Novel Pb2+ supersensitive detecting method based on photoelectrochemical sensing

A photoelectrochemical, ultra-sensitive technology, applied in the field of photoelectrochemical sensing of analytical chemistry, to achieve good selectivity, high sensitivity, and easy operation
CN103399062AInactive Publication Date: 2013-11-20TAIZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TAIZHOU UNIV
Publication Date
2013-11-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to construction of a photoelectrochemical sensor which is based on conformation transition of G-quadruplex DNAzyme, and belongs to the field of photoelectrochemical sensor technology of analytical chemistry, wherein the conformation transition is induced by Pb2+, and the photoelectrochemical sensor is capable of realizing supersensitive sensing of Pb2+ effectively. K+ is replace by Pb2+ to induce the conformation transition of G-quadruplex DNAzyme so as to decrease enzymatic activity, so that enzyme biological catalytic precipitation reaction on an ITO electrode which is modified by CdS quantum dots is influenced, and photoelectrochemical sensing detection of Pb2+ is realized. G-quadruplex DNAzyme is applied in a photoelectrochemical sensing system for detection of Pb2+ for the first time; the photoelectrochemical sensor possesses advantages of high selectivity and high ensitivity; and detection limit of Pb2+ reaches to 1.0*10<-8>M.
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Description

technical field

[0001] The invention belongs to the technical field of photoelectrochemical sensing of analytical chemistry, and relates to a Pb-based 2+ The induced conformational transition of G-quadruplex DNA enzyme leads to the decrease of enzyme activity and the construction of photoelectrochemical sensor based on the change of photocurrent in the system, which can effectively realize the Pb 2+ Ultra sensitive detection. Background technique

[0002] The photoelectrochemical process refers to the photoelectric conversion process of photosensitive materials through electronic excitation and charge transfer under the action of light. As an independent integrated detection device, electrochemical biosensors have had an increasingly important impact on the biochemical and medical fields. With the rapid development of nanotechnology and material chemistry, a new generation of photoelectrochemical biosensors has been developed based on the combination of photoelectrochemica...

Claims

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