OENO IVAS 2019 banner
IVES 9 IVES Conference Series 9 Red wine astringency: evolution of tribological parameters during different harvest dates

Red wine astringency: evolution of tribological parameters during different harvest dates


Astringency is a specific oral sensation dominated by dryness and puckering feeling and is one of the leading quality factors for red wines, as well as some fruit products. Based on this sensory parameter, are made relevant decisions in wine production including the moment of grape harvest (phenolic ripeness), the time and intensity of maceration, the time and type of aging process, and the target market of wines. Notably, the selection of the optimal grape astringency during ripeness is one of the most crucial decisions in winemaking. However, grape astringency is an attribute challenging to evaluate and standardize by tasters since the grapes are heterogeneous and generate along their ripeness different sensory descriptors, such as the typical drying astringency found in immature grapes. Here we used a tribological system to determinate the red wine astringency produced on different harvest dates. Mixtures of whole human saliva and red wines as Cabernet Sauvignon and Carménère, with similar tannin content but different sub-quality (rough and soft/velvety, respectively), were evaluated by their lubrication behavior. Red wines produced significant changes in the saliva friction coefficient during the harvest dates, with an opposite evolution between the Cabernet Sauvignon and Carménère. Also, microstructure observation revealed differences between conformation and surface of the tan-ninprotein aggregates of both red wines, suggesting a correlation between them and the astringency sensory perception. Results from this work demonstrate that tribology techniques can be a useful tool for both to evaluate astringency on red wines and to help us to understand the phenomenon of sub-qualities.


Publication date: June 19, 2020

Issue: OENO IVAS 2019

Type: Article


Natalia Brossard, Giuseppina Parpinello, Fernando Osorio, Edmundo Bordeu, Jianshe Chen

Department of Food Sciences, University of Bologna, P.za Goidanich 60, I-47023 Cesena, Italy.
Department of Food Science and Technology, University of Santiago Chile, Avda. Libertador Bernardo O’Higgins 3363, San-tiago, 9170022, Chile.
Department of Fruit Trees and Enology, Pontifical Catholic University of Chile, Avda. Vicuña Mackenna 4860, Santiago, 7820436, Chile.
School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310018, P. R. China.

Contact the author


wine astringency, tribology, human saliva, harvest dates 


IVES Conference Series | OENO IVAS 2019


Related articles…

Physiological and growth reaction of Shiraz/101-14 Mgt to row orientation and soil water status

Advanced knowledge on grapevine row orientation is required to improve establishment, management and outcomes of vineyards on terroirs with different environmental conditions (climate, soil, topography) and in view of a future change to more extreme climatic conditions. The purpose of this study was to determine the combined effect of row orientation, plant water status and ripeness level on the physiological and viticultural reaction of Shiraz/101-14 Mgt.

Effects of mechanical leafing and deficit irrigation on Cabernet Sauvignon grown in warm climate of California

San Joaquin Valley accounts for 40% of wine grape acreage and produces 70% of wine grape in California. Fruit quality is one of most important factors which impact the economical sustainability of farming wine grapes in this region. Due to the recent drought and expected labor cost increase, the wine industry is thrilled to understand how to improve fruit quality while maintaining the yield with less water and labor input. The present study aims to study the interactive effects of mechanical leafing and deficit irrigation on yield and berry compositions of Cabernet Sauvignon grown in warm climate of California.

The effects of cane girdling on berry texture properties and the concentration of some aroma compounds in three table grape cultivars

The marketability of the table grapes is highly influenced by the consumer demand; therefore the market value of the table grapes is mainly characterized by its berry size, colour, taste and texture. Girdling could cause accumulation of several components in plants above the ringing of the phloem including clusters and resulting improved maturity. The aim of the experiments was to examine the effect of girdling on berry texture characteristics and aroma concentration.

Application of a fluorescence-based method to evaluate the ripening process and quality of Pinot Blanc grape

The chemical composition of grape berries at harvest is one of the most important factors that should be considered to produce high quality wines. Among the different chemical classes which characterize the grape juice, the polyphenolic compound, such as flavonoids, contribute to the final taste and color of wines. Recently, an innovative non-destructive method, based on chlorophyll fluorescence, was developed to estimate the phenolic maturity of red grape varieties through the evaluation of anthocyanins accumulated in the berry skin. To date, only few data are available about the application of this method on white grape varieties.

Different yield regulation strategies in semi-minimal-pruned hedge (SMPH) and impact on bunch architecture

Yields in the novel viticulture training system Semi-Minimal-Pruned Hedge (SMPH) are generally higher compared to the traditional Vertical Shoot Positioning (VSP). Excessive yields have a negative impact on the vine and wine quality, which can result in substantial losses in yield in subsequent vintages (alternate bearing) or penalties in fruit quality. Therefore yield regulation is essential. The bunch architecture in SMPH differs from VSP. Generally there is a higher amount but smaller bunches with lower single berry weights in SMPH compared to VSP.