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A novel type of carbon paste electrode modified by multi‐walled carbon nanotubes and antimony trioxide (Sb2O3/CNTCPE) was applied for square wave anodic stripping voltammetry (SWASV) of Cd2+ and Pb2+. Important parameters (deposition potential, deposition time, HCl concentration) were optimized and linear concentration dependence was obtained in the range of 10–100 ppb with LOD 1.7 ppb for Cd2+ and 1.2 ppb for Pb2+. The practical applicability was tested on the determination of Cd2+ and Pb2+ in tap water. The potentiometric stripping analysis at Sb2O3/CNTCPE was tested for the determination of Cd2+ and Pb2+ to compare this method with SWASV. [ABSTRACT FROM AUTHOR]

A novel type of carbon paste electrode modified by multi‐walled carbon nanotubes and antimony trioxide (Sb2O3/CNTCPE) was applied for square wave anodic stripping voltammetry (SWASV) of Cd2+ and Pb2+. Important parameters (deposition potential, deposition time, HCl concentration) were optimized and linear concentration dependence was obtained in the range of 10–100 ppb with LOD 1.7 ppb for Cd2+ and 1.2 ppb for Pb2+. The practical applicability was tested on the determination of Cd2+ and Pb2+ in tap water. The potentiometric stripping analysis at Sb2O3/CNTCPE was tested for the determination of Cd2+ and Pb2+ to compare this method with SWASV. [ABSTRACT FROM AUTHOR]

This work reports the application of bismuth bulk electrode (BiBE) for the determination of 2‐methyl‐4,6‐dinitrophenol (MDNP) by differential pulse voltammetry (DPV) in Britton‐Robinson buffer of pH 12.0 as an optimal medium. BiBE was prepared by transferring molten bismuth into a glass tube under constant stream of nitrogen. The linear concentration dependences were measured from 1 to 10 μmol ⋅ L−1 and from 10 to 100 μmol ⋅ L−1 by using optimum accumulation potential of −0.7 V and optimum accumulation time 30 s. Under these conditions limit of determination and limit of quantification was 0.45 and 1.5 μmol ⋅ L−1, respectively. The developed method was successfully applied for the analysis of tap water as a model sample. [ABSTRACT FROM AUTHOR]

Abstract: The present work explains the fabrication of a novel electrochemical aptasensor for identifying and measuring the epirubicin (Epi) by using curcumin (Cur) as an anticancer electrochemical indicator. The aptasensor prepared by immobilizing the thiolated aptamer on the surface of graphite screen‐printed electrode modified with gold nanoparticles/functionalized multiwall carbon nanotubes, ionic liquid and chitosan nanocomposite (AuNPs/FMWCNTs‐IL‐Chit/SPE). To evaluate the willingness of aptamer to interaction with Epi in the presence of complementary strand DNA, competitive binding assay between the complementary strand of aptamer and Epi were used. Cur tends to bound to the grooves of two strands DNA. With increasing the concentration of Epi in the range of 0.007–7.0 μM, the peak current of Cur decreased, due to the formation of aptamer‐Epi complex and decreasing the amount of complementary strand DNA. Through the control experiments, we examined the response of fabricated aptasensor for some anticancer drugs, which have a structure similar to the Epi. The results showed that using the thiol‐terminated aptamer as a recognition layer led to a sensor with a high tendency for Epi compared to other anticancer drugs. [ABSTRACT FROM AUTHOR]