Correlating Selective Electrocatalysis of Dopamine and Ascorbic Acid Electrooxidation at Nanoporous Gold Surfaces with Structural-Defects

2019 ◽  
Vol 166 (14) ◽  
pp. H704-H711 ◽  
Author(s):  
Abhishek Kumar ◽  
Josué M. Gonçalves ◽  
Jéssica S. G. Selva ◽  
Koiti Araki ◽  
Mauro Bertotti
Keyword(s):  
Ascorbic Acid ◽  
Nanoporous Gold ◽  
Structural Defects ◽  
Gold Surfaces

scholarly journals Mass transport in nanoporous gold and correlation with surface pores for EC1 mechanism: Case of ascorbic acid

2021 ◽  
Author(s):  
Rita Meunier-Prest ◽  
Abhishek Kumar ◽  
Josue M. Gonçalves ◽  
Vinicius L. Furtado ◽  
Koiti Araki ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Mass Transport ◽  
Nanoporous Gold ◽  
Surface Pores

Amperometric microsensor based on nanoporous gold for ascorbic acid detection in highly acidic biological extracts

2020 ◽  
Vol 1095 ◽  
pp. 61-70 ◽  
Author(s):  
Abhishek Kumar ◽  
Vinicius L. Furtado ◽  
Josué M. Gonçalves ◽  
Renata Bannitz-Fernandes ◽  
Luis Eduardo S. Netto ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Nanoporous Gold ◽  
Biological Extracts ◽  
Ascorbic Acid Detection

A novel nanoporous gold modified electrode for the selective determination of dopamine in the presence of ascorbic acid

2009 ◽  
Vol 69 (1) ◽  
pp. 105-108 ◽  
Author(s):  
Hua-Jun Qiu ◽  
Gui-Ping Zhou ◽  
Guang-Lei Ji ◽  
Yun Zhang ◽  
Xi-Rong Huang ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Modified Electrode ◽  
Nanoporous Gold ◽  
Selective Determination

scholarly journals Mechanisms of Reduced Astrocyte Surface Coverage in Cortical Neuron-Glia Co-cultures on Nanoporous Gold Surfaces

2016 ◽  
Vol 9 (3) ◽  
pp. 433-442 ◽  
Author(s):  
Christopher A. R. Chapman ◽  
Hao Chen ◽  
Marianna Stamou ◽  
Pamela J. Lein ◽  
Erkin Seker
Keyword(s):  
Cortical Neuron ◽  
Surface Coverage ◽  
Nanoporous Gold ◽  
Gold Surfaces

scholarly journals Potentiometric Biosensing of Ascorbic Acid, Uric Acid, and Cysteine in Microliter Volumes Using Miniaturized Nanoporous Gold Electrodes

Biosensors ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 10
Author(s):  
Christopher J. Freeman ◽  
Borkat Ullah ◽  
Md. Shafiul Islam ◽  
Maryanne M. Collinson
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Nanoporous Gold ◽  
Redox Potentials ◽  
Biologically Relevant ◽  
Redox Sensing ◽  
Redox Molecules

Potentiometric redox sensing is a relatively inexpensive and passive approach to evaluate the overall redox state of complex biological and environmental solutions. The ability to make such measurements in ultra-small volumes using high surface area, nanoporous electrodes is of particular importance as such electrodes can improve the rates of electron transfer and reduce the effects of biofouling on the electrochemical signal. This work focuses on the fabrication of miniaturized nanoporous gold (NPG) electrodes with a high surface area and a small footprint for the potentiometric redox sensing of three biologically relevant redox molecules (ascorbic acid, uric acid, and cysteine) in microliter volumes. The NPG electrodes were inexpensively made by attaching a nanoporous gold leaf prepared by dealloying 12K gold in nitric acid to a modified glass capillary (1.5 mm id) and establishing an electrode connection with copper tape. The surface area of the electrodes was ~1.5 cm2, providing a roughness factor of ~16 relative to the geometric area of 0.09 cm2. Scanning electron microscopy confirmed the nanoporous framework. A linear dependence between the open-circuit potential (OCP) and the logarithm of concentration (e.g., Nernstian-like behavior) was obtained for all three redox molecules in 100 μL buffered solutions. As a first step towards understanding a real system, the response associated with changing the concentration of one redox species in the presence of the other two was examined. These results show that at NPG, the redox potential of a solution containing biologically relevant concentrations of ascorbic acid, uric acid, and cysteine is strongly influenced by ascorbic acid. Such information is important for the measurement of redox potentials in complex biological solutions.

Electrocatalytic Determination of Ascorbic Acid Using a Palladium Coated Nanoporous Gold Film Electrode

2012 ◽  
Vol 24 (2) ◽  
pp. 368-375 ◽  
Author(s):  
Nahid Tavakkoli ◽  
Shekofe Nasrollahi ◽  
Gholamreza Vatankhah
Keyword(s):  
Ascorbic Acid ◽  
Gold Film ◽  
Nanoporous Gold ◽  
Film Electrode ◽  
Electrocatalytic Determination
Sign in / Sign up

Export Citation Format

Share Document