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• W2885273404 abstract "There is considerable interest in dexamethasone, a synthetic glucocorticosteroid drug, and a number of reports detailing the controlled release of dexamethasone from polypyrrole have been published. However, polypyrrole-doped with dexamethasone is poorly characterised. In this study, polypyrrole doped with dexamethasone was formed at relatively low applied potentials of 0.70 V or 0.80 V vs SCE by carrying out the electropolymerisation on an initial pre-layer of polypyrrole. These polymers displayed electroactive behaviour with a dexamethasone doping level of 0.30 ± 0.03 and using impedance measurements the charge-transfer resistance was computed as 400 Ω. Mixed ion transport was observed. In addition to the release of dexamethasone, hydrated sodium cations were incorporated to maintain charge neutrality on reduction of the polymer. Approximately 200 μg cm−2 of dexamethasone was released following 60 min on reduction of the polymer at −0.90 V vs SCE. It was possible to re-use the polymer to release the drug by repeated oxidation and reduction steps, where dexamethasone was incorporated during oxidation and released on reduction. During these events, sodium was accumulated within the polymer matrix and this high salt content accompanied with swelling and de-swelling events gave rise to the development of cracks in the polymer matrix." @default.
• W2885273404 created "2018-08-22" @default.
• W2885273404 creator A5062098315 @default.
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• W2885273404 date "2018-09-01" @default.
• W2885273404 modified "2023-10-16" @default.
• W2885273404 title "Formation of polypyrrole with dexamethasone as a dopant: Its cation and anion exchange properties" @default.
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• W2885273404 doi "https://doi.org/10.1016/j.jelechem.2018.07.052" @default.
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