A "Signal On" Photoelectrochemical Aptasensor For Tetracycline Detection Based On Semiconductor Polymer Quantum Dots

A tetraphenylporphyrin (TPP) doped PFBT polymer quantum dots (TP-Pdots) were synthesized via the reprecipitation method for photoelectrochemical (PEC) aptasensor detection of tetracycline (TC). The TP-Pdots exhibit a superior cathode photocurrent signal. TP-Pdots increase the separation of photo-gen...

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Veröffentlicht in:Journal of the Electrochemical Society 2020-04, Vol.167 (6), p.67516, Article 067516
Hauptverfasser: Piaopiao, Chen, Yichen, Xing, Xiaoxiao, Chen, Shan, Zheng, Yang, Li, Chaobiao, Huang
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Sprache:eng
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Zusammenfassung:A tetraphenylporphyrin (TPP) doped PFBT polymer quantum dots (TP-Pdots) were synthesized via the reprecipitation method for photoelectrochemical (PEC) aptasensor detection of tetracycline (TC). The TP-Pdots exhibit a superior cathode photocurrent signal. TP-Pdots increase the separation of photo-generated charges, and improve photocurrent conversion efficiency, resulting in enhanced photocurrent response. The aptamer was used as a recognition element and TP-Pdots as a photoactive material to prepare a PEC aptasensor for sensitivity detection of TC. The PEC aptasensor was constructed by immobilizing TP-Pdots on ITO electrode and combining it with aptamer by EDC coupling. After the TC reacts specifically with the aptamer, causing the aptamer to fall off from the TP-Pdots /ITO electrodes surface and the photocurrent intensity restored. This PEC aptamer sensor possesses a wide linear range from 1.0 nmol.l−1 to 1.0 × 10 4 nmol.l−1 with the detection limit of 0.26 nmol.l−1. Meanwhile, the PEC aptasensor was successfully used for the detection of tetracycline in honey.
ISSN:0013-4651
1945-7111
1945-7111
DOI:10.1149/1945-7111/ab818a