Titolo:  Exploiting combined absorption and front face fluorescence spectroscopy to chase classification: A proof of concept in the case of Sardinian red wines
Data di pubblicazione:  2019
Data di prima pubblicazione on-line:  2019
Autori:  Carbonaro, Carlo Maria; Corpino, Riccardo; Chiriu, Daniele; Ricci, Pier Carlo; Rivano, Silvio; Salis, Marcello; Tuberoso, Carlo Ignazio Giovanni
Numero degli autori:  7
Lingua:  Inglese
Presenza coautori internazionali:  no
Volume:  214
Pagina iniziale:  378
Pagina finale:  383
Numero di pagine:  6
Digital Object Identifier (DOI):  http://dx.doi.org/10.1016/j.saa.2019.02.041
Codice identificativo Pubmed:  30802794
Codice identificativo Scopus:  2-s2.0-85061746129
Codice identificativo ISI:  WOS:000471315400049
URL:  https://www.sciencedirect.com/science/article/pii/S1386142519301593
Abstract:  We present the analysis of optical spectroscopy fingerprints of three different varieties of Sardinian red wine, Carignano, Cannonau and Monica, belonging to Italian DOC (Controlled Origin Designation) red wines family. We selected 15 commercial wines (five for each variety), produced in the middle and south regions of Sardinia form monovarietal grapes. Despite different grapes, farming and tasting, all the samples share common absorption and fluorescence features. A two steps analysis is applied to achieve good classification of the wines. We recorded typical absorbance spectra with a large absorption below 300 nm and a visible absorption band at about 520 nm. Colour attributes according to chromaticity coordinates were evaluated by means of transmittance data and coupled to wine aging data to achieve classification. Despite similar values of lightness (L*), chroma (C* ab ), and hue angle (h° ab ) for the three varieties, good clustering was gathered for Carignano and Cannonau wines, whilst Monica variety has wide spread chromatic coordinates. UV excited fluorescence spectra display large and composite emission bands from the near UV down to the whole visible range. We performed multivariate analysis in the framework of the principal component analysis of fluorescence spectra coupled with absorption ones being able to achieve good clustering between the three varieties. One anomaly among Cannonau wines is discussed.
Parole chiave:  Absorption spectroscopy; Luminescence spectroscopy; Multivariate analysis; Analytical Chemistry; Atomic and Molecular Physics, and Optics; Instrumentation; Spectroscopy
Tipologia: 1.1 Articolo in rivista

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