Chemistry wine making

Dr. agronomist Biondi Bartolini, in collaboration with CDR srl and Parsec srl, has carried out an experimental project to verify whether certain chemical parameters, which characterize the polyphenolic content of a red wine, can be used to better manage the micro-oxygenation process. The experimental test was carried out in collaboration with the Marchesi Mazzei winery of Castellina in Chianti. To learn more about the project, the tests carried out and the results obtained download the article “Micro-oxygenation, an experiment to test the multiparametric approach and a decision support system”.

Obtaining the highest concentration of polyphenols in grapes is one of the main agronomic objectives that has a positive influence on the entire course of red wine making, giving the winemaker the possibility to obtain a wine of certainly higher quality. For this reason, it is important to identify the moment when the concentration of phenolic compounds in grapes is at its highest to start the harvest.

Are there methods to quickly and easily determine when grapes should be harvested in order to maximise the extraction of phenolic compounds?

Micro-oxygenation and maceration are two very important phases of winemaking that influence the stability and quality of the wine. Both processes are related to the content and characteristics of the polyphenols present in wine. Monitoring the evolution of these compounds over time is a fundamental tool in the hands of the winemaker to better manage winemaking processes and guarantee the quality of the finished product.

Download the article “Managing at best maceration and micro-oxygenation in the winemaking process” to find out which are the most effective methods to monitor the parameters that influence these processes and carry out the necessary operations to obtain both a stable and quality product.

Is setting up a quality control laboratory in the winery a determining factor for wine quality? What are the potential difficulties in carrying out quality control in the winery? What are the solutions for simple vinification control? For more information on this topic, download the article COMPLETE CONTROL OF VINIFICATION IN A SINGLE ANALYSIS INSTRUMENT.

As is known, due to global warming, we are witnessing increasingly adverse and difficult weather conditions. The rise in average temperatures is in fact causing an increase in the frequency of hot and dry vintages alternating with rainy and cool years. In difficult climatic conditions, in addition to the usual analysis of sugar, total acidity, pH and acetic acid, yeast assimilable nitrogen and gluconic acid are the fundamental parameters available to the oenologist to better manage the fermentative process, an essential starting point to obtain a quality wine. What are yeast assimilable nitrogen and gluconic acid? How can these analyses affect alcoholic fermentation? For further information on these important themes you can download the article: VINIFICATION IN THE ERA OF GLOBAL WARMING

A wine’s distinguishing features arise from the must it is made from. The latter’s analytical monitoring during the pre-fermentation phase is an essential requisite to obtain a high quality wine. Total acidity, pH, sugar content, volatile acidity are just some of the tests that allow an accurate analytical monitoring of wine must, both before and during the alcoholic fermentation phase. These analyses might not be sufficient to achieve a quality wine if the grapes have been harvested in specific weather conditions, namely hot and dry, or cool and rainy. In such years it is of paramount importance to quickly and easily assay further parameters such as gluconic acid, yeast assimilable nitrogen and malic acid. Let us see when.

One of the most important processes impacting biological and organoleptic stability in wine is the so-called malolactic or secondary fermentation. Through this process, the wine sheds acidity, grows smoother and acquires more complex, mature flavours. Here you will find some key points to fully understand and control malolactic fermentation.

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