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The pH controlled fluorescence changes of a novel semiconducting polymer dots/pyrogallic acid system and a multifunctional sensing strategy for urea, urease and pesticides

Abstract

In this paper, a novel multifunctional semiconducting polymer dots (Pdots)/pyrogallic acid (PA) system was established successfully for the fluorescence sensing of urea, urease and pesticides. The Pdots/PA system was pH controllable. It emitted strong fluorescence at pH 6.0. However, in the alkaline environment, PA transformed to its quinone structure which was an efficient fluorescence quencher, and resulted in the fluorescence quenching of the Pdots/PA system. In addition, in the presence of urease, urea hydrolyzed and released hydroxyl groups which then caused the transformation of PA to its quinone structure and the fluorescence quenching of Pdots/PA system also took place. A sensitive detection method for urea and urease was thus developed. The limit of detection for urea and urease were 0.02 mM and 0.08 U/L, respectively. Pesticides such as dimethoate could inhibit the activity of urease, and resulted in the recovery of the fluorescence intensity of the Pdots/PA system. A fluorescence turn-on detection of pesticides could be also achieved. A satisfactory result was then obtained when detecting pesticides in the fruit and vegetable samples.

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Publication details

The article was received on 25 Sep 2017, accepted on 11 Nov 2017 and first published on 13 Nov 2017


Article type: Paper
DOI: 10.1039/C7AY02284K
Citation: Anal. Methods, 2017, Accepted Manuscript
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    The pH controlled fluorescence changes of a novel semiconducting polymer dots/pyrogallic acid system and a multifunctional sensing strategy for urea, urease and pesticides

    H. Huang, J. Li, M. Liu, Z. Wang, B. Wang, M. Li and Y. Li, Anal. Methods, 2017, Accepted Manuscript , DOI: 10.1039/C7AY02284K

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