Researchers at Chalmers University of Technology in Sweden have developed a fully bio-based architectural material made from baker’s yeast, opening a new path toward circular, renewable building components.
The material combines baker’s yeast, wood-derived cellulose fibres, alginate from brown seaweed, plant-based glycerol and water into a hydrogel that can be 3D printed at room temperature.
The result is a customisable, biodegradable alternative to plaster, plastics and synthetic textiles currently used in architectural elements such as light-filtering screens, wall panels and room dividers.
The construction sector is one of the largest contributors to global emissions and resource consumption, creating urgent demand for sustainable alternatives.
The Chalmers research team, led by Professor Malgorzata Zboinska of the Department of Architecture and Civil Engineering, investigated how industrial residual products could be transformed into new materials supporting greater circularity in the built environment.
The manufacturing process begins similarly to baking: yeast is first heat-deactivated to stabilise the formula, then blended with the remaining ingredients into a smooth mass.
This hydrogel is extruded through pressure-based 3D printing, requiring neither energy-intensive heating nor support structures, and producing virtually no waste.
The approach gives designers precise control over shape, texture and material distribution throughout the finished component.
A notable characteristic of the material is its adjustability.
Transparency, colour and surface texture can all be modified through minor changes to the formula.
Natural pigments or pigment-producing yeast strains can shift the material’s natural yellow-to-brown hue, and varying the composition changes how it feels and how much light it transmits.
What makes the Chalmers formula distinctive is that yeast functions as biomass and a binding agent rather than as a fermenting organism.
It provides volume, viscosity and structural stability to the mixture.
The researchers also highlight the potential for using residual yeast from brewing and agricultural industries, diverting waste streams that would otherwise be discarded.
Unlike conventional building materials engineered for maximum longevity, this bio-based material is designed with biodegradability in mind.
The team views the eventual degradation of a component as a feature rather than a flaw, reflecting a shift toward shorter material life cycles in sustainable design.
The study, Novel 3D Printable Yeast-Based Materials for Architectural Applications, was published in Frontiers of Architectural Research and funded by the Swedish Energy Agency.
