OENO IVAS 2019 banner
IVES 9 IVES Conference Series 9 OENO IVAS 9 OENO IVAS 2019 9 Analytical tools using electromagnetic spectroscopy techniques (IR, fluorescence, Raman) 9 Monitoring small-scale alcoholic fermentations using a portable FTIR-ATR spectrometer and multivariate analysis

Monitoring small-scale alcoholic fermentations using a portable FTIR-ATR spectrometer and multivariate analysis

Abstract

Although some wine production processes still rely on post-production evaluation and off-site laboratory analysis, the new winemaking industry is aware of a need for a better knowledge of the process to improve the properties of the final product. Thus, more and more wineries are interested in incorporating quality-by-design (QbD) strategies instead of postproduction testing because of the possibility to early detect deviations in fermentation or any other wine process. This would allow to detect unwanted situations and eventually to ‘readjust’ the process, thus minimizing rejects. 

A strategy consisting on coupling FTIR-ATR spectroscopy and multivariate analysis is here proposed as a fermentation process control strategy. The idea was to develop a portable, rapid, easy-to-use and economic device/tool to monitor fermentation processes and to detect deviations from the normal fermentation conditions (NFC). A portable FTIR-ATR spectrometer was used to monitor small-scale alcoholic fermentations (microvinifications), some of them conducted in NFC and some others intentionally deviated from it. FTIR-ATR measurements were collected during the fermentation process and relative density and content of sugars (glucose and fructose), acetic acid, malic acid and lactic acid were analyzed by traditional methods. 

Multivariate analysis (exploratory methods and linear regression methods) was applied in order to model the whole fermentation process and detect deviations. The prediction of the sugar content in fermenting samples was achieved, demonstrating the possibility to use this portable device to rapidly monitor fermentations and to detect at an early stage slower fermentations, giving the possibility to the winemaker to eventually correct the process and to obtain a good quality product. Moreover, control charts based on multivariate Hotelling T2 and Q statistics were built to detect abnormal deviations. In conclusion, this methodology shows great potential as a fast and simple at-line analysis tool for early detection of fermentation problems. 

Acknowledgment:

The financial support by the Spanish Ministry of Science and Technology (Project AGL2015-70106-R) is acknowledged.

DOI:

Publication date: June 23, 2020

Issue: OENO IVAS 2019

Type: Article

Authors

Julieta Cavaglia, Barbara Giussani, Olga Busto, Laura Aceña, Joan Ferré, Montserrat Mestres, Ricard Boqué

Dipartimento di Scienza e Alta Tecnologia. Universitàdegli Studi dell’Insubria. Via Valleggio, 9. 22100 Como Italy 
Chemometrics, Qualimetrics and Nanosensors Group, Department of Analytical Chemistry and Organic Chemistry, Universitat Rovira i Virgili 43007 Tarragona Spain 

Contact the author

"> 

Keywords

rocess Control, Alcoholic Fermentation, FTIR, Portable device 

Tags

IVES Conference Series | OENO IVAS 2019

Citation

Related articles…

Application of high-throughput sequencing tools for characterisation of microbial communities during alcoholic fermentation

Developments in high-throughput sequencing (HTS) technologies allow us to obtain large amounts of microbial information from wine and must samples. Thus approaches, that are aimed at characterising the microbial diversity during fermentation, can be enhanced, or possibly even replaced, with HTS-based metabarcoding. To reduce experimental biases and increase data reproducibility, we compared 3 DNA extraction methods by evaluating differences in the fungal diversity with Riesling alcoholic fermentation samples at four different vineyards. The fungal diversity profiling was done using the genetic markers ITS2 and D2 using metabarcoding. The extraction methods compared consisted of a commercial kit, a recently published protocol that includes a DNA enhancer, and a protocol based on a buffer containing common inhibitor removal reagents. All methods were able to distinguish vineyard effects on the fungal diversity, but the results differed quantitatively.
Read More

Le Pinot noir dans la zone AOC des “Colli Orientali del Friuli” (nord-est de l’Italie) : influence de la forme de taille sur les paramètres viticoles et œnologiques du raisin et du vin

Pinot noir is an interesting vat variety for the high quality products it provides in the most suitable areas. In France, the most important Pinot Noir growing areas are Burgundy, Champagne, Alsace and the Loire. In Italy, Pinot Noir is grown almost exclusively in the northern regions of Trentino-Alto Adige, Lombardy and Friuli-Venezia Giulia.

Read More

The Shield4Grape project to improve the sustainability of European viticulture

Grapevine (vitis spp.) Is one of the major and most economically important fruit crops worldwide. Unlike other cropping systems, viticulture has ancient historical connections with the development of human culture and with the socio-cultural background of grape-growing areas. The vitis genus is characterised by high levels of genetic diversity, as result of natural genetic mutations, which are common in grapevines and further assisted by ongoing vegetative propagation.

Read More

Incidences of the climate, the soil and the harvest date on Colombard aromatic potential in Gascony

This experiment tries to characterize the role of soil, climate and harvest date on the composition of grape-derivated thiols, 3-mercapto-hexanol (3MH) and 3-mercapto-hexile acetate (A3MH), in the white wines from Colombard varieties in Gascony (South-West of France). A network of 6 plots has been observed since 1999 on different pedologic units. The plots have common agronomical characteristics, plantation spacing (2,900 to 3,500 vines per ha), plantation aging (1985-1990), strength conferred by rootstock (SO4, RSB), soil management (grass covered 1 by 2) and training system (vertical shoot positionning pruned in single Guyot). Meteorological stations are located near the plots.

Read More

Comparison of fortified, sfursat and passito winemaking techniques for the enhancement of the oenological potential of the black grape cultivar Moscato nero d’Acqui (Vitis vinifera L.)

One of the key factors of the economical development of viticulture and wine industry in specific limited areas is the exploitation of ancient, local grape varieties. Therefore, in recent years the growing interest to rediscover minor varieties, previously cultivated, has promoted many studies. With this regard, the focus of this study was the Vitis vinifera L. cultivar Moscato nero d’Acqui, nowadays found only in old vineyards in the Acqui zone (North-West Italy). In particular, the aims of this work were: i) to investigate secondary metabolites profile of the grapes, and ii) to evaluate the attitude to the production of special wines.

Read More