Chemical and microbiological evaluation of Ribeiro wines (NW Spain)
Abstract
Wine produced under Designation of Origin (DOP) Ribeiro, the oldest DOP in Galicia (NW Spain), are elaborated using local grape cultivars, grown at the valleys of Miño, Avia and Arnoia rivers. The landscape formed by slopes and terraces and the peculiar climate of continental character, softened by the proximity of Atlantic Ocean, make it an area of excellent aptitude for vine cultivation. In addition, small-scale farming and the use of traditional techniques for vineyard management provide a great diversity to Ribeiro wines. This study presents the evaluation of red and white wines (bottled or bulk wines) from DOP Ribeiro, produced between years 2018-2022. Standard parameters of wine and the presence of biogenic amines were determined using OIV methodology. Residues of fungicides and insecticides were assessed by liquid chromatography tandem mass spectrometry (LC-MS/MS). Volatile aroma compounds were extracted by LLE and determined by GC-MS. Microbiological control of the wines by filtration allowed to detect the presence of microorganisms and their potential risk on wine spoilage. The results confirmed the diversity of Ribeiro wines and their chemical quality at both desirable properties and health concerning. Thus, volatile composition analysis allowed to observe differences among vintages and valleys. The average content of biogenic amines was 4.89 mg/L, and only 12% of the samples exceeded 10 mg/L. Residues of authorized pesticides were often detected in most of wines at concentrations above 10 mg Kg-1, but below the maximum residues limits (MRLs) defined by the EU in vinification grapes. In addition, all wines were analyzed by 1H NMR spectroscopy and a preliminary model of the DO. Ribeiro was built with the spectra of white wines.
Acknowledgements: Project AC2021E-02, Consellería do Medio Rural – Xunta de Galicia with funds from FEADER, MAPAMA and CCAA Galicia.
DOI:
Issue: ICGWS 2023
Type: Poster
Authors
1Estación de Viticultura e Enoloxía de Galicia (EVEGA-AGACAL), Ponte San Clodio s/n, 32428, Leiro-Ourense
2Instituto de Ciencias de la Vid y del Vino (CSIC, Universidad de La Rioja, Gobierno de La Rioja). Ctra. de Burgos, Km. 6. 26007 Logroño
3Estación Enológica de Haro, C\ Bretón de los Herreros, 4. 26200 Haro (La Rioja)
4Universidade de Santiago de Compostela (USC)-Instituto de Investigación en Análisis Químicos y Biológicos (IAQBUS), Constantino Candeira s/n, Campus Sur/Campus Vida, 15782 Santiago de Compostela
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Keywords
DOP Ribeiro wines, volatiles, residues, biogenic amines, microbiological control