Journal
MATERIALS & DESIGN
Volume 199, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2020.109409
Keywords
Aptamer; CAP; PEI-rGO; AuNCs; Electrochemical
Categories
Funding
- National Natural Science Foundation of China [51162026]
- Major Project of Fundamental and Application Research of the Department of Education of Guangdong Province [2015KTSCX132, 2017KZDXM080]
- Science and Technology Foundation of Huizhou [2019X0705016]
- Natural Science Foundation of Guangdong Province [2018A030313235]
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The study developed an electrochemical aptasensor for the detection of Chloramphenicol using PEI-rGO/AuNCs composite as electrode modification material, achieving signal amplification. The aptamers binding Chloramphenicol were immobilized on the gold electrode modified with PEI-rGO/AuNCs via Au-S affinity, showing good accuracy and detection limit in Chloramphenicol detection.
Developing a simple and reliable method for the detection of the highly concerning antibiotic, Chloramphenicol (CAP), is of great importance to food safety monitoring. In this study, the authors take the advantages of polyethyleneimine-functionalized reduced graphene oxide and gold nanocubs (PEI-rGO/AuNCs) composite as electrode modification material to develop an electrochemical aptasensor for the detection of CAP using single-stranded DNA-binding protein. PEI-rGO/AuNCs warrants good electrical conductivity and a high surface-to-volume ratio to achieve the purpose of signal amplification. The CAP-binding aptamers were immobilized on the PEI-rGO/AuNCs modified gold electrode via Au-S affinity. Based on the property that single-stranded DNA-binding protein (SSB) can bind to free single-stranded oligonucleotides without binding to folded oligonucleotides, in the presence of CAP, only a small number of SSB will be immobilized on the aptasensor surface results in a larger peak current, which is typically measured at 0.176 V (vs. Ag/AgCl). The assay has a linear response in the 5 pmol.L-1 to 1 mu mol.L-1 concentration range, with a 2.08 pmol.L-1 detection limit. Moreover, the proposed method has been applied to detect CAP in spiked chicken samples with satisfactory results. (c) 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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