title: Electrochemical DNA nano-biosensor for the study of spermidine-DNA interaction.
abstract: An electrochemical DNA nano-biosensor is prepared by immobilization of double stranded DNA (dsDNA) onto a mixed self-assembled monolayer (SAM) composed of azide- and hydroxyl-terminated thiols. The SAMs- and dsDNA-modified gold electrodes were characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The interaction of spermidine with DNA was studied by differential pulse voltammetry at the DNA-modified electrode. The decrease in the guanine oxidation peak current was used to study the interaction. The binding constant (K), obtained by differential pulse voltammetry, was 1.85 x 10(5)M(-1). A linear dependence of the guanine peak currents was observed in the range of 1.6-70.4 microM spermidine, with a detection limit of 0.72 microM and r=0.994 by using differential pulse voltammetry.
authors.affiliation: Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Mehdinia
authors.forename: S Habib
authors.initials: SH
authors.lastname: Kazemi
authors.forename: S Zahra
authors.initials: SZ
authors.lastname: Bathaie
authors.forename: Abdolhamid
authors.initials: A
authors.lastname: Alizadeh
authors.forename: Mojtaba
authors.initials: M
authors.lastname: Shamsipur
authors.forename: Mir Fazlollah
authors.initials: MF
authors.lastname: Mousavi
mesh_terms: D015374:Biosensing Techniques; D004247:DNA / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D006147:Guanine / Q000737:chemistry; D007202:Indicators and Reagents; D036103:Nanotechnology; D013095:Spermidine / Q000737:chemistry*; D013438:Sulfhydryl Compounds
chemical_list: D007202:Indicators and Reagents; D013438:Sulfhydryl Compounds; D006147:Guanine; D004247:DNA; D013095:Spermidine