A novel approach for the selective determination of tryptophan in blood serum in the presence of tyrosine based on the electrochemical reduction of oxidation product of tryptophan formed in situ on graphite electrode

2012 ◽  
Vol 31 (1) ◽  
pp. 26-31 ◽  
Author(s):  
Ali Özcan ◽  
Yücel Şahin
Keyword(s):  
Blood Serum ◽  
Electrochemical Reduction ◽  
Oxidation Product ◽  
Graphite Electrode ◽  
Selective Determination ◽  
Novel Approach

scholarly journals Electroanalytical Determination of Cadmium(II) and Lead(II) Using an in-situ Bismuth Film Modified Edge Plane Pyrolytic Graphite Electrode

2007 ◽  
Vol 23 (3) ◽  
pp. 283-289 ◽  
Author(s):  
Roohollah Torabi KACHOOSANGI ◽  
Craig E. BANKS ◽  
Xiaobo JI ◽  
Richard G. COMPTON
Keyword(s):  
Graphite Electrode ◽  
Pyrolytic Graphite ◽  
Bismuth Film ◽  
Pyrolytic Graphite Electrode

scholarly journals Determination of best groyne combination for mitigating bank erosion

2019 ◽  
Vol 21 (5) ◽  
pp. 875-892
Author(s):  
Kaushik Bora ◽  
Hriday Mani Kalita
Keyword(s):  
Optimization Model ◽  
Optimization Problem ◽  
Bank Erosion ◽  
Flow Speed ◽  
Low Flow ◽  
Test Cases ◽  
Meandering Channel ◽  
Novel Approach

Abstract This paper presents a novel approach for determining the best combination of groynes in terms of their number, lengths and positions for controlling bank erosion. The vulnerable bank is considered to be protected if a very small value of water flow speed is achieved on the near bank area. A linked simulation–optimization model is developed in this regard which minimizes the total construction cost of the groyne project. At the same time, a constraint in terms of low flow speed in a predefined zone is incorporated, which helps in bank erosion prevention. In the simulation model, the depth-averaged shallow water equations are solved using a finite difference scheme. The optimization problem is formulated in three different approaches to tackle different types of in situ field problems. Genetic algorithm (GA) is used to solve the optimization problem. The proposed optimization model is used in two hypothetical test cases including one straight channel and one meandering channel. The results obtained with all the three formulations are found to be logical and establish the potential of the present model for application in real cases.

scholarly journals Selective Determination of Dopamine in Presence of Ascorbic Acid Using Nafion Coated Methylene Blue Functionalized Graphite Electrode

2019 ◽  
Vol 31 (10) ◽  
pp. 2185-2190
Author(s):  
G. Sivasankari ◽  
K. Sivasankari ◽  
T. Nalini ◽  
P. Padmapriya ◽  
M. Nadhiya
Keyword(s):  
Methylene Blue ◽  
Ascorbic Acid ◽  
Modified Electrode ◽  
Electrode Surface ◽  
Graphite Electrode ◽  
Low Cost ◽  
Differential Pulse ◽  
Selective Determination ◽  
The Stability

An electrochemical sensor has been developed using methylene blue (MB) unctionalized graphite for the selective determination of dopamine in the presence of ascorbic acid. The immobilization of methylene blue on graphite was done by carbodiimide coupling method. The methylene blue functionalized graphite was characterized by SEM, FTIR spectroscopy and UV-visible spectroscopy. The immobilization of methylene blue functionalized graphite (MB-G) on the electrode surface was made by drop casting a small volume of MB-G dispersed methanol solution on the electrode surface. About 5 L of 0.5 % Nafion solution was also dropcasted for the stability and selectivity. The MB-G modified electrode was characterized by cyclic voltammetry. The modified electrode promotes the electrocatalytic oxidation of dopamine at a lower potential of 160 mV. The selective determination of dopamine in the presence of 100 times higher concentration of ascorbic acid was achieved by differential pulse voltammetry. The modified electrode offered a simple, selective and sensitive determination of low levels of dopamine. Also the oxidation over potential was reduced to an extent of 360 mV comparing with the bare graphite electrode. The proposed sensor has the advantage of easy fabrication, low cost, good sensitivity, reproducibility and stability.

Synthesis and application of a peroxidase-like molecularly imprinted polymer based on hemin for selective determination of serotonin in blood serum

2009 ◽  
Vol 631 (2) ◽  
pp. 170-176 ◽  
Author(s):  
Wilney de Jesus Rodrigues Santos ◽  
Phabyanno Rodrigues Lima ◽  
César Ricardo Teixeira Tarley ◽  
Nelci Fenalti Höehr ◽  
Lauro Tatsuo Kubota
Keyword(s):  
Blood Serum ◽  
Molecularly Imprinted Polymer ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Selective Determination

Functionalized-graphene modified graphite electrode for the selective determination of dopamine in presence of uric acid and ascorbic acid

2011 ◽  
Vol 81 (2) ◽  
pp. 104-108 ◽  
Author(s):  
Malledevaru Mallesha ◽  
Revanasiddappa Manjunatha ◽  
C. Nethravathi ◽  
Gurukar Shivappa Suresh ◽  
Michael Rajamathi ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Graphite Electrode ◽  
Functionalized Graphene ◽  
Selective Determination
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