Showing papers by "Abdollah Salimi published in 2010"
TL;DR: In this article, a differential pulse voltammetry (DPV) was used for the detection of ethanol in chloropromazine and producing an electroactive redox couples which strongly adsorbed on the electrode surface modified with carbon nanotubes.
Abstract: Potential cycling was used for oxidation of chloropromazine and producing an electroactive redox couples which strongly adsorbed on the electrode surface modified with carbon nanotubes and ionic liquid nanocomposite. The modified electrode shows excellent electrocatalytic activity toward NADH oxidation. The differential pulse voltammetry detection provided high sensitivity, 0.5835 A M−1, low detection limit, 80 nM at concentration range up to 20 μM. An ethanol biosensor was also developed by immobilizing alcohol dehydrogenase enzyme onto nanocomposite. Differential pulse voltammetric detection of ethanol gives linear responses over the concentration range 40 μM–1.5 mM with detection limit 5 μM and sensitivity 1.97 μA mM−1.
45 citations
TL;DR: In this article, the authors showed that superoxide dismutase (Zn-SOD) displays a pair of well defined and nearly reversible redox peaks with formal potential (E°′) of −0.03 V in pH 7.4.
Abstract: Direct electron transfer of immobilized superoxide dismutase (Cu, Zn-SOD) onto silicon carbide (SiC) nanoparticles displays a pair of well defined and nearly reversible redox peaks with formal potential (E°′) of −0.03 V in pH 7.4. The heterogeneous electron transfer rate constant (ks) and surface coverage (Γ) of immobilized SOD are 11.0±0.4 s−1 and 1.42×10−11 mol cm−2. Biosensor shows fast amperometric response (3s) with sensitivity and detection limit of 1.416 nA μM−1, 1.66 μM, and 1.375 nA μM−1, 2.1 μM for cathodically or anodically detection of superoxide, respectively. This biosensor also exhibits good stability, reproducibility and long life-time.
24 citations
TL;DR: Sensitivity, selectivity, the liner concentration range and the detection limit of the developed sensor are all much better than all known similar sensors in the literature for iodate and periodate determination.
19 citations
TL;DR: In this article, a simple procedure was developed for the preparation of glassy carbon electrodes modified with single wall carbon nanotubes (SWCNTs) and multilayers of SiΜο 12 Ο 40 4− -[Ru(bpy)(tpy)Cl] + (byp; bipyridine, tpy; terpyridine).
19 citations
TL;DR: For the first time, silicon nitride (Si3N4) nanoparticles were used for preparation of electrochemical biosensor as mentioned in this paper, which exhibits facile and direct electrochemistry.
Abstract: For the first time silicon nitride (Si3N4) nanoparticles was used for preparation electrochemical biosensor. GOx immobilized on the Si3N4 nanoparticles exhibits facile and direct electrochemistry. The surface coverage and heterogeneous electron transfer rate constant (ks) of immobilized GOx were 6.3×10−13 mol cm−2 and 47.4±0.3 s−1. The sensitivity, linear concentration range and detection limit of the biosensor for glucose detection were 38.57 µA mM−1 cm−2, 25 µM to 8 mM and 6.5 µM, respectively. This biosensor also exhibits good stability, reproducibility and long life time. These indicate Si3N4 nanoparticles is good candidate material for construction of third generation biosensor and bioelectronics devices.
7 citations