Home Colors & Flavors Europe: Barry Callebaut, partners craft yeast starter cultures to ferment cocoa

Europe: Barry Callebaut, partners craft yeast starter cultures to ferment cocoa


The Barry Callebaut Group and its partners have improved the process of cocoa fermentation.

Researchers from the company, VIB (Flanders Institute for Biotechnology) and KU Leuven (University of Leuven), with the support of IWT (Agency for Innovation by Science and Technology-Flanders) worked on the project together.

Building on techniques inspired by Belgian brewers, the researchers developed a special yeast that unlocks the flavor and aroma precursors in cocoa beans and enriches the chocolate’s full flavor development.

With the new yeast Barry Callebaut will now be able to customize the flavor development of cocoa to the specific needs and wants of its customers more than ever.

Improved, superior tasting chocolate

For the past three years, Professor Kevin Verstrepen and his team at VIB and KU Leuven isolated hundreds of yeasts from cocoa fermentation processes on various pilot sites of the Barry Callebaut Group in Africa and Asia Pacific. These yeasts were then examined in labs to determine which characteristics yielded superior chocolate.

Based on the results, the research team developed a new yeast strain combining all the desirable traits.

“When this ‘new yeast’ is added while the cocoa is fermented in the bush, the process becomes faster and more consistent”, said Professor Verstrepen.

“Moreover, the new yeast strain produces more desirable aroma compounds and hampers the growth of unwanted yeast. The result is even tastier chocolate.”

From beer to cocoa

The process of cocoa fermentation is based on Saccharomyces cerevisiae or the yeast used to brew beer.

“A completely natural process – refined during a hundred years of winemaking and beer brewing – now makes it possible to unlock the flavor and aroma precursors in the cocoa beans,” said Gino Vrancken, Global R&D Program Manager at the Cocoa Science Team at the Barry Callebaut Group.

“A Belgian artisan product will now contribute to a new national pride. We could not make this story any more Belgian.”

10 years of research on fermentation

The Barry Callebaut Group has two fermentation research facilities dedicated to finding ways to optimize the natural fermentation processes and to develop insights in creating exciting new flavors.

For nearly 10 years, the Barry Callebaut Group has been a pioneer in the field of controlled cocoa fermentation, a 100% natural process.

Experiments were conducted with several microorganisms in a microbial starter process.

Today, the company, in collaboration with the Verstrepen Lab (VIB / KU Leuven), could craft yeast starter cultures that enrich the full flavor development of the end product, chocolate with a more intense flavor.