terclim by ICS banner
IVES 9 IVES Conference Series 9 International Congress on Grapevine and Wine Sciences 9 2ICGWS-2023 9 Phenolic extraction and dissolved oxygen concentration during red wines fermentations with Airmixig M.I.™

Phenolic extraction and dissolved oxygen concentration during red wines fermentations with Airmixig M.I.™

Abstract

During red wine fermentation, the extraction of phenolics compounds and sufficient oxygen provision are critical for wine quality [1,2]. In this trial, we aimed at evaluating the kinetics of phenolic extraction and dissolved oxygen during red wine fermentations using the airmixing system. Twenty lots of red grape musts were fermented in 300.000 L tanks, equipped with airmixing, using two injection regimes (i.e., high and low intensity, and high and low daily frequency). An oxygen analyzer was introduced into the tanks in order to record the concentration of dissolved oxygen over time. Additionally, juice/wine samples were taken at days 0, 2, 4, and 6 as to evaluate their chemical composition with an emphasis on phenolics. Our results showed clear differences in dissolved oxygen depending on the aeration regime employed. Like so, phenolic composition varied between samples, but less differences were observed among aerations regimes. The highest intensity and frequency of air injections produced the highest peaks of oxygen dilution, but not the highest increase in total phenolics, anthocyanins, short polymeric pigments, and tannin concentration. Differences in phenolic compounds among treatments were mostly mediated by temperature changes during fermentation. However, these variations tend to equilibrate by the end of the fermentation. Based on these results, more research is being conducted to keep characterizing the extraction kinetics, color, and phenolic evolution of red wines fermented with air injections.

Acknowledgements: Thanks to ANID-Fondecyt grants 1190301 and 1231484 for financing this study, and to Viña Santa Carolina for allowing us to work at their winery. PPM also thanks ANID for her doctoral scholarship, “Beca de doctorado nacional”.

References:

1)  Day MP. et al. (2021) Aeration of Vitis vinifera Shiraz fermentation and its effect on wine chemical composition and sensory attributes. Aust. J. Grape Wine Res., 27: 360-377, DOI 10.1111/ajgw.12490

2)  Gambuti A. et al. (2018) Evolution of Sangiovese wines with varied tannin and anthocyanin ratios during oxidative aging. Front. Chem., 6 (march): 1-11, DOI 10.3389/fchem.2018.00063

DOI:

Publication date: October 13, 2023

Issue: ICGWS 2023

Type: Poster

Authors

V. Felipe Laurie1*, Paula A. Peña-Martínez1

1Facultad de Ciencias Agrarias, Universidad de Talca, Chile. Av. Lircay s/n, Talca, Chile. 346000

Contact the author*

Keywords

red wine fermentation, airmixing, air, dissolved oxygen, phenolic compounds

Tags

2ICGWS | ICGWS | ICGWS 2023 | IVES Conference Series

Citation

Related articles…

Reduction of the height of the canopy in fruit set and in pea size: vegetative, productive and maturation effects, in cv. Verdejo

Global warming is accelerating the technological ripening of the grape, with a loss of acidity, which requires that vineyard management can delay ripening to avoid it. The source-sink relation is essential for grape ripening, since it affects the distribution of photosynthates and substances derived from plant metabolism. A work is proposed to know the response of the vineyard to the drastic reduction of the foliar surface by trim down the shoots in cv.

Read More

Conventional and alternative pest management strategies: a comparative proteomic study on musts

In a context of sustainable agriculture, “agroecological immunity” is an emerging concept to reduce the use of chemical pesticides to protect crops against pathogens. This alternative strategy aims to combine different levers including the use of “bio”solutions. These include biocontrol products, some of which being plant defense elicitors, as well as products authorized in organic farming such as copper or sulfur. In vineyards, depending on climate conditions, powdery and downy mildews can be devastating diseases.

Read More

Development and validation of a free solvent UHPLC/MS-MS method to analyse melatonin and its precursors in Spanish commercial wines  

Melatonin is a bioactive compound present in foods and beverages such as wines. During alcoholic fermentation, yeast transforms tryptophan into certain indole compounds, including melatonin. This paper aims to develop and validate a free solvent analytical method by ultra-high performance liquid chromatography coupled with high resolution mass spectrometry (UHPLC/MS-MS) to determine melatonin and its precursors (L-tryptophan, tryptamine, serotonin, tryptophol, N-acetylserotonin, 5-hydroxytryptophan, and 3- indoleacetic) that appropriately prevent the matrix effect.

Read More

Antimicrobial activity of oenological polyphenols against Gram positive and Gram negative intestinal multidrug-resistant bacteria

Bacterial antibiotic resistance is a major current health problem. Polyphenols have demonstrated antibacterial activity, and in this work we studied the effect of oenological polyphenols on the growth of intestinal multidrug-resistant strains of human and animal origin. Two Enterococcus faecium strains, resistant to vancomycin and other antibiotics, and four Escherichia coli strains, resistant to ampicillin and other antibiotics, were included in this study. All strains showed multidrug resistant phenotypes and genotypes to at least two antibiotic families.

Read More

Unveiling a hidden link: does time hold the key to altered spectral signatures of grapevines under drought?

Remote sensing technology captures spectral data beyond the visible range, making it useful for monitoring plant stress. Vis-NIR (Visible-Near Infrared) spectroscopy (400-1000 nm) is commonly used to indirectly assess plant status during drought. One example is the widespread use of normalized difference vegetation index (NDVI) that is strongly linked to green biomass. However, a knowledge gap exists regarding the applicability of this method to all the drought conditions and if it is a direct correlation to the water status of the plant.

Read More