Posted by For years, oat milk has been one of the most successful plant-based dairy alternatives, winning over consumers with its creamy mouthfeel, sustainability profile, and naturally mild flavor. Yet one challenge has consistently limited its performance in premium coffee applications: foam.
Anyone who has attempted to create café-quality latte art with oat milk knows the struggle. Compared with dairy milk, oat milk often produces weaker, less stable foam—especially under hot conditions. But exciting new research suggests that cyclodextrin may hold the key to solving this problem.
A recent study demonstrates how in situ cyclodextrin generation can significantly enhance oat milk foamability and stability, opening new opportunities for clean-label plant-based beverages.
Why Oat Milk Foam Falls Short
The foaming behavior of dairy milk relies heavily on its protein structure. Heat-denatured milk proteins form strong elastic films around air bubbles, helping maintain foam integrity.
Oat milk, by contrast, lacks sufficient interfacially active proteins. The problem is further compounded by added lipids, such as canola oil, commonly used to mimic dairy creaminess. These lipids destabilize foam by disrupting bubble interfaces and accelerating collapse.
As consumer demand shifts toward clean-label formulations, manufacturers face increasing pressure to improve functionality without relying on synthetic additives or complex stabilizer systems.
This is where cyclodextrin enters the picture.
How Cyclodextrin is Formed in the Beverage In situ?
ater interfaces and improving foam formation.
The study explored this concept by generating cyclodextrins directly inside oat milk using the enzyme cyclodextrin glucanotransferase (CGTase) .
Rather than adding cyclodextrin as an external ingredient, the researchers produced it enzymatically from oat starch already present in the beverage—a highly attractive clean-label strategy.
Cyclodextrin Delivers Dramatic Foam Improvements
The results were striking.
The researchers found a strong near-linear relationship between total cyclodextrin concentration and foamability, with an R² value of 0.92.
Under optimized conditions:
- Foam half-life doubled
(600 seconds vs. 300 seconds) - Initial foam volume increased significantly
- Foam collapse was delayed
- Bubble structure remained finer and more stable over time
Most importantly, the performance improvements were achieved without increasing the number of directly added ingredients.
This makes cyclodextrin particularly valuable for food formulators seeking both performance and label simplicity.
How Cyclodextrin Works in Oat Milk
The study suggests two complementary mechanisms through which cyclodextrin enhances foam performance:
1. Lipid Sequestration
Cyclodextrin binds surface-active lipids that would otherwise destabilize foam films.
By reducing free lipid activity at the air–water interface, cyclodextrin allows proteins and other surface-active components to better stabilize bubbles.
2. Formation of Functional Cyclodextrin–Lipid Assemblies
The researchers identified lipid-associated fractions unique to cyclodextrin-treated oat milk that showed measurable foam-forming activity and reduced surface tension.
These complexes may actively contribute to interfacial stabilization.
In short: cyclodextrin doesn’t merely remove a problem—it appears to create new functional structures that improve performance.
Why This Matters for the Future of Plant-Based Beverages
Cyclodextrin has already proven valuable in food science for flavor masking and ingredient stabilization.
This research expands its potential into an especially important area: barista-grade plant milk functionality.
For manufacturers, cyclodextrin-enabled processing could provide:
- Better hot-foam performance
- Cleaner ingredient labels
- Improved café application
- Enhanced consumer acceptance
For consumers, this could mean plant-based cappuccinos and lattes with foam quality much closer to dairy milk.
K. Sakai, M. Okada and S. Yamaguchi, In situ enzymatic cyclodextrin generation enhances hot oat-milk foamability and stability, Food Research
International (2026), https://doi.org/10.1016/j.foodres.2026.119406
https://www.sciencedirect.com/science/article/pii/S0963996926010835