1,721,017 research outputs found
A New Potentiometric Urea Biosensor Based on Urease Immobilized in Electrosyntesised Poly(o-Phenylenediamine)
No full textA potentiometric urea biosensor based on urease (Ur) electrochemical immobilisation by poly( o -phenylenediamine) (PPD) is proposed. Polymer films have been grown by cyclic voltammetry on a glassy carbon (GC) electrode, using an unconventional “upside-down” (UD) geometry. GC/Ur-PPD electrodes exhibit a rapid (5–10 s) and sensitive response to urea concentration and lifetime of at least 5 weeks. Work is in progress to optimise the sensor and study its behaviour in the presence of possible interferences
POTENTIOMETRIC UREA BIOSENSOR BASED ON UREASE IMMOBILIZED BY AN ELECTROSYNTHESIZED POLY(o-PHENYLENEDIAMINE) FILM WITH BUFFERING CAPABILITY
No full textA simple and novel potentiometric biosensor for urea detection was prepared by employing an electrosynthesized
polymer with buffering capability. It was obtained by deposition of a weighed amount
of urease (Ur) at a glassy carbon (GC) electrode followed by immobilization by an electrosynthesized
poly-o-phenylenediamine (PPD) film. An unconventional “upside-down” (UD) geometry was employed
for the electrochemical cell. The response of GC/Ur/PPD sensor is linear with urea concentration in the
range 10 microM to 1 mM (15 mV/mM, R2 = 0.9999) due to buffering capability of PPD film, which represents
a novel role of electrosynthesized polymers in their application to biosensors. At higher concentrations,
the more common Nernstian response (28 mV/decade, R2 = 0.9987) is observed. The sensor exhibits a
sufficient sensitivity for practical determinations, rapid response and long term stability
ELECTROCHEMICAL PREPARATION OF NOVEL POLYANILINE FILMS AS PROMISING MATERIALS IN MOLECULAR IMPRINTING
No full textDEVELOPMENT AND CHARACTERIZATION OF A NOVEL ANTIBACTERIAL MATERIAL BASED ON GOx IMMOBILIZED IN A PVA FILM
No full text
Development of a new glucose biosensor based on glucose oxidase entrapped in a poly(vinyl alcol) matrix
No full text
Caratterizzazione elettrochimica e spettroscopica di un sensore nanostrutturato per la determinazione amperometrica dell’acqua ossigenata
No full text
- …
