Fac-simile Scheda Linee di Ricerca - Federalimentare

Dati pubblicati inerenti il tema di ricerca:1. Rocchia M., Rossi A.M., Zeppa G. (2006) Determination of ethanol content in wine through aporous silicon oxide microcavity. Sensors & Actuators B, 123, 89-93.This paper reports on a new sensor, based on a porous silicon oxide microcavity, for the determination of the alcoholicstrength of white and red wines. The shift of the cavity mode due to interaction with ethanol is monitoredin continuous way by means of Fourier transform infrared (FT-IR) spectroscopy comparing the data obtained incondensation and evaporation mode. The results demonstrate the advantage of working in evaporation mode andthe possibility to determine the alcoholic strength of wine with a good reproducibility and selectivity.2. Rocchia M., Ellena M., Zeppa G. (2007) Determination of Ethyl Alcohol content in red wineswith an optical alcoholmeter based on a nanostructured silicio. J. Agric. Food Chem., 55 (15):5984-5989.A rapid analytical method for selectively monitoring ethyl alcohol in red wines without sample pre-treatment,based on the use of an optical sensor, has been developed exploiting a porous silicon microcavity. The opticalstructure, realized by alternating layers of different porosities, was stabilized by thermal oxidation, and the resonantpeak shift of the microcavity (projected at 600 nm) was monitored in the presence of more than 20 redwines. The resonant peak shows an increasing red shift depending on the wine alcoholic strength, which is ascribableto a change of refractive index due to physisorption/condensation of ethanol vapours inside the pores’structure. The linear response of the PS oxidized microcavity to the wine alcoholic strength insures the determinationof the ethanol amount with a high accuracy and reliability. The calculated values differ by less than 0.5%to those obtained with the official method in accordance with the limits imposed by European laws. Moreover, auser-friendly interface, allowing the sensor to be used by unskilled persons, and portable packaging, able to ensurein situ measurements, have been developed.3. Rocchia M., Rossi A.M., Zeppa G., De Stefano L. (2006) Apparato per la determinazione delcontenuto di etanolo in sostanze liquide o aeriformi e relativo procedimento. Brevetto:TO2006A000213.SISTAL - SOCIETA’ ITALIANA DI SCIENZE E TECNOLOGIE ALIMENTARIDipartimento di Scienze e Tecnologie Agroalimentari, Università degli Studi della TusciaVia San Camillo de Lellis, 01100 ViterboTel.: 0761- 35 74 94/7 , Fax: 0761- 35 74 98, e-mail: mmoresi@unitus.it465