Characterizing and Authenticating Montilla-Moriles PDO Vinegars Using Near Infrared Reflectance Spectroscopy (NIRS) Technology
Autor
De la Haba, María-José
Arias, Mar
Ramírez, Pilar
Sánchez, María-Teresa
López, María Isabel
Editor
MDPIFecha
2014Materia
NIR spectroscopyWine vinegar
Quality parameters
Authentication
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This study assessed the potential of near infrared (NIR) spectroscopy as a
non-destructive method for characterizing Protected Designation of Origin (PDO) “Vinagres
de Montilla-Moriles” wine vinegars and for classifying them as a function of the
manufacturing process used. Three spectrophotometers were evaluated for this purpose: two
monochromator instruments (Foss NIRSystems 6500 SY-I and Foss NIRSystems 6500 SY-II;
spectral range 400–2,500 nm in both cases) and a diode-array instrument (Corona
45 VIS/NIR; spectral range 380–1,700 nm). A total of 70 samples were used to predict major
chemical quality parameters (total acidity, fixed acidity, volatile acidity, pH, dry extract, ash,
acetoin, methanol, total polyphenols, color (tonality and intensity), and alcohol content), and
to construct models for the classification of vinegars as a function of the manufacturing
method used. The results obtained indicate that this non-invasive technology can be used
successfully by the vinegar industry and by PDO regulators for the routine analysis of
vinegars in order to authenticate them and to detect potential fraud. Slightly better results
were achieved with the two monochromator instruments. The findings also highlight the potential of these NIR instruments for predicting the manufacturing process used, this being
of particular value for the industrial authentication of traditional wine vinegars.