Ultrafast Ratiometric Detection of Aflatoxin B1 Based on Fluorescent β-CD@Cu Nanoparticles and Pt²⁺ Ions

Abstract

Rapid detection of aflatoxin B1 (AFB1) is a very important task in food safety monitoring. However, it is still challenging to achieve highly sensitive detection without antibody or aptamer biomolecules. In this work, a rapid detection of aflatoxin B1 was achieved using a ratiometric fluorescence probe without antibody or aptamer for the first time. In the ratiometric fluorescence system, the fluorescence emission of AFB1 at 433 nm was significantly enhanced due to the β-cyclodextrin–AFB1 host–guest interaction and the complexation of AFB1 and Pt2+. Meanwhile, the inclusion of aflatoxin B1 also quenched the fluorescence emission of β-CD@Cu nanoparticles (NPs) at 650 nm based on inner filter effect mechanism. On the basis of the above effects, the ratiometric detection of aflatoxin B1 was achieved in the range of 0.03–10 ng/mL with a low detection limit of 0.012 ng/mL (3σ/s). In addition, the β-CD@Cu NPs based nanoprobe could achieve stable response within 1 min to AFB1. The above ratiometric detection also demonstrated excellent application potential in the rapid on-site detection of AFB1 in food due to the advantages of convenience, rapidness, and high accuracy.

The construction of dual-emissive ratiometric fluorescent probes based on fluorescent nanoparticles for the detection of metal ions and small molecules

“…Based on the fact that β-CD could significantly enhance the fluorescence of aflatoxin B1(AFB1) by encapsulating AFB1 into the host of β-CD and Pt 2+ could further enhance the fluorescence of AFB1 by the formation of a coordination complex, β-CD@Cu NPs with single emission at 650 nm were prepared by chemically bonding fluorescent Cu NPs with SH-β-CD for the detection of AFB1. 263 With the addition of AFB1 and Pt 2+ , a new blue fluorescence emission at 433 nm originating from AFB1 appeared due to the β-CD–AFB1 host–guest interaction and the complexation of AFB1 and Pt 2+ . Meanwhile, the red fluorescence emission of Cu NPs was quenched based on IFE between AFB1 and Cu NPs.…”