Ultra-sensitive electrochemical aptasensor for label-free detection of Aflatoxin B1 in wheat flour sample using factorial design experiments
| Autor: | Hamideh Roshanfekr, Hossein Peyman, Faezeh Rahimi |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Aflatoxin B1
Materials science Aptamer Flour Immobilized Nucleic Acids Food Contamination 01 natural sciences Nanocomposites Analytical Chemistry 0404 agricultural biotechnology Limit of Detection Quantum Dots Triticum Detection limit Reproducibility Chromatography 010401 analytical chemistry Reproducibility of Results Electrochemical Techniques 04 agricultural and veterinary sciences General Medicine Repeatability Factorial experiment Aptamers Nucleotide 040401 food science Carbon 0104 chemical sciences Dielectric spectroscopy Dielectric Spectroscopy Differential pulse voltammetry Biosensor Food Analysis Food Science |
| Zdroj: | Food Chemistry. 343:128436 |
| ISSN: | 0308-8146 |
| DOI: | 10.1016/j.foodchem.2020.128436 |
| Popis: | Considering the significance of mycotoxin detection in food industries, herein, an ultrasensitive aptasensor was developed based on aflatoxin B1 aptamer immobilized on Carbon quantum dots/octahedral Cu2O nanocomposite. Electrochemical measurements were based on Electrochemical Impedance Spectroscopy (EIS) and Differential Pulse Voltammetry (DPV). Since the effective parameters (pH, temperature, incubation time and concentration of aptamers) are interdependent, so their dependent study can be nonideal. Taguchi method has solved this problem and optimized the experimental conditions using a smaller number of experiments. Under optimum conditions, the electrochemical signals declined as AFB1 concentrations increased with a dynamic range of 3 ag.ml−1 −1.9 µg.ml−1 and a low limit of detection (LOD) of 0.9 ± 0.04 ag ml−1. The obtained results proved sufficient repeatability (RSD = 2.4%), reproducibility (RSD = 2.56%), accuracy (97.2–104.4% recovery), and robustness (RSD = 3.25%). Furthermore, considerable selectivity, stability and reliability of the aptasensor confirmed the capability to work in future real assays. |
| Databáze: | OpenAIRE |
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