Functionalization of gold mercaptopropionic acid self-assembled monolayer with 5-amino-1,10-phenanthroline: Interaction with iron(II) and application for selective recognition of guanine

Selective Detection of Dopamine in the Presence of Ascorbic and Uric Acids through its Covalent Immobilization on Gold Mercaptopropionic Acid Self‐assembled Monolayer

“…The value of C dl decreases significantly, from Au to Au‐MPA, because of covering Au sites by MPA SAM leading to an increase in the film thickness; and then, increases from Au‐MPA to Au‐MPA‐DA(E/N) due to positive charges developed in the DA surface functions at pH 6.0. The “g” parameter, which is an indicative of surface inhomogeneity , closes to unity upon accumulation of DA on the surface.…”

“…(3) Regeneration is one of the most important features that have to be considered in fabrication of the sensors. Simple surface regeneration enhances the potential applicability of the sensor . We found that the Au‐MPA‐DA(E/N) electrode surface could be regenerated by cycling the electrode potential between −0.100 and +0.700 V (∼80 cycles) in PBS, pH 6.0, to remove the DA (Figure S4).…”

Construction of 5‐amino‐1,10‐phenanthroline‐Fe(II) Nanostructures on Glassy Carbon Electrode: Simultaneous and Selective Determination of Purine and Pyrimidine DNA Bases

“…Acid‐digested calf‐thymus double strand DNA (ds‐DNA) was prepared according to our previous report 23.…”

“…The pretreatment process modifies the electrode surfaces with specific functions such as carbonyl, carboxyl, and hydroxyl groups. The pretreated GC electrode was washed with double‐distilled water, and then, activated for at least 1.5 h in 0.1 M PBS, pH 5.5, containing 0.002 M EDC and 0.005 M NHS 23, 25. The activated GC electrode was rinsed with the same PBS and immediately placed into 1.0 mM 5Aphen aqueous solution at room temperature for 2 h to form GC‐5Aphen electrode, removed from the 5Aphen solution, rinsed with copiously of water to eliminate physically adsorbed 5Aphen, and, then, immersed in a Fe(II) solution at pH 5.0 to form GC‐5Aphen‐Fe(II) electrode.…”

“…In our recent work 23, gold mercaptopropionic acid self‐assembled monolayer (Au‐MPA SAM) was functionalized with the complex of 5‐amino‐1,10‐phenanthroline‐Fe(II) (5Aphen‐Fe(II)) for the first time and tested for possible determination of DNA bases. However, this electrode was able to detect only the guanine (GA) in the potential window of the SAMs available on Au electrode.…”