期刊
ANALYTICA CHIMICA ACTA
卷 812, 期 -, 页码 41-44出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2013.12.041
关键词
Screen printed carbon electrodes; Sulfite oxidase; Tetrathiafulvalene; Sulfite; Wine
资金
- Spanish Ministry of Science and Innovation (MICINN) (INNPACTO SERIBIO)
- Junta de Castilla y Leon [BU212A12-2]
Screen-printed carbon electrodes have been modified with tetrathiafulvalene and sulfite oxidase enzyme for the sensitive and selective detection of sulfite. Amperometric experimental conditions were optimized taking into account the importance of quantifying sulfite in wine samples and the inherent complexity of these samples, particularly red wine. The biosensor responds to sulfite giving a cathodic current (at +200 mV vs screen-printed Ag/AgCl electrode and pH 6) in a wide concentration range, with a capability of detection of 6 p,M (alpha = beta = 0.05) at 60 degrees C. The method has been applied to the determination of sulfite in white and red samples, with averages recoveries of 101.5% to 101.8%, respectively. (C) 2014 Elsevier B.V. All rights reserved.
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