Caffeine is a natural alkaloid exerting many physiological effects, widely distributed in plant products and beverages and its quantification is mainly of pharmaceutical and alimentary concern. Quantitative methods are generally more expensive, time-consuming and complicated than electroanalytical ones but the electrochemical determination of caffeine is not so suitable because of its high oxidation potential at the most common electrode materials. A method based on the modification of a gold electrode (Au) surface by deposition of functionalized gold nanoparticles is described. The best performances were observed at Au electrode modified with colloidal gold nanoparticles (AuNPs) stabilized into a chitosan matrix Analytical parameters such as reproducibility, interference rejection, response time, storage and operational stability of the caffeine sensor have been investigated.
Determination of caffeine @ gold nanoparticles modified gold (Au) electrode: a preliminary study / Curulli, A.; Trani, A.; Di Carlo, G.; Zane, D.; Petrucci, R.; Marrosu, G.. - STAMPA. - (2013), p. P 65. (Intervento presentato al convegno XXIV Congresso della Divisione di Chimica Analitica della Società Chimica Italiana (SCI) tenutosi a Sestri Levante (GE), Italy nel 15-19 September, 2013).
Determination of caffeine @ gold nanoparticles modified gold (Au) electrode: a preliminary study
Petrucci, R.;Marrosu, G.
2013
Abstract
Caffeine is a natural alkaloid exerting many physiological effects, widely distributed in plant products and beverages and its quantification is mainly of pharmaceutical and alimentary concern. Quantitative methods are generally more expensive, time-consuming and complicated than electroanalytical ones but the electrochemical determination of caffeine is not so suitable because of its high oxidation potential at the most common electrode materials. A method based on the modification of a gold electrode (Au) surface by deposition of functionalized gold nanoparticles is described. The best performances were observed at Au electrode modified with colloidal gold nanoparticles (AuNPs) stabilized into a chitosan matrix Analytical parameters such as reproducibility, interference rejection, response time, storage and operational stability of the caffeine sensor have been investigated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
