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Photochemical Degradation of Curcumin: a Mechanism for Aqueous Based Sensing of Fluoride

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Abstract

The present work describes the enhanced photochemical degradation of natural dye Curcumin in acetonitrile–water mixture in the presence of fluoride upon irradiation with light. The strong basicity of fluoride modifies the solvent environment around Curcumin molecule leading to alkaline mediated degradation of Curcumin which is further accelerated by irradiation with light. The photochemical degradation of Curcumin is studied using absorption and fluorescence spectroscopy and verified using infrared spectroscopy and fluorescence lifetime studies. The results of the work indicate that the method of Curcumin irradiation can be used as a sensing technique for fluoride detection in a wide range.

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Acknowledgements

The first author gratefully acknowledges Kerala State Council for Science, Technology & Environment (KSCSTE) for financial assistance in the form of a research fellowship. STIC India is also acknowledged for the FTIR analysis of the samples. The first author also thanks the discussions with Mr. Arindam Sarkar, Mr. Sony Udayan, Mr Mathew S and Ms. Alina C.

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Authors and Affiliations

  1. International School of Photonics, Cochin University of Science & Technology, Kochi, 682022, Kerala, India

    Roopa Venkataraj, C. P. Girijavallabhan, P. Radhakrishnan, V. P. N. Nampoori & M. Kailasnath

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  1. Roopa Venkataraj
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  2. C. P. Girijavallabhan
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  3. P. Radhakrishnan
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  4. V. P. N. Nampoori
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Correspondence to Roopa Venkataraj.

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Venkataraj, R., Girijavallabhan, C.P., Radhakrishnan, P. et al. Photochemical Degradation of Curcumin: a Mechanism for Aqueous Based Sensing of Fluoride. J Fluoresc 27, 2169–2176 (2017). https://doi.org/10.1007/s10895-017-2156-5

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  • DOI: https://doi.org/10.1007/s10895-017-2156-5

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