A Label-Free Electrochemical Impedance Genosensor Coupled with Recombinase Polymerase Amplification for Genetically Modified Maize Detection

Dandan Cui, Shanshan Zhai, Yao Yang, Yuhua Wu, Jun Li, Xiaohong Yan, Ping Shen, Hongfei Gao and Gang Wu
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Dandan Cui: Key Laboratory of Agricultural Genetically Modified Organisms Traceability of the Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
Shanshan Zhai: Key Laboratory of Agricultural Genetically Modified Organisms Traceability of the Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
Yao Yang: Key Laboratory of Agricultural Genetically Modified Organisms Traceability of the Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
Yuhua Wu: Key Laboratory of Agricultural Genetically Modified Organisms Traceability of the Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
Jun Li: Key Laboratory of Agricultural Genetically Modified Organisms Traceability of the Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
Xiaohong Yan: Key Laboratory of Agricultural Genetically Modified Organisms Traceability of the Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
Ping Shen: Development Center of Science and Technology, Ministry of Agriculture and Rural Affairs, Beijing 100176, China
Hongfei Gao: Key Laboratory of Agricultural Genetically Modified Organisms Traceability of the Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
Gang Wu: Key Laboratory of Agricultural Genetically Modified Organisms Traceability of the Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China

Agriculture, 2022, vol. 12, issue 4, 1-12

Abstract: As the cultivation scale of genetically modified (GM) crops strongly increases, a convenient DNA assay is highly demanded in resource-limited areas. A label-free electrochemical impedance (EI) genosensor using gold carbon dots (GCDs) was developed with easy-to-use portable device. GCDs were used to modify screen-printed carbon electrode and immobilize capture probes by conducting a simple protocol. After the amplification products anchored on the sensor surface via hybridization reactions, the EI signal increased due to the formation of biocomplex hampering the interfacial electron transfer. Under the optimal conditions, the proposed genosensor coupled with recombinase polymerase amplification (RPA) could detect maize Ruifeng12-5 in a linear range of 0.10–5.0% with a detection limit of 0.10%. In addition, combined with a one-step extraction and RPA amplification, the proposed sensor device can be applied in resource-limited laboratories without expensive instruments or professionals. Therefore, the developed method provides an easy-to-use and sensitive platform for GM organism detection.

Keywords: electrochemical impedance; genosensor; gold carbon dots; recombinase polymerase amplification; genetically modified organisms (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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