A novel sensitive electrochemical DNA biosensor for assaying of anticancer drug leuprolide and its adsorptive stripping voltammetric determination
ABSTRACT The anticancer drug, leuprolide (LPR) bound to double-stranded fish sperm DNA (dsDNA) which was immobilized onto the surface of an anodically activated pencil graphite electrode (PGE), was employed for designing a sensitive biosensor. The interaction of leuprolide (LPR) with double-stranded DNA (dsDNA) immobilized onto pencil graphite electrode (PGE) have been studied by electrochemical methods. The mechanism of the interaction was investigated and confirmed by differential pulse voltammetry using two different interaction methods; at the PGE surface and in the solution phase. The decrease in the guanine oxidation peak current was used as an indicator for the interaction in acetate buffer at pH 4.80. The response was optimized with respect to accumulation time, potential, drug concentration, and reproducibility for both interaction methods. The linear response was obtained in the range of 0.20-6.00 ppm LPR concentration with a detection limit of 0.06 ppm on DNA modified PGE and between 0.20 and 1.00 ppm concentration range with detection limit of 0.04 ppm for interaction in solution phase method. LPR showed an irreversible oxidation behavior at all investigated pH values on a bare PGE. Differential pulse adsorptive stripping (AdSDPV) voltammetric method was developed for the determination of LPR. Under these conditions, the current showed a linear dependence with concentration within a range of 0.005-0.20 ppm with a detection limit of 0.0014 ppm. Each determination method was fully validated and applied for the analysis of LPR in its pharmaceutical dosage form.
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ABSTRACT: Interaction of an antipsychotic agent, aripiprazole, with calf thymus double stranded deoxyribonucleic acid, ct-dsDNA, was investigated by differential pulse voltammetry (using two methods; interaction on the dsDNA modified electrode surface and in solution phase) and UV–VIS spectrophotometry. The binding constant between dsDNA and aripiprazole, K, about 3 × 105 M−1 was obtained spectrophotometrically in 0.1 M acetate buffer, at pH 4.7. Moreover, the DNA-drug association interaction was confirmed by the differential pulse (DP) voltammetric and spectrophotometric investigations of the systems aripiprazole – polyGuanine (polyG) and aripiprazole – polyAdenine (polyA) in solution phase. The interaction between aripiprazole and damaged ct-dsDNA was also investigated using differential pulse voltammetry.Electrochimica Acta 07/2015; 169. DOI:10.1016/j.electacta.2015.04.087
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ABSTRACT: In this study a novel biosensor for determination of taxol is described. The interaction of taxol with salmon-sperm double-stranded DNA (ds-DNA) based on the decreasing of the oxidation signals of guanine and adenine bases was studied electrochemically with a pencil-graphite electrode (PGE) using a differential pulse voltammetry (DPV) method. The decreases in the intensity of the guanine and adenine oxidation signals after interaction with taxol were used as indicator signals for the sensitive determination of taxol. DPV exhibits a linear dynamic range of 2.0×10−7–1.0×10−5 M for taxol with a detection limit of 8.0×10−8 M. Finally, this modified electrode was used for determination of taxol in some real samples.Talanta 11/2014; 134. DOI:10.1016/j.talanta.2014.10.063
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ABSTRACT: In this study, a new probe based on immobilization of amino linked oligonucleotide (NH2-linked DNA) on poly(glycidyl methacrylate-co-vinylferrocene)-coated Pt electrode was fabricated for the electrochemical detection of PTEN gene from human prostate tissues. The experimental parameters such as DNA immobilization time, DNA concentration, and target concentration were optimized. The selectivity of the NH2-linked DNA probe was assessed with mismatch (MM) and noncomplementary (NC) sequences. The applicability of the NH2-linked DNA probe to the PCR amplified samples correspond to PTEN gene from prostate tissues was evaluated. The immobilization of DNA on the copolymer was confirmed by FTIR, AFM, CV and DPV analysis. The PCR products were also identified by using agarose gel electrophoresis. The prepared probe indicated a linear range (10–100 μg mL−1) with a detection limit (4.7 μg mL−1) and a good selectivity of the NH2-linked DNA probe toward target DNA sequence. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40638.Journal of Applied Polymer Science 08/2014; 131(16). DOI:10.1002/app.40638