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07/09/2026

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07/09/2026

© 2026 - SORMARI AGRICULTURE LTD
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What are Wine Yeasts?
Wine yeasts are single-celled microorganisms belonging to the fungi kingdom, which are essential in winemaking. During alcoholic fermentation, wine yeasts convert the sugars present in the must into ethyl alcohol and carbon dioxide, also producing a series of volatile and non-volatile compounds that give grapes and wine their characteristic aroma.
Wine yeasts are naturally found on grape skins and in the surrounding environment, but are often not present in sufficient quantity and quality to ensure complete and stable fermentation. For this reason, almost all winemakers use selected yeasts, cultivated and bred specifically for winemaking.
There are several species of wine yeast, including Saccharomyces cerevisiae, Saccharomyces bayanus, and Candida stellata, each with specific fermentation characteristics and volatile compound production. Choosing the right yeast depends on the type of grape and the style of wine you want to produce.
What Are Yeasts Used For in Wine?
Yeasts are essential in winemaking because they are responsible for alcoholic fermentation, the process by which the sugars present in grapes are converted into ethyl alcohol and carbon dioxide, also producing a series of volatile compounds that give grapes and wine their characteristic aroma.
During alcoholic fermentation, yeasts consume the sugars present in the must and produce alcohol, carbon dioxide, and a series of volatile compounds that influence the taste, aroma, and structure of the wine. Furthermore, wine yeasts can also influence the stability of the wine, as proper fermentation allows for a reduction in the use of sulfites and other preservatives.
Choosing the right yeasts and managing fermentation are therefore crucial to obtaining a high-quality and long-stable product. Many winemakers use selected yeasts, cultivated and bred specifically for winemaking, to control fermentation and achieve the desired flavor, aroma, and structure.
Advantages of Using Yeast for Wine Fermentation
The main advantages of using yeast to better manage fermentation and obtain the best possible quality from the final product are:
* Fermentation control: The use of selected yeasts and activators allows you to control the fermentation of the must, avoiding unwanted fermentations and maintaining control over the speed and duration of fermentation. This prevents the production of unpleasant aromas and flavors and ensures greater wine stability.
* Greater fermentation efficiency: Yeasts and activators improve fermentation efficiency, allowing for a greater conversion of sugars into alcohol and a greater production of volatile compounds, which contribute to the aroma and flavor of the wine. They also make stuck fermentations difficult.
* Reduction of contamination risks: The use of selected yeasts and activators can help reduce the risk of bacterial and fungal contamination, which can compromise the quality and shelf life of the wine. Selected yeasts compete with other bacterial and fungal species present on the grapes, preventing the proliferation of unwanted organisms.
* Improved stability: The use of selected yeasts and activators can improve wine stability, both during fermentation and during long-term storage. This results in greater resistance to oxidizing agents and a greater ability to preserve aromas and flavors over time.

05/09/2026

05/09/2026

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How is white wine made? White winemaking is the process of producing white wines through the fermentation of grape juice alone, without the skins and seeds.
White wine can also be made from red grapes, as long as the solids of the bunch do not come into contact with the juice.
White Winemaking – Grape Processing
The first step in white winemaking involves destemming and pressing the grapes harvested during the harvest. The grapes are separated from the stems and gently pressed to extract part of the juice, called free-run must.
After destemming, the crushed grapes are gently pressed and the juice is immediately separated from the skins and seeds (draining).
The must obtained from pressing is usually cloudy and may contain small residues of suspended solids. Before fermentation, the wine can be "cleaned" by filtration, decantation, or with the aid of enzymes or oenological clarifying agents (clarification).
White Winemaking – Alcoholic Fermentation
The second step in white winemaking is alcoholic fermentation: during this process, yeasts transform the must into white wine.
The alcoholic fermentation of white wines occurs without the presence of skins and seeds. Yeasts, naturally present or added, convert grape sugars (glucose and fructose) into ethyl alcohol and carbon dioxide. Secondary compounds (such as fermentative aromas and glycerol) are also produced, which influence the wine's body and its sensory profile.
This process typically lasts 5 to 12 days and occurs at a controlled temperature (17-20°C, lower than red winemaking) to stimulate the production of fine and elegant aromas.
In white winemaking, the must usually ferments in stainless steel tanks. Once fermentation is complete, the wine is separated from the coarser lees (impurities consisting primarily of plant residues and tartaric acid precipitations) and racked.
Alcoholic fermentation in white winemaking can also take place in wooden barrels or barriques. In this case, at the end of fermentation, the wine is not racked but rather aged for several months in the same container on the fine lees (sur lies aging).
The fine lees, composed of yeasts that have reached the end of their life cycle, stabilize the white wine and make it smoother and rounder.
White Winemaking – Maturation and Bottling
The third step in white winemaking involves the maturation of the wine. During maturation, the components of white wine harmonize and the entire organoleptic profile evolves, gaining complexity.
White wine, as we saw above, can mature in wood: barriques (usually oak) are used for the maturation of full-bodied, alcoholic, and well-structured white wines. White wines aged in wood are recognizable by their intense golden color, honeyed and sweet spicy aromas, and long finish on the palate.
Following white winemaking, white wines are aged in stainless steel tanks, an inert material that does not alter the wine's organoleptic profile and preserves its varietal character and fresh aromas.
After being clarified, stabilized, and filtered if necessary, the white wine is ready for bottling.
White winemaking, like rosé winemaking, produces wines with a shorter shelf life than red wines due to their lower alcohol content and lower concentration of polyphenols (compounds present in the skins and seeds, which are antioxidants and stabilizers).
White wines are therefore not usually intended for bottle aging but are meant to be consumed within two to three years of harvest. However, there are numerous exceptions. There are grape varieties (usually characterized by old vines, low yields, and mineral-rich soil) that produce white wines suitable for aging that can be aged in bottle for decades.

