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Ricci, Francesco; Amine, Aziz; Tuta, Catalin S.; Ciucu, Anton A.; Lucarelli, Fausto; Palleschi, Giuseppe; Moscone, Danila
Analytica chimica acta, 05/2003, Letnik: 485, Številka: 1Journal Article
The addition to the carbon ink, a major component of a screen-printed electrode (SPE), of an aliquot (10%) of Prussian Blue (PB)-modified glassy carbon (PB-GC) particles, resulted in an interference free “ready to use” amperometric H 2O 2 sensor ( V app=−50 mV) with a LOD of 3×10 −7 mol/l and a sensitivity of 135 mA (mol l −1 cm 2). A storage stability of up to 8 months and an operational stability of 3 days has been achieved making these sensors suitable for mass-production. Glucose and lysine biosensors have been assembled immobilizing glucose oxidase (Gox) and lysine oxidase (LyOx) with glutaraldehyde and Nafion ® onto the PB bulk-modified electrodes. A LOD of 4×10 −6 mol/l for glucose and 5×10 −6 mol/l for lysine with a linear range up to 0.5 and 0.7 mmol/l, respectively, have been observed. A ready to use glucose biosensor was then developed mixing PB-modified glassy carbon (7.5%), carbon ink (87.5%) and glucose oxidase (GOx, 5%) and using the mixture for the printing step of a SPE working electrode. A LOD of 3×10 −5 mol/l and a linearity range up to 6×10 −3 mol/l of glucose have been achieved, together with a storage stability up to 20 weeks (at RT) and an operational stability of 1 day with 11 calibration curves performed.
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