期刊
RSC ADVANCES
卷 12, 期 22, 页码 13727-13739出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ra00026a
关键词
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资金
- Western Grains Research Fellowship
- Saskatchewan Ministry of Agriculture - Agriculture Development Fund
- Alberta Wheat Commission
- Manitoba Crop Alliance
- Saskatchewan Wheat Development Commission
- Natural Sciences and Engineering Research Council
In this study, a FRET-based fluorescent aptasensor was optimized for the detection of ochratoxin A (OTA) by utilizing the quenching efficiency of single-walled carbon nanotubes (SWCNTs) and the binding affinity of aptamers. The results showed that acid-modified SWCNTs and the A08min aptamer exhibited better detection performance.
In this study, a FRET-based fluorescent aptasensor for the detection of ochratoxin A (OTA) was optimized based on the quenching efficiency of single-walled carbon nanotubes (SWCNTs) and the binding affinity of aptamers. OTA aptamers were conjugated with quantum dots and adsorbed to the surface of both acid-modified and unmodified SWCNTs. The maximum fluorescence quenching efficiency of the SWCNTs were compared. Acid-modified SWCNTs (amSWCNTs) have moderate quenching efficiency, providing an optimal sensitivity for qualitative fluorescence-enhancement biosensor assays. The binding parameters of the QD-modified OTA aptamers (1.12.2 and A08min) on the surface of amSWCNTs were compared. Based on our results, the A08min aptamer is a better candidate for OTA detection. Using the A08min aptamer, the SWCNT method had a limit of detection (LOD) of 40 nM. The amSWCNT method had a significantly lower LOD of 14 nM. Turn-on fluorescent nano-aptasensors are emerging as an effective diagnostic tool for simple detection of mycotoxins. Nanocomplexes designed for the detection of mycotoxins in solution and paper-based tests have proven to be useful.
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