
Louis Pasteur Patents How to Brew Beer – January 28, 1873
Beer was first made by the Sumerians, and the technology was absorbed into the Babylonian and ancient Egyptian cultures. The practice of the Sumarians was to bake grains into bread, and the bread was moistened to begin the process of making beer. The baked bread was a way to preserve the grain for later use in the beer making process. A Sumerian beer was recreated recently by the folks at Anchor Steam Beer, as an experiment.
In more recent times, Louis Pasteur studied beer and wine making and patented a process for making beer which resulted in a better beer. Previously the wort was boiled and exposed to the air for cooling. In Pasteur’s process, the wort is kept in closed vessels and cooled by spraying the outside of the vessel with water. A special yeast was introduced into the mash after it cooled, thus preventing contamination of the wort with stray wild yeasts floating through the air.
More about Louis Pasteur
Louis Pasteur, the renowned French microbiologist and chemist, revolutionized the brewing industry with his pioneering research on fermentation and beer spoilage in the 19th century. Through meticulous studies, Pasteur proved that alcoholic fermentation is caused by living yeast cells converting sugar into alcohol and carbon dioxide, debunking the outdated theory of spontaneous generation. His groundbreaking 1876 book, Études sur la Bière, detailed the “diseases” of beer caused by contaminating bacteria and wild yeasts, providing brewers with scientific insights to produce cleaner, more consistent beers.
Pasteur’s discoveries led to the development of pasteurization—a gentle heating process that kills harmful microorganisms without altering flavor—first applied to beer to extend shelf life and prevent souring. This innovation not only elevated French brewing to compete globally but also laid the foundation for modern hygiene practices in the craft beer world, ensuring safer and higher-quality brews enjoyed by enthusiasts today. Pasteur’s enduring contributions continue to inspire brewers committed to excellence in fermentation science and product stability.
For Fun Beer Facts, Trivia and more: Click Here





