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Fluorescent Carbon Dot as Nanosensor for Sensitive and Selective Detection of Cefixime Based on Inner Filter Effect

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Abstract

Here a simple and sensitive fluorescent assay for detecting Cefixime based on inner filter effect (IFE) has been proven, which is conceptually different from the previously reported CEF fluorescent assays. In this sensing platform, fluorescent carbon dots (CDs) were prepared by one-pot synthesis and was directly used as fluorophore in IFE. The method is based on the complexation reaction between cefixime and palladium ion in the presence of acidic buffer solution (pH 4). The Pd(II)-CEFcomplex was capable of functioning as a powerful absorber in IFE to influence the excitation of fluorophore (CDs). Production Pd(II)-CEFcomplex induced the absorption band transition from 310 to 400 nm, which resulted in the complementary overlap with the excitation spectra of CDs. Due to the competitive absorption, the excitation of CDs was significantly weakened, resulting in the quenching of CDs. The present IFE-based sensing strategy showed a good linear relationship from 0.2 × 10−6 M to 8 × 10−6 M (R2 = 0.987) and provided an exciting detection limit of 0.5 × 10−7 (3δ/slope). The proposed method has been successfully applied for the determination of cefixime in raw milk and human urine samples.

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Abbreviations

CDs :

Carbon quantum dots

PL :

Photoluminescence

CEF :

Cefixime

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Authors and Affiliations

  1. Department of Analytical Chemistry, Faculty of Chemistry, Urmia University, Urmia, Iran

    Farhad Akhgari, Naser Samadi & Khalil Farhadi

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  1. Farhad Akhgari
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  2. Naser Samadi
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  3. Khalil Farhadi
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Correspondence to Naser Samadi.

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Akhgari, F., Samadi, N. & Farhadi, K. Fluorescent Carbon Dot as Nanosensor for Sensitive and Selective Detection of Cefixime Based on Inner Filter Effect. J Fluoresc 27, 921–927 (2017). https://doi.org/10.1007/s10895-017-2027-0

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  • DOI: https://doi.org/10.1007/s10895-017-2027-0

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