Sensitive and Efficient Electrochemical Determination of Kojic Acid in Foodstuffs Based on Graphene-Pt Nanocomposite-Modified Electrode

2013 ◽  
Vol 7 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Li Wang ◽  
Wei Qi ◽  
Rongxin Su ◽  
Zhimin He
Keyword(s):  
Modified Electrode ◽  
Kojic Acid ◽  
Electrochemical Determination

scholarly journals Electrochemical determination of ascorbic acid at p-phenylenediamine film-holes modified glassy carbon electrode

2015 ◽  
Vol 80 (9) ◽  
pp. 1161-1175 ◽  
Author(s):  
Bikila Olana ◽  
Shimeles Kitte ◽  
Tesfaye Soreta
Keyword(s):  
Ascorbic Acid ◽  
Detection Limit ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Linear Response ◽  
Modified Electrodes ◽  
Electrochemical Determination ◽  
Carbon Electrode

In this work the determination of ascorbic acid (AA) at glassy carbon electrode (GCE) modified with a perforated film produced by reduction of diazonium generated in situ from p-phenylenediamine (PD) is reported. Holes were intentionally created in the modifier film by stripping a pre-deposited gold nanoparticles. The modified electrodes were electrochemically characterized by common redox probes: hydroquinone, ferrocyanide and hexamineruthenium(III). The cyclic voltammetric and amperometric response of AA using the modified electrodes was compared with that of bare GCE. The bare GCE showed a linear response to AA in the concentration range of 5 mM to 45 mM with detection limit of 1.656 mM and the modified GCE showed a linear response to AA in the concentration range of 5 ?M to 45 ?M with detection limit of 0.123 ?M. The effect of potential intereferents on amperometric signal of AA at the modified GCE was examined and found to be minimal. The inter-electrode reproducibility, stability, and accuracy were determined. The modified electrode showed excellent inter-electrode reproducibility, accuracy and stability. The modified electrode reported is a promising candidate for use in electroanalysis of AA.

scholarly journals Electrochemical Determination of Nitrite by Au Nanoparticle/Graphene-Chitosan Modified Electrode

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 1986 ◽  
Author(s):  
Rijian Mo ◽  
Xuehua Wang ◽  
Qiong Yuan ◽  
Xiemin Yan ◽  
Tiantian Su ◽  
...  
Keyword(s):  
Modified Electrode ◽  
Electrochemical Determination ◽  
Au Nanoparticle
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