Label-Free and Highly-Sensitive Detection of Ochratoxin A Using One-Pot Synthesized Reduced Graphene Oxide/Gold Nanoparticles-Based Impedimetric Aptasensor
Autor: | Shuai Zhi, Yingying Li, Yiying Gong, Yasmin Alhamoud, Danting Yang, Haibo Zhou, Ragwa Al-Wazer |
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Rok vydání: | 2021 |
Předmět: |
Ochratoxin A
lcsh:Biotechnology Aptamer Clinical Biochemistry Oxide Metal Nanoparticles Wine 02 engineering and technology Biosensing Techniques 01 natural sciences Article law.invention Nanocomposites chemistry.chemical_compound law Limit of Detection lcsh:TP248.13-248.65 Humans Electrodes three-dimensional reduced graphene oxide Nanocomposite Chromatography Graphene 010401 analytical chemistry Reproducibility of Results aptamer General Medicine Electrochemical Techniques Aptamers Nucleotide 021001 nanoscience & nanotechnology Ochratoxins Carbon 0104 chemical sciences Dielectric spectroscopy electrochemical biosensor chemistry Colloidal gold Dielectric Spectroscopy gold nanoparticles Electrode Graphite Gold 0210 nano-technology |
Zdroj: | Biosensors Biosensors, Vol 11, Iss 87, p 87 (2021) Volume 11 Issue 3 |
ISSN: | 2079-6374 |
Popis: | Ochratoxin A (OTA) primarily obtained by the genera aspergillus and penicillium, is one of the toxic substances for different organs and systems of the human body such as the kidney, liver, neurons and the immune system. Moreover, it is considered to cause tumors and fetal malformation even at a very low concentration. Fast and sensitive assay for detection of OTA at ultralow levels in foods and agricultural products has been an increasing demand. In this study, a new label-free electrochemical biosensor based on three-dimensional reduced graphene oxide/gold nanoparticles/aptamer for OTA detection was constructed. The 3D-rGO/Au NPs nanocomposites were firstly synthesized using a one-pot hydrothermal process under optimized experimental conditions. The 3D-rGO/Au NPs with considerable particular surface area and outstanding electrical conductivity was then coated on a glass carbon electrode to provide tremendous binding sites for -SH modified aptamer via the distinctive Au–S linkage. The presence of OTA was specifically captured by aptamer and resulted in electrochemical impedance spectroscopy (EIS) signal response accordingly. The constructed impedimetric aptasensor obtained a broad linear response from 1 pg/mL to 10 ng/mL with an LOD of 0.34 pg/mL toward OTA detection, highlighting the excellent sensitivity. Satisfactory reproducibility was also achieved with the relative standard deviation (RSD) of 1.393%. Moreover, the proposed aptasensor obtained a good recovery of OTA detection in red wine samples within the range of 93.14 to 112.75% along with a low LOD of 0.023 ng/mL, indicating its applicability for OTA detection in real samples along with economical, specific, susceptible, fast, easy, and transportable merits. |
Databáze: | OpenAIRE |
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