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Investigation of polyviologens as oxygen indicators in food packaging

Roberts, L, Lines, R, Reddy, S and Hay, J (2011) Investigation of polyviologens as oxygen indicators in food packaging SENSOR ACTUAT B-CHEM, 152 (1). 63 - 67. ISSN 0925-4005

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Abstract

A triggered oxygen indicator, formulated from a combination of electrochrome, titanium dioxide and EDTA, was evaluated for use in modified atmosphere packaging. Methylene blue was not an ideal electrochrome due to its slow reduction to the leuco form and fast subsequent oxidation by oxygen present at low concentrations, >0.1%. Polyviologen electrochromes showed much faster reduction after exposure to UV light. Thionine and 2,2′-dicyano-1,1′-dimethylviologen dimesylate, which have more anodic reduction potentials compared to methylene blue, can be used to produce oxygen indicators with decreased sensitivity to oxygen. These indicators can be used to detect oxygen even when levels increase up to 4.0%.

Item Type: Article
Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in Sensors and Actuators B: Chemical. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Sensors and Actuators B: Chemical, 152(1), February 2011, DOI 10.1016/j.snb.2010.09.047.
Uncontrolled Keywords: Oxygen indicator, Optical sensor, Viologen, Polyviologen, Food packaging, ATMOSPHERE, INKS
Divisions: Faculty of Engineering and Physical Sciences > Chemistry
Depositing User: Symplectic Elements
Date Deposited: 02 Dec 2011 12:05
Last Modified: 23 Sep 2013 18:54
URI: http://epubs.surrey.ac.uk/id/eprint/29728

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