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Tri‑metallic (Ni–Ce–Cu)‑based metal–organic framework for highly efficient electrochemical detection of l‑cysteine KCI 등재
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/428182
This work describes Ni–Ce–Cu metallic–organic framework (MOF) for the detection of non-essential amino acid l-cysteine. The tri-metallic Ni–Ce–Cu MOF was synthesized via a solvothermal method. The cyclic voltammetry and the differential pulse voltammetry techniques were used to examine the electrochemical detection of l-cysteine. The Ni–Ce–Cu MOF shows an oxidation peak in PB solution at pH 3.0 between the potential range of 0.0 and 0.7 V and strong electro-catalytic activity toward the oxidation of l-cysteine across a wide linear range of 0.1 to 250 nM and low detection limit (LOD) was calculated of 1.56 nM. The analysis of l-cysteine in milk and egg yolk samples showed with recovery range of 96.75–103.5% and 97.78–99.43% with RSD% of 2.3–3.2% and 2.7–7.2%, respectively. These results show the Ni–Ce–Cu MOF has high selectivity for l-cysteine detection in milk and egg samples.
Abstract
1 Introduction
2 Materials and methods
2.1 Chemicals and reagents
2.2 Instruments
2.3 Synthesis of Ni–Ce–Cu MOF
2.4 Fabrication of Ni–Ce–Cu MOF-modified electrode
2.5 Preparation of real sample analysis
3 Results and discussion
3.1 Characterization of Ni–Ce–Cu MOF
3.2 Electrochemical performance of Ni–Ce–Cu MOF
3.3 The possible electro-catalytic mechanism of Cys-SH oxidation
3.4 Effect of pH and scan rate
3.5 Electrocatalytic oxidation of l-Cys-SH
3.6 Differential pulse voltammetry analysis of l-Cys-SH
3.7 Selectivity of Ni–Ce–Cu MOF-based Cys-SH sensor
3.8 Stability and repeatability
3.9 Determination of Cys-SH in real samples
4 Conclusions
Anchor 21
Acknowledgements
References
