Effect of riboflavin on the longevity of white and rosé wines
Light is a fundamental part at sales points which influences in the conservation of wines, particularly in those that are sold in transparent glass bottles such as rosé wines and increasingly white wines. The photochemical effect known as “light-struck taste” can cause changes in the aromatic characteristics of the wine. This “light-struck taste” is due to reactions triggered by the photochemical sensitivity of riboflavin (RBF). Other causes of wine aroma deterioration during aging occurs during transport or storage. For example, temperature changes registered in this period can affect the sealing of the bottles with the consequent air inlet. These quality losses imply the need to know in depth the photochemical effect and compared it to other deterioration causes during bottle aging, such as oxygen or temperature. This knowledge is necessary to improve the longevity and quality of white and rosé wines.
This work studies the influence of riboflavin (RBF) level on the appearance of aromatic deviations (ADs) in white and rosé wines. Also, determine if this influence is modified by different stimuli (light, oxygen and temperature). For this, a white and a rosé wine at 3 levels of RBF were subjected to 7 different treatments (response to light in anoxia, response to oxygen in darkness, light+oxygen, light+oxygen at 35°C, accelerated reduction at 50°C in anoxia, thermal stability at 75°C in anoxia, control at 4°C in anoxia and darkness) with the aim of accelerating the aging of the wines and causing the appearance of DAs. A sorting task sensory test was carried out to group and describe the samples organoleptically. The quantification of volatile compounds in relation to the oxidation-reduction processes (volatile sulfur compounds1, polyfunctional mercaptans2 and Strecker aldehydes3) was also carried out in some selected samples. Several technological-sensory spaces different from the initial wine stored in anoxia, in the dark and at 4 °C have been detected. Different sensory changes were found depending on whether light hits the wine in the presence or absence of oxygen in both wines.
Acknowledgements: LAAE acknowledges the support of DGA (T29), European Social Fund and the CORK2WINE project of the CIEN-CDTI 2019 Strategic Program. M.B. thanks the AEI and the MICIU for her postdoctoral grant IJC2018-037830-I. This work has received a Research Grant from the IER of the Autonomous Community of La Rioja, in its 2022 call.
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aldehydes contained in wine. Assessment of their presence in table wines. Food Res. Int., 162: 112125, DOI 10.1016/j.foodres.2022.112125
Issue: ICGWS 2023
Laboratory for Aroma Analysis and Enology (LAAE), Department of Analytical Chemistry, Faculty of Sciences, Universidad de Zaragoza, Instituto Agroalimentario de Aragón-IA2 (Universidad de Zaragoza-CITA) Associate Unit to Instituto de las Ciencias de la Vid y del Vino (ICVV) (UR-CSIC-GR), 50009 Zaragoza, Spain
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riboflavin, white wine, rosé wine, light, aging, oxygen, temperature