The Arrival of Dr. Hartog Elion
The year 1886 marked a turning point in Heineken’s history. While the brewery had already embraced modern brewing technology and bottom fermentation, the company now took a decisive step toward becoming a scientific pioneer.
At the initiative of brewmaster Wilhelm Feltmann, Heineken established its own research laboratory within the Rotterdam brewery. The executive board quickly recognised the importance of scientific brewing and approved the creation of a permanent research facility.
To lead this ambitious new laboratory, Heineken appointed Dr. Hartog Elion, a brilliant chemist and former student of the legendary French scientist Louis Pasteur. Elion would remain head of Heineken’s laboratory for more than three decades, shaping the company’s scientific direction until 1920.
Building a Laboratory Inside the Brewery
Until this moment, Heineken — like most European breweries — depended on yeast obtained from brewing centres such as Munich and Copenhagen. While these yeast cultures produced good beer, they were not fully controlled and could introduce inconsistencies or contamination.
The new laboratory allowed Heineken to take full control of fermentation, transforming brewing from craftsmanship into applied science.
The Rotterdam laboratory quickly became one of the most advanced brewing research facilities in Europe. Its mission was clear: isolate pure yeast strains and eliminate the mysterious spoilage that had troubled brewers for generations.
Improving the Pure Yeast Culture Method
Inspired by the groundbreaking research of Carlsberg scientist Dr. Emil Christian Hansen, Elion developed his own improved method for cultivating pure yeast cultures.
Rather than using Hansen’s open vessel technique, Elion initially worked with large 75-litre sterilised glass containers. Although difficult to handle, these vessels allowed him to produce large quantities of exceptionally pure yeast.
Soon after, Elion refined the process further by designing a specialised copper cultivation apparatus. This innovation allowed continuous, controlled yeast propagation and proved so reliable that similar systems remained in use for decades.
Thanks to this work, Heineken became only the second brewery in the world capable of producing and maintaining its own pure yeast cultures.
Heineken Becomes Europe’s Yeast Supplier
Elion’s research achieved something remarkable. He succeeded in isolating yeast strains that produced highly stable and consistent fermentation results. These strains were not only valuable to Heineken — they became highly sought after across Europe.
By 1886 alone, Heineken supplied more than 7,000 kilograms of pure yeast to breweries throughout Germany. At that time, the only institution in Germany which cultivated pure yeast at that time, was the Wissenschaftliche Station fur Brauerei in Munich, but for many years the station was unable to produce sufficient pure yeast to meet the demand
For many breweries between 1885 and 1900, access to high-quality yeast depended directly on Heineken’s laboratory work. The company quietly became a scientific leader in European brewing.
This A – strain is still used today only by HEINEKEN worldwide.
The Birth of the Legendary Heineken A-Yeast
Perhaps the most lasting result of Elion’s work was the isolation of a yeast strain that would define Heineken beer for generations.
This strain — later known as the Heineken A-Yeast — produced a balanced fermentation profile that delivered clarity, stability, and a distinctive flavour character. The yeast became the biological signature of Heineken beer.
More than a century later, this same yeast strain remains a closely guarded company secret and continues to be used in Heineken brewing worldwide.
Supporting page → Brewing Science & A-Yeast
Supporting page → Pasteur & European Brewing Research