scholarly journals Electrochemical Sensor Based on Carbon Paste Modified by Cobalt(II) Porphyrin for Ascorbic Acid Determination

2021 ◽  
Author(s):  
Samuel de Almeida Caldeira ◽  
Daniela Nunes da Silva ◽  
Arnaldo César Pereira
Keyword(s):  
Ascorbic Acid ◽  
Electrochemical Sensor ◽  
Carbon Paste ◽  
Ascorbic Acid Determination ◽  
Acid Determination

scholarly journals Ascorbic acid determination using a carbon paste electrode modified with iron(III) ions adsorbed on humic acid

2006 ◽  
Vol 31 (4) ◽  
pp. 39-43 ◽  
Author(s):  
L. S. Silva ◽  
T. N. Oliveira ◽  
M. A. Ballin ◽  
C. R. M. Peixoto
Keyword(s):  
Ascorbic Acid ◽  
Carbon Paste Electrode ◽  
Oxidation Process ◽  
Supporting Electrolyte ◽  
Cyclic Voltammogram ◽  
Carbon Paste ◽  
Oxidation Current ◽  
Ascorbic Acid Determination ◽  
Paste Electrode ◽  
Acid Determination

An amperometric sensor was constructed, by using humic acids to immobilize Fe3+ ions on a carbon paste electrode (CPE-HA-Fe), and used for ascorbic acid (H2A) determination. The cyclic voltammogram of the electrode showed electrochemical response due to the Fe3+/Fe2+ couple at E1/2=+0.78 V vs SCE, using 0.5 mol L-1 KCl and 0.2 mol L-1 acetate/0.020 mol L-1 phosphate buffer, at pH = 5.4, as supporting electrolyte. When H2A is added to the electrolyte solution it is observed an oxidation process. The oxidation current, obtained by chronoamperommetry at +0.87 V vs SCE, is proportional to the concentration, represented by the equation I(µA) = 7.6286 [H2A] (mmol L-1) + 1.9583, r = 0.9996, for concentrations between 0.0 and 1.4 mmol L-1. The electrode showed high stability and was used for H2A determination in a natural orange juice.

Molecularly imprinted electrochemical sensor for ascorbic acid determination based on MXene modified electrode

2021 ◽  
Vol 285 ◽  
pp. 129158
Author(s):  
Qiuguo Wang ◽  
Xiangyue Xiao ◽  
Xinwen Hu ◽  
Liangbin Huang ◽  
Ting Li ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Electrochemical Sensor ◽  
Modified Electrode ◽  
Molecularly Imprinted ◽  
Ascorbic Acid Determination ◽  
Acid Determination

Amperometric sensor for L-ascorbic acid determination based on MnO 2 bulk modified screen printed electrode

2000 ◽  
Vol 368 (5) ◽  
pp. 466-470 ◽  
Author(s):  
E. Turkusic ◽  
V. Milicevic ◽  
H. Tahmiscija ◽  
M. Vehabovic ◽  
S. Basic ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Amperometric Sensor ◽  
Screen Printed Electrode ◽  
Ascorbic Acid Determination ◽  
Acid Determination ◽  
Screen Printed
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