AI Article Synopsis
- The study addresses the need for better catalysts in electrochemical sensing of 5-hydroxytryptamine (5-HT), demonstrating the potential of Fe-Co bimetallic Prussian blue analogues (FeCo-PBAs) as effective electrocatalysts.
- The research shows that the optimized FeCo-PBA at a 0.5/1 M molar ratio provides high sensitivity (0.856 μA μM) and a low detection limit (8.4 nM) for 5-HT, along with impressive recoveries and minimal variability.
- This work highlights the strong performance and practicality of the FeCo-PBA sensor in real sample analyses, positioning it as a competitive alternative to existing expensive catalyst options
Article Abstract
Lack of highly efficient, inexpensive, and easily available catalysts severely limits the practical applicability of electrochemically sensing assay towards 5-hydroxytryptamine (5-HT). Herein, four kinds of Fe-Co bimetallic Prussian blue analogues (FeCo-PBAs) with different molar ratios of Fe to Co were prepared using a simple coprecipitation method. Interestingly, Fe(III) in K [Fe(CN)] can be reduced to Fe(II) by adding trisodium citrate dehydrate, which could offer a new clue to synthesize PBAs with Fe(II) core ions. With the optimizational FeCo-PBA synthesized at a 0.5/1 M ratio of Fe to Co as an electrocatalyst, the constructed sensor shows excellent comprehensive performance for the 5-HT assay with a high sensitivity of 0.856 μA μM and an ultralow detection limit of 8.4 nM. Under the optimum conditions, linearity was obtained in the ranges of 0.1-10.0 μM and 10.0-200.0 μM and preferable recoveries ranged from 97.8% to 103.0% with relative standard deviation (RSD) < 4.0%. The integrated properties of FeCo-PBA can be comparable to previously reported electrocatalysts for the 5-HT assay including noble metal-based and expensive carbon (graphene and carbon nanotubes)-based electrocatalysts. The proposed sensor also exhibits outstanding selectivity, reproducibility, and practicality for real sample analyses. This work is the first report on the PBA-based sensor for the 5-HT assay, verifying the practicability of this high-performance sensor for the 5-HT assay.
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| http://dx.doi.org/10.1016/j.talanta.2022.124138 | DOI Listing |
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