Enoforum 2021
IVES 9 IVES Conference Series 9 Enoforum Web 9 Enoforum Web Conference 2021 9 Cellar session 9 All acids are equal, but some acids are more equal than others: (bio)acidification of wines

All acids are equal, but some acids are more equal than others: (bio)acidification of wines

Abstract

Insufficient acidity in grapes from warm(ing) climates is commonly corrected through addition of tartaric acid during vinification, and less so with other organic acids. One alternative approach involves bio-acidification with certain strains of Lachancea thermotolerans (LT) via lactic acid production during fermentation. Our previous work delivered a superior LT starter capable of lowering wine pH by ~0.5 units when used in co-cultures with Saccharomyces cerevisiae (SC).  Here, we aimed to i) compare the profiles of the bio-acidified LT wines and the acid-adjusted SC wines, and ii) evaluate the use of LT wines as blending components. For this purpose, high sugar/pH Merlot grapes (14.5 ° Bé; pH 3.9) were fermented with a sequential culture of LT and SC, and an SC monoculture control. The two obtained wines blended in three proportions (1:3, 1:1, 3:1), and the aliquots of the SC control (pH 4) were also acidified with either tartaric or lactic acid to the pH of the LT wine (pH 3.5).  Chemical analysis revealed major differences in a range of compositional parameters, which were reflected in the sensory profiles of wines, as confirmed via ‘Rate-All-That-Apply’ evaluation by wine experts (n=30). Sensory profiles of the bio-acidified LT wine and the lactic acid-adjusted SC wine were similar, and contrasting to the tartaric acid-adjusted SC wine. Despite the identical initial matrix, adjustment with lactic acid resulted in intenser ‘red fruit’ flavour, and lower ‘hotness’, ‘bitterness’ and ‘body’ relative to the adjustment with tartaric acid, driven by increases in ‘sourness’. The profiles of blends were modulated depending on the proportion of the bio-acidified wine, thus highlighting the potential of this approach to fine-tune ‘freshness’ and differentiate wine styles.

DOI:

Publication date: April 23, 2021

Issue: Enoforum 2021

Type: Article

Authors

Ana Hranilovic 1, 2; Marina Bely 1; Isabelle Masneuf-Pomarede 1,3; Warren Albertin 1,4, Vladimir Jiranek 2, 5

1 ISVV, University of Bordeaux, Villenave d’Ornon, France
2 Department of Wine and Food Science, The University of Adelaide, Adelaide, Australia
3 Bordeaux Sciences Agro, Gradignan, France
4 ENSCBP, Bordeaux INP, Pessac, France
5 The Australian Research Council Training Centre for Innovative Wine Production, Adelaide, Australia

Contact the author

Tags

Enoforum 2021 | IVES Conference Series

Citation

Related articles…

WHICH IMPACT FOR PROANTHOCYANIDIC TANNINS ON RED WINE FRUITY AROMA? SENSORY AND PHYSICOCHEMICAL APPROACHES

Previous research on the fruity character of red wines highlighted the role of esters. Literature provides evidence that, besides these esters, other compounds that are not necessarily volatiles may have an important impact on the overall aroma of wine, contributing to a modulation of its global aromatic expression. The goal of this work was to assess the olfactory consequences of a mixture between esters and proanthocyanidic tannins, through sensory and physico-chemical approaches.
Sensory analysis of numerous aromatic reconstitutions, including triangular tests, detection thresholds, and sensory profiles, were conducted in order to evaluate the sensory impact of tannins on red wine esters perception.

Read More

Stomatal restrictions to photosynthesis in grapevine cultivars grown in a semiarid environment

Diurnal changes in the leaves of field-grown grapevine (Vitis vinifera L.) cultivars Syrah and Tempranillo were followed over summer 2009 with respect to gas exchanges. Net photosynthetic rate (AN) of both cultivars rapidly increased in the morning, decreasing slowly until the late afternoon, when reached the lowest values.

Read More

Outline for the définition of “Terroirs Viticoles application to the area of El AIjarafe (Seville, Spain)

The grapes producing and wine making regions are différent in their use of agricultural, industrial or agroindustrial means. These means are quite often very original and/or specialised; and lately are also quite competitive. Such means are being defined with increased accuracy in the delimitation and definition of its characteristics (Paneque et al., 1996 a). Human action together with other Elements and Agents involved in the vine growing production (Reyner, 1989) over these means lead to agronomic systems with important characteristics. Finally, the transformation of the vine growing production, through different technologies (Fleet, 1992), results in the creation of products with a different acceptance and economical value in the market.

Read More

New genomic techniques for sustainable management of water stress and pathogen control

Context and purpose of the study. Climate changes pose the need to develop new grapevine varieties and rootstocks that are more tolerant to stress and diseases.

Read More

Preliminary results on the effect of different organic mulching on wine polyphenol content

Soil mulching is an interesting strategy to reduce soil evaporation, assist in weed control, improve soil structure and organic content, increase soil water infiltration, and decrease diurnal temperature fluctuations

Read More