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Single-Step LRET Aptasensor for Rapid Mycotoxin Detection
Jo, Eun-Jung,Byun, Ju-Young,Mun, Hyoyoung,Bang, Doyeon,Son, Jun Ho,Lee, Jae Young,Lee, Luke P.,Kim, Min-Gon American Chemical Society 2018 ANALYTICAL CHEMISTRY - Vol.90 No.1
<P>Contamination of foods by mycotoxins is a common yet serious problem. Owing to the increase in consumption of fresh produce, consumers have become aware of food safety issues caused by mycotoxins. Therefore, rapid and sensitive mycotoxin detection is in great demand in fields such as food safety and public health. Here we report a single-step luminescence resonance energy transfer (LRET) aptasensor for mycotoxin detection. To accomplish the single-step sensor, our sensor was constructed by linking a quencher-labeled aptamer through a linker to the surface of upconversion nanoparticles (UCNPs). Our LRET aptasensor is composed of Mn<SUP>2+</SUP>-doped NaYF<SUB>4</SUB>:Yb<SUP>3+</SUP>,Er<SUP>3+</SUP> UCNPs as the LRET donor, and black hole quencher 3 (BHQ3) as the acceptor. The maximum quenching efficiency is obtained by modulating the linker length, which controls the distance between the quencher and the UCNPs. Our distinctive design of LRET aptasensor allows detection of mycotoxins selectively in colored food samples within 10 min without multiple bioassay steps. We believe our single-step aptasensor has a significant potential for on-site detection of food contaminants, environmental pollutants, and biological metabolites.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2018/ancham.2018.90.issue-1/acs.analchem.7b02368/production/images/medium/ac-2017-02368a_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ac7b02368'>ACS Electronic Supporting Info</A></P>