Beverages (Apr 2023)

Different SO<sub>2</sub> Doses and the Impact on Amino Acid and Volatile Profiles of White Wines

  • Cátia V. Almeida Santos,
  • Catarina Pereira,
  • Nuno Martins,
  • Maria João Cabrita,
  • Marco Gomes da Silva

DOI
https://doi.org/10.3390/beverages9020033
Journal volume & issue
Vol. 9, no. 2
p. 33

Abstract

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SO2 is a preservative often used in the food industry, particularly in the wine industry. However, regulatory authorities and consumers have been strongly suggesting its reduction or even its replacement. In order to understand the impact of SO2 on the profiles of volatile organic compounds (VOCs) as well as amino acids (AAs), the aging of two white wines (one being a varietal and another being a blend) under identical conditions and in the presence of different doses of total SO2 was studied. After alcoholic fermentation (t = 0), either no SO2 was added (0 mg/L), or 30, 60, 90, or 120 mg/L of SO2 was applied. The samples under study were kept on fine lees for 3 months (t = 3). After 3 months (t = 6) and 9 months (t = 12), the wines were bottled and analyzed. For t = 0 and t = 3, the samples were submitted to HS-SPME-GC/MS for VOC analysis and LC-DAD for AA analysis. From the principal component analysis of the detected VOCs, it was observed that the blended wine in comparison with the varietal wine, was less impacted by the applied SO2 doses and aging time. From the AA profile, it was also observed in this study that maturation on fine lees resulted in an increase in the total concentration of AAs as would be expected.

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