| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5749399 | Environmental Pollution | 2017 | 9 Pages |
â¢A GQDs-MnO2 based assay with turn-on fluorescence was developed for AChE detection with high sensitivity and selectivity.â¢This assay could be used to monitor AChE fluctuation in CSF samples of rat directly.â¢It could be further applied for monitoring OPs poisoning and guiding the clinical treatment with AChE as a biomarker.
In this study, we demonstrated an assay with turn-on fluorescence for monitoring cerebrospinal acetylcholinesterase (AChE) fluctuation as a biomarker for organophosphorus pesticides (OPs) poisoning and management based on single layer MnO2 nanosheets with graphene quantum dots (GQDs) as signal readout. Initially, the fluorescence of GQDs was quenched by MnO2 nanosheets mainly due to the inner filter effect (IFE). However, with the presence of reductive thiocholine (TCh), the enzymatic product, hydrolyzed from acetylthiocholine (ATCh) by AChE, the redox reaction between MnO2 and TCh occurred, leading to the destruction of the MnO2 nanosheets, and thereby IFE was diminished gradually. As a consequence, the turn-on fluorescence of GQDs with the changes in the spectrum of the dispersion constituted a new mechanism for sensing of cerebrospinal AChE. With the method developed here, we could monitor cerebrospinal AChE fluctuation of rats exposed to OPs before and after therapy, and could thereby open up the pathway to a new sensing platform for better understanding the mechanism of brain dysfunctions associate with OPs poisoning.
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