 IVES 9 IVES Conference Series 9 Anthocyanins in tannat wines rapidly evolve toward unidentified red-coloured pigments

Anthocyanins in tannat wines rapidly evolve toward unidentified red-coloured pigments

Abstract

AIM: To assess the relationship between the reported low-stability of Tannat colour during wine storage and its pigment composition and evolution

METHODS: Twenty wines were elaborated under experimental conditions over two vintages, 2015 and 2016, eight corresponding to Tannat, and six to Syrah and Marselan. Wines were stored in darkness under cellar temperature conditions. Anthocyanins and tannins were quantified by spectrophotometric methods as well as by HPLC-DAD-ESI-MSn. Analysis were made three months after the end of winemaking, and twelve and twenty-four months later.

RESULTS: At three months, the pigment content determined by HPLC (spectrophotometer) ranged between 190-240 mg/L (370-665 mg/L) in Tannat, 200-320 mg/L (420-470) in Marselan and 100-305 (220-340) in Syrah. Colour intensity was between 17-28 AU in Tannat, 15-17 in Marselan and 10-16 in Syrah. From the second analytical date on, Tannat wines registered the lowest HPLC/spectrophotometer anthocyanin quotient, tendency increasing with wine age. Besides, Tannat wines presented much higher decreases of the HPLC anthocyanin content between analytical dates than the observed in Marselan and Syrah. This was independent from the type of pigment considered. Moreover, the unresolved HPLC broad peak was also of a higher relative magnitude in Tannat wines. This could not be explained by the tannin contents or pH measured in the wines. Spectrophotometric anthocyanin results did not show such differences among cultivars, neither in the proportion of SO2 bleachable pigments. Tannat wines showed as well the highest colour intensity decreases through time.

CONCLUSIONS

The result suggests that in Tannat wines, anthocyanins may evolve rapidly towards polymeric pigments that would still have red-bluish hues but would be less stable. These findings could be behind the low colour stability reported in literature for Tannat wines, and could be a starting point for future research.

DOI:

Publication date: September 14, 2021

Issue: Macrowine 2021

Type: Article

Authors

Guzmán Favre

Faculty of Agronomy, Universidad de la República, Av. Garzón 780. C.P., 12900 Montevideo, Uruguay ,Sergio, GÓMEZ-ALONSO, Regional Institute of Applied Scientific Research (IRICA), University of Castilla-La Mancha, Avda. Camilo José Cela S / N, 13071 Ciudad Real, Spain. José, PÉREZ-NAVARRO, Regional Institute of Applied Scientific Research (IRICA), University of Castilla-La Mancha, Avda. Camilo José Cela S / N, 13071 Ciudad Real, Spain. Diego, PICCARDO, Faculty of Agronomy, Universidad de la República, Av. Garzón 780. C.P., 12900 Montevideo, Uruguay Gustavo, GONZÁLEZ-NEVES, Faculty of Agronomy, Universidad de la República, Av. Garzón 780. C.P., 12900 Montevideo, Uruguay

Contact the author

Keywords

colour stability and evolution, derived pigments, tannat, syrah, marselan

Citation

Remote sensing applications in viticulture: recent advances and new opportunities

Remote sensing applications in viticulture have been a research theme now for nearly two decades, becoming a valuable tool for vineyard management. Metrics produced using remotely sensed images of vineyards have yielded relationships with grape quality and yield that can help optimise vineyard performance

Identification and evaluation of the winemaking sub-zones of the PDO Amyndeo winegrowing region

Context and purpose of the study. The concept of terroir encompasses the investigation of the physical environment’s influence on grapevine physiology, grape composition, and wine quality, with an emphasis on employing viticultural zoning techniques to systematically characterize and analyze terroirs.

The grapevine QTLome is ripe: QTL survey, databasing, and first applications

Overarching surveys of QTL (Quantitative Trait Loci) studies in both model plants and staple crops have facilitated the access to information and boosted the impact of existing data on plant improvement activities. Today, the grapevine community is ready to take up the challenge of making the wealth of QTL information F.A.I.R.. To ensure that all valuable published data can be used more effectively, the myriad of identified QTLs have to be captured, standardised and stored in a dedicated public database.
As an outcome of the GRAPEDIA initiative, QTL-dedicated experts from around the world have gathered to compile the grapevine QTLome: the complete information (e.g., map positions, associated phenotypes) describing all experimentally supported QTLs for a specific trait.

Valpolicella chemical pattern of aroma ‘terroir’ evolution during aging

Valpolicella is an Italian region famous for the production of high quality red wines. Wines produced in its different sub-regions are believed to be aromatically different, as confirmed by recent studies in our laboratory. Aging is a very common practice in Valpolicella and it is required by the appellation regulation for periods up to four years. The aim of this study was to investigate the evolution, during aging, of volatile chemical composition of Valpolicella wines obtained from grapes harvested in different sub-regions during different vintages.

The soil biodiversity as a support to environmental sustainability in vineyard

The environmental biodiversity is important to guarantee essential services to the living communities, its richness is a symptom of a minor disturbance and improves he environment biological quality.