Dr. Arno Wouters: Plant Protein Colloidal State and Techno-Functionality

Why It Matters

By linking processing‑induced colloidal states to functional outcomes, the food industry can create more reliable, high‑quality plant‑based products, advancing sustainability and consumer acceptance.

Key Takeaways

• Protein colloidal state drives functional performance in plant‑based foods.
• Processing alters protein structure, affecting solubility, foaming, emulsification.
• 11S and 7S globulins form aggregates, gels, and coacervates.
• Targeted enzymatic or physical treatments can tailor techno‑functionality.
• Understanding structure‑function links accelerates development of sustainable meat alternatives.

Summary

The Good Food Institute hosted a seminar where Dr. Arno Wouters, associate professor at KU Leuven, presented his research on plant‑protein colloidal states and their techno‑functional implications. He framed the discussion around the broader concept of structure‑function relationships, emphasizing that protein behavior is shaped not only by molecular composition but also by raw‑material variability, matrix complexity, and processing conditions. Wouters highlighted that cereal and legume proteins, particularly the 11S (hexameric) and 7S (trimeric) globulins, can exist in multiple colloidal forms—fractal aggregates, nano‑gels, fibrils, and liquid‑liquid coacervates—depending on extraction methods, pH, temperature, and enzymatic treatment. These structural transitions directly impact key functionalities such as solubility, foaming capacity, emulsification stability, and gel formation, which are critical for plant‑based meat, bakery, and beverage applications. He cited a recent wet‑soy protein isolation study showing that commercial isolates often suffer from low solubility and poor functionality, whereas controlled processing (e.g., high‑pressure homogenization, enzymatic hydrolysis) can produce nano‑particles with enhanced foaming and emulsifying properties. Similar experiments with oat and faba bean proteins demonstrated that tuning the colloidal state yields predictable changes in texture and mouthfeel. The overarching implication is that a mechanistic understanding of protein colloidal behavior enables food developers to design ingredients with targeted performance, reducing reliance on additives and accelerating the rollout of sustainable, animal‑free products.

Original Description

Seminar Series: The Science of Alt. Protein

Plant protein colloidal state and techno-functionality

Dr. Arno Wouters

Laboratory of Food Chemistry and Biochemistry, KU Leuven

June 11, 2026

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Globular plant proteins generally lack in their techno-functionalities, such as foaming, gelling, and emulsifying, as compared to animal proteins. This relates to their inherent structural characteristics, but also to the fact that commercially available plant protein ingredients contain heavily aggregated proteins. In addition, it has recently become clear that globular plant proteins tend to self-assemble into specific colloidal states depending on the environmental conditions, such as changing pH and salt concentration. The implications of such supramolecular structural organization for the functionalities of the proteins in food systems remain unclear.

In this presentation from Dr. Arno Wouters, several examples are given regarding the self-assembly of globular plant proteins into different aggregation states, depending on prior processing or altered environmental conditions. The link to protein techno-functionality is made as well. In conclusion, Dr. Wouters demonstrates the importance of considering protein colloidal state when utilizing globular plant proteins as functional food ingredients.

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Meet the speaker:

Arno Wouters is an associate professor in Food Chemistry at the Laboratory of Food Chemistry and Biochemistry at KU Leuven, Belgium. Arno is particularly interested in exploiting the potential of various plant protein sources for structuring food. His research focuses on establishing structure-function relationships for cereal and legume proteins. An important focus point is the relationship between protein colloidal state, dictated by prior protein isolation, varying environmental conditions and targeted modification, and the implications thereof for protein functionality. Another focus point of his research is mechanistically studying protein functionalities, with particular emphasis on protein foaming, at different length scales.

Moderator:

Bianca Datta, Ph.D., Senior Scientific Partnerships Manager, The Good Food Institute

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About The Good Food Institute:

The Good Food Institute is a nonprofit think tank and international network of organizations working to accelerate alternative protein innovation to build a more sustainable, secure, and just food system.

Learn more at https://gfi.org/​

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