Filtration and Stability in Alcohol Free and Low Alcohol Wine

Dealcoholisation usually follows standard fermentation, with alcohol then reduced or removed using technologies such as reverse osmosis vacuum distillation or spinning cone columns. Although the product remains wine, its behaviour changes once alcohol is removed.

Lower alcohol levels mean reduced natural protection against microorganisms. At the same time changes to protein solubility polysaccharide interactions and tartrate behaviour can affect clarity filterability and overall stability.

Without the protective role of alcohol, low and no alcohol wines are more sensitive to spoilage. Some microorganisms such as osmophilic yeasts (e.g. Zygosaccharomyces) and acetic acid bacteria may pose increased spoilage risk under low alcohol conditions. This means stabilization needs closer attention during processing and bottling. Heat treatment is generally avoided due to its impact on aroma and freshness, so cold clarification and sterile filtration are typically preferred.

Final membrane filtration before bottling becomes a key step. Filtration at 0.45 µm removes microorganisms and helps prevent refermentation off flavours and turbidity while maintaining sensory quality.

For example, Supor* Beverage filter cartridges SBB are validated with wine relevant microorganisms, are fully integrity testable and are designed to limit interaction with wine components. This supports microbial retention while helping preserve wine quality across packaging formats.

Colloidal stability determines whether a wine stays clear over time. Instability can lead to haze or sediment, which affects visual quality. These changes are driven by interactions between proteins polysaccharides phenolic compounds and tartrate salts.

In no and low alcohol wines this balance is more difficult to maintain. Removing ethanol alters the physico chemical equilibrium, increasing the likelihood of haze formation tartrate precipitation and reduced filterability.

Stabilization typically combines clarification with final filtration. Depth filtration can reduce colloidal load before membrane filtration, which supports filterability and helps manage fouling risk.

SUPRA™ depth filtration technologies are used within clarification strategies to support consistent processing. When combined with validated membrane filtration at bottling, this approach helps maintain clarity and stability in finished alcohol free and low alcohol wines.

Filtration supports stability at multiple stages. Early clarification reduces particulate and colloidal load. Final membrane filtration provides a defined barrier to microorganisms just before packaging.

Together these steps help address the specific challenges of alcohol free and low alcohol wines while supporting consistent quality sensory properties and shelf life.

Learn how depth and membrane filtration technologies support alcohol free and low alcohol wine processing from clarification through to bottling.