Electrochemical sensing of ascorbic acid by a novel manganese(III) complex

Redox Active Cobalt-Bipyridine Metal Organic Framework-Nafion Coated Carbon Nanotubes for Sensing Ascorbic Acid

“…21,22 Therefore, redox mediators have been used to modify the electrode surface to suit for AA sensing. [23][24][25] For example, carbon-paste electrode (CPE) modified with Schiff base complex of cobalt (cobalt(II)-4-methyl salophen, (CoMSal)) 24 or N,N'-bis(3-ethoxysalicylidene)-4,5-dimetyl-1,2-phenylenediamino cobalt (II) chloride (CoL) with 1octanaminium,N,N,N-trioctyl bromide cationic surfactant 25 was used for the electrochemical oxidation of AA in presence of cysteine and dopamine (DA) in acetate buffer solution. The detection limit for AA in a DPV measurement, while using CoMSal and CoL are 8 × 10 −7 M and 4 × 10 −7 M respectively.…”

Formation of copper vanadate nanobelts and their electrochemical behaviors for the determination of ascorbic acid

“…Electrochemical methods provide the advantages of a fast and simple analysis process, high sensitivity, low detection limits, little or no sample preparation, simple operation and low cost. 31 The surface of the GCEs can be easily modied to enhance the sensitivity by the deposition of various layers, such as metal oxides and polymers. 18,32 In our previous research, ternary copper germanate nanowires were used as the GCE modied materials to investigate the electrochemical behaviors of ascorbic acid.…”

“…Only an irreversible anodic CV peak located at +0.04 V was observed from the CV curve. The electrochemical behaviors of ascorbic acid at disposable gold-based compact disk (G-CD) electrodes modied by [Mn(Phimp) 2 ](ClO 4 ) showed that only an increase of the anodic current was observed at a potential above 1.0 V. 31 No cathodic peak was observed due to the irreversibility of the electrocatalytic process. An irreversible anodic CV peak was also observed at +0.523 V and +0.534 V from the CV curve of 0.5 mM ascorbic acid at the carbon nanotube-N and Fe 3 O 4 @carbon nanotube-N modied electrode, respectively.…”

Development of a Novel Cu(II) Complex Modified Electrode and a Portable Electrochemical Analyzer for the Determination of Dissolved Oxygen (DO) in Water

“…Based on our previous experience about metal complexes as sensing elements for electrochemical sensors [7], we focused our attention on a novel Cu(II) complex as material for O2 reduction. The mononuclear copper (II) complex here proposed, [Cu (Phimp)(bipy)(ClO4)] (I), comprises bipy (2,2′-bipyridine) and Phimp (1-phenyl-1-(pyridin-2-yl)-2-(pyridin-2-ylmethylene) hydrazine) as bi-and tri-dentate ligand, respectively:…”