Electrostatic assembly of gold nanoparticles on black phosphorus nanosheets for electrochemical aptasensing of patulin

Microchimica Acta - Tập 186 - Trang 1-8 - 2019
Jinqiong Xu1, Xiujuan Qiao1, Yuan Wang2, Qinglin Sheng2,3, Tianli Yue2, Jianbin Zheng1, Ming Zhou4
1College of Chemistry & Materials Science/Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education/Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry, Northwest University, Xi’an, China
2College of Food Science and Engineering, Northwest University, Xi’an, China
3State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing, China
4Key Laboratory of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, and National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun, People’s Republic of China

Tóm tắt

An aptamer based impedimetric assay for the mycotoxin patulin (PAT) is described. A glassy carbon electrode (GCE) was modified with black phosphorus nanosheets (BP NSs) and modified with PAT aptamer by electrostatic attraction. Detection is based on the variations of electron transfer resistance at the modified electrode surface. This assay can detect PAT over a linear range that extends from 1.0 nM to 1.0 μM with a 0.3 nM detection limit. To improve the performance of the sensor, the BP NS-GCE was further modified with gold nanoparticles and then with thiolated PAT aptamer. This modified electrode, operated at an applied potential of 0.18 V (vs. Ag/AgCl), has a wider linear range (0.1 nM to 10.0 μM) and a lower detection limits (0.03 nM). Both assays were successfully applied to the analysis of (spiked) genuine food samples.

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Microchimica Acta

Tập 186

1-8

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