The e-nose can be successfully used in grapefruit both in the storage industries and in the processing industries

In this work the aromatic pattern of grapefruit (Citrus paradisi) juices has been evaluated by an electronic nose (e-nose) device, developed at the University of Buenos Aires. The core of this device is an array of 11 nonspecific metal oxide semiconductor (MOS) sensors, capable of changing their electrical conductivity when exposed to the aroma. A non-supervised multivariate data analysis, the principal component analysis (PCA), was applied to data derived from sensor?s responses. The fresh hand-squeezed juices of three different grapefruit cultivars grown in Argentina have been analyzed (two white pulp grapefruit cultivars: ?Marsh Seedless? and ?Thompson?, and a pigmented pulp cultivar: ?Star Ruby?). The effect of the storage time on the aroma has been also taken into account by storing the fruits at room temperature for 10 days. The results show the capability of the e-nose to distinguish the aroma of juices of different grapefruit cultivars and, also, to detect the differences of juice aroma extracted from fruits stored for many days. The characteristics of grapefruit juice as flavor and smell are extremely important in conferring value to the product. It is possible to conclude that the e-nose can be successfully used both in the storage industries to monitor the fruits shelf-life and in the processing industries to control the product quality. Original title, full list of authors and sources:Discrimination of three Citrus paradisi cultivars by electronic nose.Guarrasi V.1, Bernik D.2, Bulone D.3, San Biagio P. L.3, German? M. A.1, and Negri R. M.21Dip. DEMETRA, Universit? degli Studi di Palermo, Facolt? di Agraria, Viale delle Scienze 11, 90128, Palermo, Italy; 2Departamento de Qu??mica Inorg?nica, Anal??tica y Qu??mica F??sica, Facultad de Ciencias Exactas y Naturales, Instituto de Qu??mica F??sica de Materiales, Ambiente y Energ??a, Universidad de Buenos Aires, Ciudad Universitaria (INQUIMAE), Buenos Aires, Argentina; and 3Istituto di BioFisica, Consiglio Nazionale delle Ricerche, Via La Malfa 153, 90146, Palermo, Italy. valeria.guarrasi@pa.ibf.cnr.it XII International Citrus Congress, Valencia, Spain, 18-23 noviembre 2013. The picture is by conversasdecafe-flor.blogspot.com? ?