry-based analysis of the reaction mechanism, the factors influencing the RRS spectra, and the reasons for the enhancement of RRS are discussed.

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Acknowledgements

This project is supported by the National Natural Science Foundation of China.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Southwest China Normal University, 400715, Chongqing, P.R. China

    Xiaoli L. Hu, Shaopu P. Liu & Nianbing Li

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  1. Xiaoli L. Hu
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  2. Shaopu P. Liu
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  3. Nianbing Li
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Correspondence to Shaopu P. Liu.

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Hu, X.L., Liu, S.P. & Li, N. Resonance Rayleigh scattering spectra for studying the interaction of aminoglycoside antibiotics with pontamine sky blue and their analytical applications. Anal Bioanal Chem 376, 42–48 (2003). https://doi.org/10.1007/s00216-003-1878-1

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  • DOI: https://doi.org/10.1007/s00216-003-1878-1

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