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Home Science News Chemistry

Accelerating Sour Beer Brewing: Harnessing Sugars from Peas

February 5, 2025
in Chemistry
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Sour beers, recognized for their unique tartness and complex flavor profiles, have taken the craft brewing world by storm. However, the traditional brewing process for these brews can be notoriously lengthy and intricate, often stretching from several months to multiple years. Recent advancements in brewing science have introduced an innovative approach to creating sour beers using an unconventional ingredient: field peas. Researchers have pioneered a method that significantly shortens the fermentation timeline while achieving similar sensory attributes to established Belgian-style sours. This novel research, published in the esteemed Journal of Agricultural and Food Chemistry, may forever change the landscape of sour beer production.

The heart of sour beer’s flavor profile lies in the production of lactic acid, typically cultivated by lactic acid bacteria (LAB) or the wild yeast strain Brettanomyces. Traditional sour beer brewing usually necessitates months of fermentation, where these microbes convert the sweet wort—a sugary liquid extracted from brewed grains—into a tart beverage. This extended fermentation period has been a significant barrier for both commercial breweries and hobbyists seeking to produce quick-turnaround sour beers. Led by researcher Bjørge Westereng and his team, the quest for alternative sugars conducive to rapid fermentation has led them to explore beyond the grains traditionally used in brewing.

Their focus shifted to pulses, a category of leguminous crops that includes lentils, beans, and notably, field peas. Pulses are considered environmentally sustainable with a lower carbon footprint compared to cereal crops such as barley. Furthermore, they introduce a unique class of sugars known as raffinose-family oligosaccharides (RFOs). These sugars are easily metabolized by LAB, providing them with a quick and efficient energy source, thus optimizing and potentially expediting the sour beer fermentation process. This examination of alternative sugar sources marks an exciting frontier in brewing innovation.

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In their recent experiments, the research team extracted RFOs from field peas and incorporated them into sour beer production. They crafted four unique sour beers, two of which utilized field pea-derived RFOs while the other pair did not, serving as a controlled variable. The fermentation period was consistent across all batches, lasting 19 days during which the Brettanomyces clausennii yeast and specific combinations of LAB were introduced. The results were nothing short of revelatory.

Chemical analyses conducted post-fermentation revealed that the formulations utilizing the RFOs from field peas achieved strikingly high levels of lactic acid and ethanol. This increase is significant since both compounds are essential contributors to the sour profile and overall alcoholic strength of the beer. The addition of these RFOs resulted in beers that boasted not only a more pronounced fruity flavor but also a heightened acidity level that could rival that of commercial sour beers. The sensory panel tasked with evaluating the final products reported a significant difference in the taste experience derived from those brewed with the field pea RFOs, noting that they achieved a heightened overall flavor intensity without any of the undesirable “beany” notes historically associated with pulses.

Moreover, one of the fascinating outcomes of this study was the complete utilization of the RFOs by the LAB during fermentation. This is a noteworthy finding, as RFOs are often associated with gastrointestinal discomfort for some consumers when left unfermented. The research implies a dual benefit: not only does the inclusion of field pea sugars facilitate a quicker fermentation process, but it does so without compromising on taste or consumer comfort.

Westereng’s team hopes that their findings will inspire brewers, both commercial and home-based, to rethink the use of pulses in brewing. They envision a future where the incorporation of pulse-derived ingredients in beverages is commonplace and accepted among consumers. The sustainability aspect tied to the cultivation of pulses presents an additional compelling argument for breweries to pivot towards such innovative alternatives as the demand for environmentally conscious practices in food and beverage production continues to rise.

It is important to highlight that this research is just one piece of a larger puzzle concerning the sustainable development of beer production. With environmental considerations at the forefront of industry trends, showing that nutritious and sustainable ingredients can create high-quality products without compromising on flavor is a significant leap. This research could inspire further curiosity into other non-traditional crops that could be integrated into brewing.

The possibility that sour beers could soon be made more efficiently has broad implications for the beer industry. Rapid brewing processes might encourage creativity among craft brewers, allowing for more experimental, limited-edition sours to be made available to the public in shorter time frames. As demand for craft beer continues to escalate, having a trained palate capable of recognizing and appreciating complex flavors will be vital. Therefore, methods that streamline processes without sacrificing quality will likely gain traction and instigate new trends in the ever-evolving world of brewing.

As the landscape of craft brewing diversifies, pioneering studies like this one not only expand the understanding of potential ingredients but also push the boundaries of traditional brewing methods. Researchers, brewers, and consumers alike stand to benefit from these advancements, and it’s essential that the narrative of sustainability and innovation continue to permeate discussions on future brewing practices. The drive for efficiency, sustainability, and exceptional taste is now at the forefront of brewing innovation, promising an exciting future for sour beer enthusiasts.

Subject of Research: Pulses in Beer Production
Article Title: Pea-Derived Raffinose-Family Oligosaccharides as a Novel Ingredient to Accelerate Sour Beer Production
News Publication Date: 5-Feb-2025
Web References: https://pubs.acs.org/doi/10.1021/acs.jafc.9b05459
References: DOI 10.1021/acs.jafc.4c06748
Image Credits: Not specified

Keywords

Tags: accelerated sour beer productionalternative sugar sources for brewingBelgian-style sour beer alternativesbrewing science innovationscraft beer advancementscraft brewing research publicationsinnovative fermentation methodslactic acid fermentation processmicrobiology in brewingrapid fermentation for sour beerssour beer brewing techniquesusing peas in brewing
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