Exonuclease III-assisted positive feedback signal amplification strategy for ultrasensitive electrochemical detection of nucleic acids

2020 ◽  
Vol 304 ◽  
pp. 127410 ◽  
Author(s):  
Kai Wen ◽  
Xingdong Yang ◽  
Cuiling Zhang ◽  
Huiying Wei ◽  
Guizheng Zou ◽  
...  
Keyword(s):  
Nucleic Acids ◽  
Electrochemical Detection ◽  
Positive Feedback ◽  
Signal Amplification ◽  
Feedback Signal ◽  
Exonuclease Iii ◽  
Amplification Strategy

Highly sensitive detection of nucleic acids using a cascade amplification strategy based on exonuclease III-assisted target recycling and conjugated polyelectrolytes

The Analyst ◽  
2018 ◽  
Vol 143 (18) ◽  
pp. 4267-4272 ◽  
Author(s):  
Biqing Bao ◽  
Yanrui Pan ◽  
Bingbing Gu ◽  
Jia Chen ◽  
Yu Xu ◽  
...  
Keyword(s):  
Nucleic Acids ◽  
Signal Amplification ◽  
Conjugated Polyelectrolytes ◽  
Exonuclease Iii ◽  
Target Recycling ◽  
Highly Sensitive ◽  
Exo Iii ◽  
Highly Sensitive Detection ◽  
Amplification Strategy ◽  
Cascade Amplification

A ratiometric and cascade amplification strategy that combines the signal amplification and effecitive FRET property of CPEs with the Exo III-assisted target recycling method has been developed for DNA detection.

scholarly journals Turn-On Fluorescence Aptasensor on Magnetic Nanobeads for Aflatoxin M1 Detection Based on an Exonuclease III-Assisted Signal Amplification Strategy

Nanomaterials ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 104
Author(s):  
Fuyuan Zhang ◽  
Linyang Liu ◽  
Shengnan Ni ◽  
Jiankang Deng ◽  
Guo-Jun Liu ◽  
...  
Keyword(s):  
Signal Amplification ◽  
Aflatoxin M1 ◽  
Exonuclease Iii ◽  
Sensor Performance ◽  
Milk Samples ◽  
Increased Sensitivity ◽  
Exo Iii ◽  
Amplification Strategy ◽  
Optimized Conditions ◽  
Magnetic Nanobeads

In order to satisfy the need for sensitive detection of Aflatoxin M1 (AFM1), we constructed a simple and signal-on fluorescence aptasensor based on an autocatalytic Exonuclease III (Exo III)-assisted signal amplification strategy. In this sensor, the DNA hybridization on magnetic nanobeads could be triggered by the target AFM1, resulting in the release of a single-stranded DNA to induce an Exo III-assisted signal amplification, in which numerous G-quadruplex structures would be produced and then associated with the fluorescent dye to generate significantly amplified fluorescence signals resulting in the increased sensitivity. Under the optimized conditions, this aptasensor was able to detect AFM1 with a practical detection limit of 9.73 ng kg−1 in milk samples. Furthermore, the prepared sensor was successfully used for detection of AFM1 in the commercially available milk samples with the recovery percentages ranging from 80.13% to 108.67%. Also, the sensor performance was evaluated by the commercial immunoassay kit with satisfactory results.

Exonuclease III-assisted signal amplification strategy for sensitive fluorescence detection of polynucleotide kinase based on poly(thymine)-templated copper nanoparticles

The Analyst ◽  
2019 ◽  
Vol 144 (22) ◽  
pp. 6689-6697 ◽  
Author(s):  
Han Zhao ◽  
Ying Yan ◽  
Mingjian Chen ◽  
Tingting Hu ◽  
Kefeng Wu ◽  
...  
Keyword(s):  
Fluorescence Detection ◽  
Copper Nanoparticles ◽  
Signal Amplification ◽  
Exonuclease Iii ◽  
Fluorescent Method ◽  
Polynucleotide Kinase ◽  
Amplification Strategy

A facile fluorescent method has been developed for polynucleotide kinase detection based on copper nanoparticles and exonuclease III-assisted signal amplification.

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