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PUO was immobilized by cross\u2010linking on screen\u2010printed carbon electrodes (SPCEs) containing tetrathiafulvalene (TTF) as mediator (TTF\/SPCEs). Isothermal titration calorimetry was used for investigation of kinetic properties of immobilized PUO. These PUO\/TTF\/SPCEs showed a linear response range from 10 a 74\u2005\u00b5M, a capability of detection of 10.1\u00b10.6\u2005\u00b5M (<jats:italic>n<\/jats:italic>=4, <jats:italic>\u03b1<\/jats:italic>=<jats:italic>\u03b2<\/jats:italic>=0.05) and a precision of 6.7\u2009%. Octopus and zucchini samples have been analysed using HPLC as a reference technique.<\/jats:p>","DOI":"10.1002\/elan.201400387","type":"journal-article","created":{"date-parts":[[2014,11,25]],"date-time":"2014-11-25T15:03:38Z","timestamp":1416927818000},"page":"368-377","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Characterization of a Disposable Electrochemical Biosensor Based on Putrescine Oxidase from <i>Micrococcus rubens<\/i> for the Determination of Putrescine"],"prefix":"10.1002","volume":"27","author":[{"given":"W.","family":"Henao\u2010Escobar","sequence":"first","affiliation":[]},{"given":"O.","family":"Dom\u00ednguez\u2010Renedo","sequence":"additional","affiliation":[]},{"given":"M. A.","family":"Alonso\u2010Lomillo","sequence":"additional","affiliation":[]},{"given":"J. F.","family":"Cascalheira","sequence":"additional","affiliation":[]},{"given":"A. 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