JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2016, Vol. 59 ›› Issue (01): 80-86.doi: 10.3969/j.issn.1000-2006.2016.01.013

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A natural quercetin-based fluorescent sensor for sensitive and selective detection of acetate ions

XU Yuanyuan1,4, YANG Shilong1,2, JIANG Weina1,2, ZHAO Fengyi1,4, YIN Bin4, XU Li1,3,4*, GAO Buhong3, SUN Haijun3, DU Liting3, TANG Ying3,5, CAO   

  1. 1. Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University;
    2. College of Chemical Engineering, Nanjing Forestry University;
    3. Advanced Analysis and Testing Center, Nanjing Forestry University;
    4. College of Science, Nanjing Forestry University;
    5. College of Forestry, Nanjing Forestry University, Nanjing 210037, China
  • Online:2016-02-18 Published:2016-02-18

Abstract: A natural quercetin-based fluorescent sensor for sensitive and selective detection of acetate ions has been studied. Changes of fluorescence spectrum were studied before and after the addition of different anions in dimethyl sulfoxide(DMSO)solution of quercetin(Q), fluorescence emission intensity of Q increased obviously, acetate ions enhance fluorescence emission. And the fluorescence emission intensity had no change when adding other anions(Cl-,Br-,I-,ClO-4,H2PO-4). All suggested that the progress for detecting acetate ions will not be affected by other anions, and quercetin-based fluorescent sensor has good selectivity. The sensor Q can be applied to the quantification of acetate ions with a linear range of 1.0×10-6-8.0 × 10-6 mol/L and the detection limit of 1.0 × 10-7 mol/L. The stoichiometric ratio of Q and acetate ions was 3:2 obtained by Job's plot. The stability constant is 3.11×104. The 1H-NMR spectra of Q and Q-Ac- system showed a probable mechanism of quercetin recognition was that Ac- could destroy or weaken original hydrogen bonds, and promote charge transfer within quercetin molecule, which resulted in fluorescence intensity increasing. This method had been successfully applied in detecting acetate ions of samples in DMSO with good recovery(98.82%-100.96%)and repeatability.

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