کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
179388 | 459347 | 2013 | 4 صفحه PDF | دانلود رایگان |
• Photoelectrochemical (PEC) Pb2 + sensing was achieved firstly.
• G-quadruplex-based DNAzyme and biocatalytic precipitation were coupled.
• Amplified ultrasensitive PEC detection of Pb2 + was realized.
• It opened a different horizon for PEC ions sensing.
A sensitive photoelectrochemical (PEC) approach for Pb2 + sensing was achieved firstly with the coupling of G-quadruplex-based DNAzyme and biocatalytic precipitation (BCP) on a CdS quantum dots electrode. Pb2 + can induce the conformational change of K+-stabilized G-quadruplex-based DNAzyme, leading to the decrease of the catalytic activity to H2O2-mediated 4-chloro-1-naphthol oxidation (BCP reaction). From the respective BCP reaction that monitors the event of DNAzyme deactivation, a novel PEC Pb2 + sensor could be realized with a detection limit of 1.0 × 10− 8 M.
Journal: Electrochemistry Communications - Volume 35, October 2013, Pages 38–41