Samir Chandra Paul, Mohammad Arifur Rahman, Nur-E-Alam Siddique and A. M. Shafiqul Alam Department of Chemistry, University of Dhaka, Dhaka-1000, Bangladesh -------------------------------------------------------------------------------------------------------------------------------------------Abstract The speciation of arsenic in groundwater samples using Square Wave Anodic Stripping Voltamme...

The aim of this work is to present the experimental results in form an algorithm for analyzing modification screen printed electrodes, including possibility its regeneration irreversibly oxidizing biologically active compounds (drugs, DNA and proteins). A protocol was developed quantitative analysis study mechanism drug-DNA interaction by differential pulse voltammetry, following parameters: co...

The aim of this research was to develop a simple, selective and sensitive aptasensor for detection of Pb2+ based on hairpin structure of complementary strand (CS) of aptamer (Apt). Screen printed carbon electrode (SPCE) was electrodeposited by gold nanoparticles to be used as the substrate for the immobilization of Apt-CS. Moreover, gold nanoparticles (AuNPs) and thionine were added to increase...

The electrochemical oxidation behavior and voltammetric assay of gemifloxacin were investigated using differential-pulse and cyclic voltammetry on a screen-printed carbon electrode. The effects of pH, scan rates, and concentration of the drug on the anodic peak current were studied. Voltammograms of gemifloxacin in Tris-HCl buffer (pH 7.0) exhibited a well-defined single oxidation peak. A diffe...

Electrochemical oxidation of tramadol at pencil graphite electrode has been investigated using cyclic, differential pulse and square wave voltammetric techniques. In pH 9.2 phosphate buffer, tramadol showed an irreversible oxidation peak at 0.77 V. The dependence of the current on pH, concentration and scan rate was investigated to optimize the experimental conditions for the determination of t...

A selective and sensitive method for determination of copper in blood by adsorptive differential pulse cathodic stripping voltammetry is presented. The method is based on adsorptive accumulation of the complexes of Cu (II) ions with benzenesulfonyl hydrazide onto hanging mercury drop electrode (HMDE), followed by the reduction of the adsorbed species by differential pulse cathodic stripping vol...

A novel experimental methodology based on a Prussian blue (PB) and gold nanoparticles (AuNPs) modified carbon ionic liquid electrode (CILE) was developed for use in a label-free amperometric immunosensor for the sensitive detection of human immunoglobulin G (HIgG) as a model protein. The CILE was fabricated by using the ionic liquid 1-octyl-3-methylimidazolium hexafluorophosphate as binder. Con...

Resveratrol (3,3,4’-trans-trihydroxystilbene) is a polyphenolic phytoalexin that is produced by several plants as response to stress attack like UV exposure or fungus and bacteria infections [1]. It shows a variety of biological activities such as protection against atherosclerosis and against cardiovascular diseases and anticarcinogenic properties [2]. In recent years resveratrol has enjoyed a...

The feasibility of fabricating copper-sensitive chemically modified electrodes (CMEs) for trace analysis in aqueous and in 40% (v/v) ethanol-water media was investigated. Carbon paste electrodes modified with crown ethers were constructed by mixing the crown ethers into a graphite powder-paraffin oil matrix. The electrodes so formed were able to bind Cu(II) ions chemically and gave better volta...

Since the study of Al ion on the enzyme activity by using of electrochemical techniques was rarely found in available literatures, the differential-pulse polarography (DPP) technique was applied to study the effects of Al ion on the glutamate dehydrogenase (GDH) activity in the catalytical reaction of α-KG +NADH+NH4 ⇔ L-Glu+NAD+H2O by monitoring the DPP reduction current of NAD. At the plant an...