Aquafaba: the science behind baking’s most surprising egg replacer

From chickpea cooking water to functional foam — what applied science tells us, and what it means for your bakery

If you had told a pastry chef a decade ago that chickpea water could replace egg whites, they might have laughed. Today, aquafaba has moved from curiosity to a serious subject of food science. 

For bakery professionals working on egg reduction or plant-based reformulation, understanding how it actually works is essential.

What makes aquafaba functional? 

Aquafaba is 90–95% water, but the remaining fraction defines its functionality. It contains proteins, soluble polysaccharides (pectins and starches), and saponins extracted during cooking. 

Its performance comes from the interaction between these components — not protein alone. Together, they create foam-forming and emulsifying behaviour.

Recent research shows that: 

• Proteins and carbohydrates in the 30–100 kDa range drive foam formation 
• Concentrating aquafaba (reducing volume to 50–70%) improves foam stability 
• Proteins and polysaccharides work synergistically, not independentlyb 

For R&D, this means aquafaba is not a fixed ingredient — its functionality depends on how it is produced and processed.

Canned vs. homemade 

A systematic review of 17 studies highlights clear differences: 

• Canned aquafaba → higher foamability 
• Homemade aquafaba → stronger emulsification potential 

Performance depends on: 

• Soaking (8–10 hours, 4°C, 1:4 ratio) 
• Cooking method (pressure cooking outperforms boiling) 
• Post-processing (cooling with liquid for 24 hours)
• Additives (cream of tartar and citric acid improve stability) 

Chickpeas without salt or EDTA produce better-performing aquafaba — a key sourcing consideration.

The role of hydrocolloids 

A known limitation of aquafaba is structural instability. Cakes can collapse due to weaker foam structure compared to egg systems. 

Research shows that adding small amounts of hydrocolloids (e.g. HPMC at 0.2%) significantly improves volume and stability. The mechanism is simple: hydrocolloids slow bubble collapse and strengthen the foam network. 

This highlights an important principle: aquafaba works best as part of a system, not as a standalone replacement. 

What this means in practice 

Aquafaba performs well in: 

• Sponge cakes 
• Meringues 
• Muffins 
• Light batters 

It is less effective in: 

• Emulsion-heavy systems 
• Products relying on egg yolk functionality In these cases, combinations with emulsifiers or fats are required. 

From knowledge to product 

Understanding aquafaba is one step — applying it consistently at scale is another. 

At Bakery Academy, we approach this through system design: 

• Mapping egg functions in your product 
• Testing substitution combinations 
• Validating performance under real production conditions 

Aquafaba is not a magic ingredient. It is a functional material — and it behaves according to formulation and process.

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