Hamilton, Anita and Breslin, Carmel B. (2014) The development of a highly sensitive urea sensor due to the formation of an inclusion complex between urea and sulfonated-β-cyclodextrin. Electrochimica Acta, 125. pp. 250-257. ISSN 0013-4686

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Abstract

A highly sensitive urea sensor was developed by incorporating the urease enzyme (Urs) into a polypyrrole film (PPy) in one simple electropolymerisation step, using a sulfonated-beta-cyclodextrin dopant. This PPy-Urs-SCD film has a superior sensitivity of 5.79 mu C mu M-1 and detection in the region of 1.0 x 10(-10) M urea, which is greater than other urea sensors reported in the literature. This is due to the formation of an inclusion complex between urea and a sulfonated-beta-cyclodextrin host in an aqueous solution, which was established using electrochemical techniques. Cyclic voltammetry was used to investigate the effect of an excess concentration of the sulfonated-beta-cyclodextrin on the currents recorded for urea. A clear reduction in the current was observed upon the addition of the sulfonated-beta-cyclodextrin. The formation constant, K-f, was computed as 2745 +/- 300 M-1, indicating the formation of a relatively strong inclusion complex. In addition, a 1:1 stoichiometry for the inclusion complex was deduced from a Job's plot analysis.

Item Type:	Article
Keywords:	Polypyrrole; Urea sensor; Urease; Cyclodextrin; Inclusion complexation;
Academic Unit:	Faculty of Science and Engineering > Chemistry
Item ID:	7710
Identification Number:	https://doi.org/10.1016/j.electacta.2014.01.096
Depositing User:	Dr. Carmel Breslin
Date Deposited:	11 Jan 2017 14:36
Journal or Publication Title:	Electrochimica Acta
Publisher:	Elsevier
Refereed:	Yes
URI:	http://www.sciencedirect.com
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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