1 research outputs found
Ratiometric Fluorescent Sensor Based on Hydrogen-Bond Triggering the Internal Filter Effect for Enzyme-Free and Visual Monitoring Pesticide Residues
Real-time/field sensing techniques to keep track of methyl
parathion
(MP) are crucial to human health. In this work, a ratiometric fluorescence
probe was constructed by integrating green carbon dots and CdTe quantum
dots (CdTe QDs) for highly selective quantitative detection of MP.
Under alkaline conditions, MP can be rapidly hydrolyzed to produce
p-nitrophenol (p-NP); the instantaneous reaction that strengthens
the hydrogen bond results in the internal filter effect between the
carbon dots and p-NP, which quenches green fluorescence, thus leading
to an obvious and immediate change from green to red. The probe displayed
a sensitive limit of detection of 8.9 nM and exhibited a significant
linear response to MP residue concentrations in the range of 0–100
M. In addition, we have created a brand-new smartphone-based intelligent
detection tool by measuring the RGB value of the fluorescent probe
solution and the matching paper-based sensor, and we are able to visually
and quantitatively identify the levels of MP residues present in water,
apples, and vegetables. This ratiometric fluorescence sensing method
can realize rapid visual and quantitative detection of MP residues,
which provides a more reliable guarantee promising strategy for constructing
a risk detection technique for traces without enzymes