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Two redox polymers\u2010poly(brilliant cresyl blue) (PBCB) and poly(Nile blue) (PNB), and two different architectures\u2010polymer\/Fe<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>\/GCE and Fe<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>\/polymer\/GCE were investigated. The electrochemical oxidation of epinephrine at the modified electrodes was performed by differential pulse voltammetry (DPV), in pH\u20057 electrolyte, and the analytical parameters were determined. The results show enhanced performance, more sensitive responses and lower detection limits at the modified electrodes, compared to other electrochemical epinephrine sensors reported in the literature. The best voltammetric response with the lowest detection limit was obtained for the determination of epinephrine at PBCB\/Fe<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>\/GCE. The novel sensors are reusable, with good reproducibility and stability, and were successfully applied to the determination of epinephrine in commercial injectable adrenaline samples.<\/jats:p>","DOI":"10.1002\/elan.201800816","type":"journal-article","created":{"date-parts":[[2019,1,17]],"date-time":"2019-01-17T13:20:32Z","timestamp":1547731232000},"page":"704-710","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":35,"title":["Polymer\/Iron Oxide Nanoparticle Modified Glassy Carbon Electrodes for the Enhanced Detection of Epinephrine"],"prefix":"10.1002","volume":"31","author":[{"given":"Luciana I. N.","family":"Tom\u00e9","sequence":"first","affiliation":[{"name":"Department of Chemistry Faculty of Sciences and Technology University of Coimbra  3004-535 Coimbra Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1972-4434","authenticated-orcid":false,"given":"Christopher M. 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