03/09/2026

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When should wine be pressed?
After racking, the solids are pressed to recover the remaining wine in contact with the skins, and the entire liquid mass is stored in barrels, barriques, stainless steel containers, or other winemaking vessels for the maturation and aging phase.
How long does it take for wine to ferment?
It takes 24 hours for the wine to boil; this can vary, if it's made from red grapes, from 4 to 5 days. During these days, punching down is performed (which involves breaking the cap with a stick, allowing the skins to release their substances and colorants into the must).
How many days should the must be left in the vat?
When the alcoholic fermentation visibly slows down, the solids begin to settle to the bottom, and it's time to proceed with racking.
When is the must racked?
Racking should be done when most of the sugar in the must has converted to alcohol. Wine is a living substance; it's constantly changing, and these changes must be monitored closely. When its "activity" decreases and the solids begin to settle to the bottom, it's time to rack.
When is the must removed from the pomace?
A temperature of 20°C at the time of inoculation is optimal for yeast growth; a temperature of 26°-28°C is ideal for fermentation and extraction of the pomace's constituents.

02/09/2026

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01/09/2026

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HOW RED WINE MAKING IS PROCESSED?
The biochemical process of transforming grapes into wine, winemaking differs depending on whether you want to make white or red wine.
Specifically, red winemaking (or maceration winemaking) involves bringing the pomace into contact with the fermenting must: the solid parts of the grape, including its skin and seeds, are brought into contact with the liquid fraction during fermentation so that part of their substances can be extracted.
What distinguishes it from white winemaking is the simultaneous fermentation and maceration.
Alcoholic Fermentation of Grapes
It all begins with the harvest, and therefore with picking the grapes when they are ripe: their sugar content is at its highest, their acidity is at its lowest, and any herbaceous aromas have disappeared. To obtain a good red wine, it is essential to harvest the grapes at the right phenolic and technological ripeness, verifying these parameters through a sensory analysis of the skin, pulp, and seeds.
Equally crucial is removing damaged grapes before proceeding with the subsequent steps: destemming to separate the grapes from the stalks (which would give the wine a bitter taste and contain a lot of water) and pressing. This last preparatory step releases the liquid from the grapes, facilitating fermentation and maceration.
The fermentation of red wine, typically carried out in steel tanks, serves to transform the glucose and fructose contained in the must into ethanol, carbon dioxide, heat, and other byproducts through the action of yeasts. Some wineries choose not to add yeasts, instead letting the indigenous yeasts naturally present on the grapes and in the cellar "guide" the fermentation; others add Active Dry Yeast preparations that limit the risk of organoleptic and flavor deviations.
AT WHAT TEMPERATURE SHOULD RED WINE FERMENT?
The ideal temperature for fermenting red wine is 27-30°C: modern equipment helps maintain a constant temperature, thus promoting the production of quality wine.
During fermentation, the effect is that of a boiling mass due to the high production of CO2: the solid part of the must, including the grape seeds and skins, is pushed to the surface by the carbon dioxide and floats there, forming the so-called "floating cap." During fermentation, the cap is repeatedly punched down and then pumped over to dissolve the polyphenols, prevent the pomace from acetifying, and promote yeast colonization. This process can be performed by hand in the ancient manner or delegated to the machinery many wineries have (fermenters or fermenters).
GRAPE MACERATION
Red winemaking is also known as maceration winemaking.
Maceration involves keeping the pomace in contact with the must to facilitate the extraction of the substances contained in the grape skin and pulp.
The duration of maceration depends on the wine you intend to produce: 4-7 days for fresh, fruity wines to be drunk young, 15-20 days for wines rich in tannins intended for long aging. Anthocyanins, in fact, reach their maximum release after 2-5 days. Tannin release, on the other hand, is progressive, slowing after 10-20 days.
Various maceration techniques can be used. Cold pre-fermentation maceration, aimed at producing colorful, fruity wines, involves adding dry ice to the tank containing the crushed grapes for 5-10 days, until the temperature drops to 5°C.
The final hot maceration, on the other hand, is performed at the end of fermentation, providing a burst of heat to the pomace in contact with the wine, resulting in fuller-bodied wines.
DRAWING OF THE GRAPES
At the end of red wine fermentation, the skins and pips are separated from the must. This operation is called racking and is performed at a specific time depending on the desired product.
Rosé wines require early racking, young red wines require medium racking, and aged red wines require late racking.
To perform racking, the wine is aerated by adding sulfur dioxide: this step is performed following the end of fermentation, when residual sugars reach 1-2%. Furthermore, aerating the wine removes any reductive odors.
Racking and Bottling Red Wine
Bottling red wine is the final stage of its production, preceded by stabilization.
Typically, a red wine is stabilized by racking after an analytical and organoleptic check: the liquid is moved from one container to another to separate the clear liquid from the lees (residues of yeast, bacteria, pesticides, and small pieces of skin). The number of rackings varies depending on the winery's procedures. A further step is the air test, which is performed by leaving a small quantity of wine at 20°C for 48 hours to check for any alterations in color or aroma.
Bottling red wine consists of filling the bottles with wine, inserting the cork and capsule, and labeling them. The wine is then ready for storage.
DIFFERENCE BETWEEN WHITE AND RED WINE MAKING
The difference between white and red wine making lies in maceration: it is always used in red wine making, while it is not used in white wine making (with the exception of macerated white wines or the popular "orange wines," which undergo extensive maceration, thus achieving golden and orange hues).
Since maceration serves to obtain a higher level of tannins and an intense pigment, typical of red wine, white wine production does not involve contact between the pomace and the must.

