In modern winery management, tartaric stability represents one of the most resource-intensive technical challenges. For decades, forced cooling has been the primary tool used to guarantee the absence of precipitates in the bottle. However, in today’s context, this subtractive approach shows clear limitations in terms of sustainability, operational costs, and product integrity.
The transition toward colloidal stabilization is not merely a technological update, but a step forward toward a more respectful and rational oenology.
1. Moving beyond the cold: savings and quality
Traditional thermal treatment requires holding wine at temperatures near freezing (typically between -3°C and -4°C) for periods ranging from one to two weeks. This process involves massive energy consumption. In fact, according to ENEA, refrigeration systems can account for up to two-thirds of a winery’s total electricity consumption during the refining phase.
Beyond the economic impact, forced cooling acts indiscriminately on the wine’s structure. As a subtractive technique, the precipitation of tartrate salts drags down valuable colloidal and phenolic fractions. In red and rosé wines this often results in a loss of color intensity and structure. In whites, thermal shock can cause aromatic closure or premature oxidation due to the increased solubility of oxygen at low temperatures.
Eliminating the cold stabilization phase means not only lowering energy bills but, above all, respecting the wine’s vitality, preserving the volume, color, and aromatic profile that the producer has painstakingly built in the vineyard and during fermentation.
Adopting alternative solutions allows producers to:
- Drastically reduce energy consumption by eliminating the need for pre-bottling forced refrigeration.
- Preserve the wine’s identity, avoiding thermal shocks that can accelerate oxidative processes or extinguish delicate aromas.
2. Gum arabic and mannoproteins: active protection
While cold stabilization seeks to remove crystal precursors, colloidal stabilization works by keeping tartaric salts in solution. The physicochemical principle is as simple as it is effective: the use of natural protective colloids that act as a molecular “shield,” physically preventing micro-crystals from aggregating.
- Gum arabic (Acacia Verek): not to be confused with a simple additive for smoothness. Gum arabic binds to burgeoning potassium bitartrate nuclei, isolating them and preventing them from developing into visible crystals at the bottom of the bottle. It is an elegant solution that guarantees long-term crystalline clarity without altering the wine’s analytical parameters, while significantly improving gustatory persistence.
- Selective mannoproteins: extracted from the cell walls of yeast (Saccharomyces cerevisiae), mannoproteins not only interfere with tartaric crystallization, ensuring long-lasting stability even under difficult storage conditions, but also interact positively with the aromatic component. They contribute to protein stability and enhance the sensation of body and roundness, simulating and accelerating the beneficial effects of long aging on fine lees (sur lie).
The efficacy of these treatments, as confirmed by recent publications in MDPI Molecules, offers stability guarantees that often exceed those obtained through physical methods, especially for wines destined for export to markets with extreme climates.
3. Transparency and new regulatory obligations
With the introduction of the new EU digital labeling regulations (Reg. EU 2021/2117), transparency regarding production processes has become mandatory. The use of natural processing aids allows producers to meet the demands of a market increasingly focused on Clean Label products. With gum arabic and mannoprteins, we ensure stable wine without invasive chemical or physical interventions.
Our solution: Kordofix 3.0
For the practical application of these protocols, we have developed Kordofix 3.0, a formulation that integrates Kordofan gum (Verek) and selective mannoproteins. The aim of the product is to provide complete tartaric stability by eliminating the need for forced refrigeration, while preserving the aromatic fraction and original tactile structure of the wine.
The effectiveness of Kordofix 3.0 derives from a purification process of Kordofan gum that preserves its high molecular weight, a necessary condition for long-lasting colloidal protection. Unlike other gums, Kordofan guarantees a low clogging index, making the product ideal even for wines close to final filtration.
Unlike traditional subtractive methods, Kordofix 3.0 acts while respecting the integrity of the wine. Its levorotatory structure acts effectively as a protective colloid, inhibiting the growth of tartaric crystals and stabilising the unstable colouring fraction. At the same time, the protein component derived from yeast acts on the structure of the wine, increasing its softness and reducing dryness due to any aggressive tannins, thus improving the overall taste balance.
The use of this broad-spectrum stabiliser allows the shelf life of batches ready for bottling to be precisely managed, ensuring perfect stability even in critical temperature conditions.
The integration with selective mannoproteins is not a simple addition; it creates a stable complex that acts on two levels:
- Kinetic Inhibition: the Kordofan gum blocks the growth of bitartrate crystal nuclei.
- Thermodynamic Inhibition: the mannoproteins reduce the system’s free energy, making the precipitation of tartrate salts thermodynamically less favorable, even in the event of post-bottling thermal fluctuations.
This balance allows for the management of tartaric stability with modest dosages, respecting the wine’s filterability while improving the stability of the aromatic fraction and color.
We are available to provide samples and technical assistance to verify the effectiveness of Kordofix 3.0 directly in the cellar.