Redox voltammetry of sub-parts per billion levels of Cu2+ at polyaspartate-modified gold electrodes Yang, Wenrong, Gooding, J. Justin and Hibbert, D. Brynn 2001, Redox voltammetry of sub-parts per billion levels of Cu2+ at polyaspartate-modified gold electrodes, Analyst, vol. 126, no. 9, pp. 1573-1577, doi: 10.1039/B102898G. Attached Files Name Description MIMEType Size Downloads Title Redox voltammetry of sub-parts per billion levels of Cu2+ at polyaspartate-modified gold electrodes Formatted title Redox voltammetry of sub-parts per billion levels of Cu2+ at polyaspartate-modified gold electrodes Author(s) Yang, Wenrong orcid.org/0000-0001-8815-1951 Gooding, J. Justin Hibbert, D. Brynn Journal name Analyst Volume number 126 Issue number 9 Start page 1573 End page 1577 Publisher Royal Society of Chemistry Place of publication London, England Publication date 2001 ISSN 0003-2654 1364-5528 Summary An electrochemical sensor for the detection of Cu2+ is reported which incorporates poly-l-aspartic acid (PLAsp) with 32–96 aspartate units as a selective ligand for the metal ion. PLAsp is covalently attached to a gold electrode modified with a monolayer of 3-mercaptopropionic acid using carbodiimide coupling via an N-hydroxysuccinimide (NHS) ester intermediate. The acid side groups and deprotonated peptide nitrogens on two aspartate moieties are thought to be primarily responsible for chelation of Cu2+, which remains bound when reduced to Cu+. A consequence of the multiple binding points that are available with a polypeptide is the low detection limit. The lowest concentration detected was 3 nM (0.2 ppb) achieved with Osteryoung square wave voltammetry. This detection limit compares favourably with that of ICP-OES and previously reported cysteine-modified electrodes. Analysis of tap and lake water samples using the PLAsp-modified electrode agreed well with ICP-OES analysis of the same samples. Language eng DOI 10.1039/B102898G Field of Research 100703 Nanobiotechnology Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences HERDC Research category C1.1 Refereed article in a scholarly journal Copyright notice ©2001, The Royal Society of Chemistry Persistent URL http://hdl.handle.net/10536/DRO/DU:30034979 Document type: Journal Article Collection: Institute for Technology Research and Innovation Related Links Link Description Connect to published version (restricted access) Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Mon, 30 May 2011, 10:55:37 EST Mon, 12 Sep 2011, 11:31:04 EST Mon, 12 Sep 2011, 11:32:14 EST Mon, 16 Jun 2014, 18:02:42 EST Sat, 10 Feb 2018, 01:33:54 EST Filtered Full Citation counts:   Cited 68 times in TR Web of Science Cited 73 times in Scopus Search Google Scholar Access Statistics: 320 Abstract Views, 0 File Downloads  -  Detailed Statistics Created: Mon, 30 May 2011, 10:55:37 EST

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