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An electrospun poly(acrylonitrile-co-actylic acid) nanofiber mat (PAN-co-PAAnfm) was successfully collected on the surface of a glassy carbon electrode (GCE). Scanning electron microscope (SEM) images showed that the porous electrospun mat was composed of -160 nm diameter of uniform knitted nanofibers. The cationic luminescence probe, tris(2,2'-bipyridyl)ruthenium(Ii) complex ([Ru(bpy)3]2+), was innovatively and first incorporated into the negatively charged PAN-coPAA,-modified GCE via electrostatic interaction. Compared with the [Ru(bpy)3]2+ immobilized on normal PAN-co-PAA deposited coating, [Ru(bpy)3]2+/ PAN-co-PAAnfm exhibited dramatically enhanced electrochemical and electrochemiluminescence (ECL) performances, namely, more than 100 times higher ECL intensity could be feasibly obtained via the elecfrospinning technique. [ABSTRACT FROM AUTHOR]

Films containing [Os(bpy)2(PVP)10Cl]+ and [Ru(bpy)2- (PVP)10Cl]+ metallopolymers were assembled layer by layer on pyrolytic graphite electrodes to make sensors that selectively detect oxidized DNA. These films showed reversible, independent electrochemistry for electroactive Os3+/Os2+ and Ru3+/Ru2+ centers, with formal potentials of 0.34 and 0.76 V vs SCE, respectively. The combination of ruthenium and osmium metallopolymers in the films provided a catalytic Os square wave voltammetry (SWV) peak that is mainly selective for 8-oxoguanine and the detection of other oxidized nucleobases from the Ru peak. The method is applicable to measurements on DNA in solution or DNA incorporated into films. Using the Os SWV peak, 1 oxidized nucleobase in 6000 was detected. The sensor is simple and inexpensive, and the approach may be useful for the detection of oxidized DNA as a clinical biomarker for oxidative stress. [ABSTRACT FROM AUTHOR]

Studies methods for ruthenium isotope measurement by both positive and negative ion thermal ionization mass spectrometry. Mass fractionation and Ru isotope ratios; Isotope abundance and atomic weight of Ru.

Focuses on the accurate measurement of ruthenium isotopes by a form of mass spectrometry. Experimental section; Results and discussion.