How to Solve the Mouthfeel Problem in Non-Alcoholic Beers?

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The mouthfeel or “body” of beer is a multidimensional attribute that defines perceived quality and consumer acceptance.

In conventional beers, ethanol is primarily responsible for viscosity and oral warmth. However, in non-alcoholic beers, the removal of alcohol generates a “watery” and empty perception.

Recent research has identified that the key to compensating for this loss lies not only in increasing density but also in the synergistic interaction between dextrins and high molecular weight arabinoxylans (HMW AX).

Achieving high-quality non-alcoholic beer requires a reengineering of non-fermentable carbohydrates to replicate the tactile resistance that alcohol naturally provides.

Critical factors identified

• Reducing alcohol from 5% to 0% decreases physical viscosity by approximately 0.17 mPa*s.
• At least 30 g/L of additional dextrins are required to match the viscosity loss from dealcoholization.
• Just 1.2 g/L of high-molecular-weight arabinoxylans achieve the same viscous effect as large amounts of dextrin.
• Perceived mouthfeel only significantly improves when both carbohydrates are elevated simultaneously.

Beer beyond density

Historically, brewers have relied on dextrins (glucose polymers) to provide body. These are formed during mashing through starch hydrolysis.

However, dextrins in commercial beer typically have a low degree of polymerization (DP < 20), making them individually weak at altering liquid rheology unless used in massive concentrations.

The study by Michiels et al. (2024) introduces a paradigm shift by highlighting the role of arabinoxylans (AX). These non-starch polysaccharides, derived from barley cell walls, possess a linear xylose structure branched with arabinose.

Their high molecular weight allows them to create hydrodynamic networks that increase internal liquid friction, translating into a sensation of “creaminess” or fullness that consumers identify with quality beer.

To visualize this mechanism, imagine arabinoxylans as a fine mesh network trapping liquid between its fibers, similar to how a light gel retains water without becoming solid.

This flexible structure offers resistance to movement in the mouth, replicating the sense of weight that ethanol naturally provides.

Viscosity vs. perceived mouthfeel

A fundamental finding in modern sensory science is that physical viscosity (measured in the laboratory) does not always perfectly correlate with perceived mouthfeel as evaluated by a trained panel.

Although increasing viscosity is necessary, it is not sufficient to fool the human brain, which is accustomed to the chemical complexity of ethanol.

Body perception is an integrated sensory experience. Alcohol not only provides viscosity; it also reduces surface tension and modifies the release of aromas (volatility).

For example, compounds such as linalool, isoamyl acetate, and beta-ionone, responsible for floral, fruity, and malty notes, volatilize differently in the presence of ethanol.

Without alcohol, these aromas can be perceived as flatter or unbalanced, even if their chemical concentration remains unchanged. Therefore, body optimization must be accompanied by adjustments to the aromatic profile to maintain overall sensory complexity.

In non-alcoholic beers, if viscosity is increased only through dextrins, the result can be a dense but monotonous liquid. The introduction of arabinoxylans provides a different structural resistance that better mimics the tactile complexity of alcohol.

Strategies for carbohydrate optimization

For producers, optimizing these components does not necessarily require external additives but rather precise control of enzymes during the brewing process.

1. High-temperature mashing: Favors the formation of long-chain dextrins by limiting beta-amylase activity.
2. Xylanase management: Controlling the degradation of arabinoxylans during mashing is vital. Excessive degradation breaks high molecular weight chains (HMW), losing their viscosity-generating capacity.
3. Malt selection: Using unmalted cereals or specific malt types with higher non-starch polysaccharide (NSP) content can naturally elevate AX levels.

Caloric impact and technical efficiency

A critical advantage of prioritizing arabinoxylans over dextrins is caloric contribution. While dextrins provide 4 kcal/g, arabinoxylans, being dietary fiber, provide approximately 2 kcal/g.

This allows the production of non-alcoholic beers that not only have better body but also maintain a healthier nutritional profile, a decisive factor for the target audience of non-alcoholic beers.

From a technical standpoint, the challenge lies in filterability. An excess of high molecular weight carbohydrates can increase wort viscosity to levels that hinder the lautering process.

The optimal balance is achieved at 1.5 g/L of HMW AX, the point at which sensory benefit is maximized without compromising plant operational efficiency.

Sensory validation beyond the laboratory

Technical improvement only has value if it is perceptible to the consumer. Therefore, it is recommended to complement instrumental viscosity measurements with trained sensory panels that evaluate attributes such as mouthfeel density, persistence, and overall balance.

Standardized protocols such as quantitative descriptive analysis allow correlation of physical parameters with human perceptions, reducing the risk of launching products that, although technically optimized, do not connect with market expectations.

Additionally, consumer testing with end users in early development stages helps detect gaps between expert perception and actual experience.

This dual approach, laboratory + consumer, is key to closing the sensory gap that has historically limited the acceptance of non-alcoholic beers.

Frequently Asked Questions (FAQs)

1. Why do non-alcoholic beers often taste “watery”?

Mainly due to the absence of ethanol, which is a natural thickening agent. Without it, viscosity falls below the threshold that the palate recognizes as traditional beer, resulting in a water-like sensation.

2. What exactly are dextrins?

They are medium-chain carbohydrates formed during starch degradation. They are not fermentable by standard brewer’s yeast, so they remain in the final beer, contributing density and residual sweetness.

3. Do arabinoxylans affect beer clarity?

If well solubilized, they need not affect clarity. However, their presence increases foam stability, which is a desirable secondary benefit in non-alcoholic beers.

4. Can these components be added externally?

Yes, dextrin and arabinoxylan isolates exist (such as those used in the Food Hydrocolloids study), but the current trend is to generate them endogenously by manipulating mashing temperatures.

5. Is viscosity the only factor for “body”?

No. Factors such as carbonation, protein content, and polyphenols also contribute, but carbohydrate-derived viscosity is the main structural pillar in the absence of alcohol.

General conclusions

Improving quality in non-alcoholic beers has moved from a marketing challenge to a high-precision chemistry discipline. The strategic combination of 30 g/L dextrin and 1.2-1.5 g/L high molecular weight arabinoxylans represents the technical formula to close the sensory gap between non-alcoholic and traditional beers.

For the modern brewer, success lies in viewing mashing not only as a sugar extraction process but also as a polymer architecture aimed at building a superior tactile experience.

Reference

Michiels, P., Debyser, W., De Sutter, W., Langenaeken, N. A., De Rouck, G., & Courtin, C. M. (2025). Enhancing the mouthfeel of non-alcoholic beers: The influence of dextrin and arabinoxylan on perceived viscosity and body. Food Hydrocolloids, *159*, Article 110642. https://doi.org/10.1016/j.foodhyd.2024.110642

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