scholarly journals Removal of methylene blue using magnetic multi-walled carbon nanotubes: process optimization study

2020 ◽  
Vol 932 ◽  
pp. 012015
Author(s):  
C C Lim ◽  
S H Shuit ◽  
S K Enche Ab Rahim ◽  
P Y Hoo ◽  
Q H Ng
Keyword(s):  
Carbon Nanotubes ◽  
Methylene Blue ◽  
Process Optimization ◽  
Optimization Study ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Nanobiocomposite-Based Bienzyme Screen-Printed Electrode for Glucose Monitoring

2012 ◽  
Vol 452-453 ◽  
pp. 909-912
Author(s):  
Saithip Pakapongpan ◽  
Surachai Thachepan ◽  
Yingyot Poo-Arporn ◽  
Rungtiva Palangsuntikul
Keyword(s):  
Carbon Nanotubes ◽  
Methylene Blue ◽  
Ascorbic Acid ◽  
Cyclic Voltammetry ◽  
Limit Of Detection ◽  
Glucose Monitoring ◽  
Screen Printed Electrode ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Screen Printed

Multi-walled carbon nanotubes (MWNTs) were coated first with methylene blue (MB) by noncovalent adsorption and then by horseradish peroxidase (HRP) and glucose oxidase (GOD) by covalent-linking. The MB-MWNTs/GOD/HRP composites formed stable films on screen-printed electrodes (SPE). The electrochemical and electrocatalytic behaviors of the bienzyme modified SPE were studied using cyclic voltammetry (CV) and amperometry. Using the MB-MWNT/GOD/HRP composites, glucose could be calibrated by amperometry at −0.35 V vs. SCE. The optimized response (at pH 7.0) had a sensitivity of 2.4 mA.M−1 and a limit of detection (3×S/N) of 35 µM. Tests of the portable bienzyme sensor demonstrate its imperviousness to the effects of ascorbic acid, uric acid and p-acetaminophen, as well as its ability to measure glucose concentrations ranging from 0.25 to 2 mM.

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