31/08/2026

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The use of dry ice during winemaking significantly limits the oxygen supply to the juices, thus controlling the amount of dissolved oxygen. After destemming, the must can be quickly cooled with dry ice (carbonic maceration) to around 5°C for about 12 hours in the press. The cold allows the must to absorb many aromatic substances, resulting in a wine particularly rich in primary aromas.
This process offers several advantages over traditional cooling, including a lower risk of unwanted fermentation and loss of aromas. Furthermore, it prevents yeast from developing before the must has settled, thus preventing the loss of aromas. In this case of carbonic maceration, dry ice is introduced directly into the maceration tank: 0.6 kg of CO2 lowers the temperature of 100 liters of must by 1°C.
The basis of the carbonic maceration process is maintaining the berries intact in an anaerobic environment at a constant temperature of around 30°C. These conditions promote a sort of self-fermentation of the berries, which causes the migration of aromatic and color substances from the outside to the inside. Temperature control is therefore essential for a successful carbonic maceration process, which is achieved by pre-saturating the tanks with solid CO2.
The application is very simple and the investment costs are low.
Dry ice is a food additive; it has a constant temperature of -78.5°C, and its sublimation (transition from solid to gaseous state) releases the frigories needed for refrigeration without leaving residues.
White grapes can be cooled to temperatures below 0°C and then pressed immediately, thus achieving a higher concentration of the must; this technique is particularly useful for late harvests. This way, the less concentrated grapes are frozen, as they do not release their juice during pressing, thus producing a smaller quantity of more concentrated must compared to the traditional technique.

29/08/2026

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27/08/2026

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White winemaking with maceration involves maceration of the skins for up to 12 hours in contact with the must at a temperature of 5°C prior to fermentation. A variant, called selective cryoextraction, involves freezing the grapes to -5°C followed by cold pressing.
How long does white wine maceration last?
The first phase lasts about 7-10 days and is called tumultuous: the formation of carbon dioxide causes the must to boil. The next phase, in the absence of oxygen, is called slow and can last from one to three months.
How to vinify white grapes? How is wine made?
Produce a clear must with few suspended solid particles; apply low pressure with gradual increases;
perform at low temperatures; limit contact with air to prevent oxidation.
How long should white grapes ferment?
For white grapes, ferment for only one day, while for rosé, using pomace, fermentation should be stopped after 18 to 24 hours at the latest.
When should wine be clarified?
Clarification begins once the must has fermented. The goal is to obtain a biologically and chemically stable wine, so that yeast, grape fragments, and other elements do not remain suspended and "pollute" the bottle.
How do you clarify wine?
The first method is decanting, a practice that involves slowly pouring the wine from the bottle into a carafe. The result is immediate: by decanting the wine, the colloids, deposited at the bottom of a bottle with resting wine, rise to the surface and mix with the liquid.
How is bentonite used to clarify wine?
Bentonite should always be swollen in water at a ratio of one to ten and is used after 12 hours. The swelling index is important = over 50 percent. Dosage: 50 to 100 g per hl. The lees form quickly and are fairly compact; they filter fairly easily.