期刊
MICROCHIMICA ACTA
卷 188, 期 1, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-020-04666-0
关键词
Deoxynivalenol; Aptasensor; NiFe2O4 NTs; Thi-Au@Pt NRs-cDNA
资金
- National Natural Science Foundation of China [61301037]
- Program for Science and Technology Innovation Talents in Universities of Henan Province [20HASTIT002]
- Cultivation Plan for Young Core Teachers in Universities of Henan Province [2017GGJS072]
- National Engineering Laboratory for Wheat & Corn Further Processing, Henan University of Technology [NL2018004]
A novel aptasensor for deoxynivalenol detection was developed, utilizing aptamers as biological recognition elements and a specific signal transduction mechanism to achieve target detection, exhibiting good sensitivity and reproducibility.
A signal off aptasensor has been developed to detect deoxynivalenol (DON). DON aptamers (Apt) were used as biological recognition elements, nickel ferrite nanotubes (NiFe2O4 NTs) are used as the base material to increase the surface area of the electrode, and the Au@Pt NRs were used as carriers for loading signal labels thionine (Thi) and complementary strand (cDNA). In the presence of DON it will be specifically captured by Apt, then the competition mechanism was triggered; the signal molecules fall off from the electrode surface, which then causes the electrode signal to decrease. NiFe2O4 NTs and Au@Pt NRs were characterized by transmission electron microscope (TEM), scanning electron micrograph (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The designed sensor provides a concentration range of 1x10(-8) to 5x10(-4) mg mL(-1) and limit of detection of 3.02x10(-9) mg mL(-1). Determination of DON in corn meal samples was investigated and the recovery was 98.4 to 103.5%. The proposed aptasensor displayed good sensitivity, high specificity, and acceptable reproducibility. Based on NiFe2O4 NTs as substrate material and Au@Pt NRs as signal label prepared DON aptasensor for the determination of DON.
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