Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 345, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.130387
Keywords
Graphene oxide quantum dots; Nanotree; DNA walker; Aptasensor; AFB(1)
Funding
- Breeding Plan of Shandong Provincial Qingchuang Research Team (2019)
- Qingdao Science and Technology Fund [21-1-4-sf-6-nsh]
- National Key Research and Development Program [2016YFD0400105]
- Qingdao Agricultural University
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A fluorescence aptasensor based on DNA walker, DNA tetrahedron nanostructures, and network hybridization chain reaction was proposed for monitoring Aflatoxin B-1 (AFB(1)). The sensor could sensitively detect AFB(1) by utilizing a DNA walker as a signal amplifier and combining DTNs and HCR.
Aflatoxin B-1 (AFB(1)) is the most toxic metabolite of mycotoxins and constantly contaminates food crops, which seriously endangers human health. Therefore, it is essential to explore a rapid and sensitive method for AFB(1) detection. Herein, a fluorescence aptasensor based on DNA walker, DNA tetrahedron nanostructures (DTNs) and network hybridization chain reaction (HCR) for monitoring AFB(1) was proposed. DNA walker structure was employed as signal amplifier induced by targets AFB(1) where DNA walker chain could walk on a three-dimensional track of gold nanoparticles (AuNPs) and combine complementary sequences of DTNs, triggering the cutting of endonuclease and releasing a lot of DTNs. DTNs were fabricated by four single-stranded DNA, which have multiple fulcrums. DTNs provided multiple reaction orientations for HCR and improved the assembly rate of graphene oxide quantum dots (GQDs) based nanotree. In presence of target AFB(1), target AFB(1) would bind with aptamers and trigger secondary signal amplification to achieve sensitive detection. This aptasensor could sensitively detect AFB(1) in a linear range of 1 1000 pg/mL with a detection limit as low as 0.492 pg/mL. In addition, this method can also be employed in monitoring other hazardous substances.
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