Voltammetric determination of glucose based on reduction of copper(II)-glucose complex at lanthanum hydroxide nanowire modified carbon paste electrodes

Li Liu; Jun-feng Song; Peng-fei Yu; Bin Cui

doi:10.1016/j.talanta.2006.08.042

Voltammetric determination of glucose based on reduction of copper(II)-glucose complex at lanthanum hydroxide nanowire modified carbon paste electrodes

Talanta. 2007 Mar 30;71(5):1842-8. doi: 10.1016/j.talanta.2006.08.042. Epub 2006 Nov 28.

Authors

Li Liu¹, Jun-feng Song, Peng-fei Yu, Bin Cui

Affiliation

¹ Institute of Analytical Science, Northwest University, Xi'an 710069, China.

PMID: 19071531
DOI: 10.1016/j.talanta.2006.08.042

Abstract

A novel voltammetric method for the determination of beta-d-glucose (GO) is proposed based on the reduction of Cu(II) ion in Cu(II)(NH(3))(4)(2+)-GO complex at lanthanum(III) hydroxide nanowires (LNWs) modified carbon paste electrode (LNWs/CPE). In 0.1mol L(-1) NH(3).H(2)O-NH(4)Cl (pH 9.8) buffer containing 5.0x10(-5)mol L(-1) Cu(II) ion, the sensitive reduction peak of Cu(II)(NH(3))(4)(2+)-GO complex was observed at -0.17V (versus, SCE), which was mainly ascribed to both the increase of efficient electrode surface and the selective coordination of La(III) in LNW to GO. The increment of peak current obtained by deducting the reduction peak current of the Cu(II) ion from that of the Cu(II)(NH(3))(4)(2+)-GO complex was rectilinear with GO concentration in the range of 8.0x10(-7) to 2.0x10(-5)mol L(-1), with a detection limit of 3.5x10(-7)molL(-1). A 500-fold of sucrose and amylam, 100-fold of ascorbic acid, 120-fold of uric acid as well as gluconic acid did not interfere with 1.0x10(-5)mol L(-1) GO determination.