 IVES 9 IVES Conference Series 9 Macrowine 9 Macrowine 2021 9 Grapevine diversity and viticultural practices for sustainable grape growing 9 Chemical composition of cool-climate Sauvignon blanc grape skins clones during ripening

Chemical composition of cool-climate Sauvignon blanc grape skins clones during ripening

Abstract

AIM: Sauvignon blanc is the most important variety in cool valleys in central Chile accounting 15,522 ha which corresponds to 42.4% of the cultivated surface with white varieties in Chile (SAG, 2019). Casablanca Valley, one of the most important area for the production of white wines in Chile is located approximately to 35-40 km from the Pacific Ocean. Still, geographical area and the clone utilized could be decisive for the chemical and sensory characteristics of this type of wine (Duchene et al., 2009; Green et al., 2011), both during ripening and during ageing of wine. For this reason, the aim of this work is to study the concentration and composition of phenolic compounds and organic acids throughout ripening in grape skins of Sauvignon blanc clones grown in two zones of Casablanca Valley.

METHODS: Sauvignon blanc clones 242, 1 Davis and 107 grown in two zones of the Casablanca Valley, central zone of Chile were chosen. The grape berries were sampled every 15 days from veraison until commercial harvest, using a completely randomized design with five replicates in each selected vineyard. The following chemical analyses were assessed: titratable acidity, total soluble solids, total phenols, CIELab coordinates, low molecular weight phenolic profile and organic acids using High Performance Liquid Chromatography (HPLC-DAD).

RESULTS: As expected, titratable acidity diminished during ripening while total soluble solids and pH increased in all clones. Total phenols decreased in all clones during ripening, with significant differences in their concentration between the two geographical zones. Low molecular weight phenolic compounds showed differences in concentration between Sauvignon blanc clones and geographical origin showed that the grapes grown in the zone more closed to the Pacific Ocean had a higher concentration of flavonols, while organic acids differed in concentration but not in composition between clones and geographical origin.

CONCLUSIONS

We observed differences in concentration on some chemical parameters between Sauvignon blanc clones that depends on the geographical origin, while its composition remains similar.

DOI:

Publication date: September 2, 2021

Issue: Macrowine 2021

Type: Article

Authors

Alejandro Cáceres

Faculty of Agronomic and Food Sciences, Pontificia Universidad Católica de Valparaíso, Chile.,Pierina Peirano Faculty of Agronomic and Food Sciences, Pontificia Universidad Católica de Valparaíso, Chile.

Contact the author

Keywords

Sauvignon blanc, flavonols, organic acids, cool-climate wines

Citation

Energy partitioning and functionality of photosystem II in water-stressed grapevines during heatwaves revealed by continuous measurements of chlorophyll fluorescence

The increased intensity and frequency of heatwaves, coupled with prolonged periods of drought, are a significant threat to viticulture worldwide. During these conditions the more exposed leaves can show visible symptoms of heat damage. We monitored the functionality of photosystem II (PSII) in the field to better understand the impact of heatwaves on canopy performance. A factorial experiment was established in summer 2023 using Shiraz grapevines in the Barossa valley of South Australia, involving water-stressed and well-watered vines.

Mesoclimate and Topography influence on grape composition and yield in the AOC Priorat

The Priorat AOC, which is situated behind the coastal mountain range of Tarragona, is characterised by a Mediterranean climate that tends towards continentality and has very little precipitation during the vegetation cycle

Zoning of potential landscape and environment potential of the «Appellation d’Origine Contrôlée Costières de Nîmes»

The Union defence of the “appellation Costières de Nîmes” hired a reflection on the future of its territory production in the interests of preservation and enhancement.

Coming of age: do old vines actually produce berries with higher enological potential than young vines? A case study on the Riesling cultivar

Consumers and the wine industry tend to agree on the ability of old vines to produce fruit that allows the production of wine of superior character. However, despite past and ongoing research, objective evidence of this point of view is still debated and studies on robust, specifically dedicated plots are scarce. Thus the impact of grapevine age on berry oenological potential and wine quality remains an open question. To try to objectively address the issue, a unique vineyard was established at Geisenheim University, Germany. It was planted in 1971 with cv. Riesling grafted on 5C Teleki. In 1995 and 2012, several rows were uprooted and replanted with the same rootstock/scion combination, resulting in a vineyard with alternate rows of identical plant material, but with different planting dates. The parameters of technical maturity and grape composition at harvest were analyzed during seasons 2014, 2015, 2016 and 2017 combining HPLC and enzymatic methods. Separate micro-vinifications were made for each age group and wine composition was analyzed by a combination of 1H-NMR and SPE-GC-MS.

Red wine extract and resveratrol from grapevines could counteract AMD by inhibiting angiogenesis promoted by VEGF pathway in human retinal cells

Age-related macular degeneration (AMD) that is the main cause of visual impairment and blindness in Europe which is characterized by damages in the central part of the retina, the macula. This degenerative disease of the retina is mainly due to the molecular mechanism involving the production and secretion of vascular endothelial growth factor (VEF). Despite therapeutic advances thanks