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Fungus Amungus: Microbes in the Tailoring of Barley Malt Properties

August 27, 2007 By Jay Brooks

This Friday, August 31, Research Scientist Arja Laitila will be defending her thesis, Microbes in the Tailoring of Barley Malt Properties, at the University of Helsinki, in the hopes of being awarded her PhD.

Arja Laitila

Her goal?

Microbes – bacteria, yeasts and filamentous fungi – have a decisive role in the barley-malt-beer chain. Microbes greatly influence the malting and brewing performance as well as the quality of malt and beer. A major goal of the dissertation was to study the relationships between microbial communities and germinating grains during malting.

The research for her dissertation investigated the impacts of bacterial and fungal communities on barley germination and on malt properties. Her work “revealed that by modifying the microbial populations during malting, the brewing efficiency of malt can be notably improved. Well-characterized lactic acid bacteria and yeasts provide a natural way for achieving safe and balanced microbial communities in the malting ecosystem. She showed that the malting ecosystem is a dynamic process, exhibiting continuous change. The microbial communities consisting of various types of bacteria, yeasts and filamentous fungi form complex biofilms in barley tissues and are well-protected. Inhibition of one microbial population within the complex ecosystem leads to an increase of non-suppressed populations, which must be taken into account because a shift in microbial community dynamics may be undesirable. Laitila found some new microbial species in the malting ecosystem.”

 
More from the press release:

Suppression of Gram-negative bacteria during steeping proved to be advantageous for grain germination and malt brewhouse performance. Fungal communities including both filamentous fungi and yeasts significantly contribute to the production of microbial b-glucanases and xylanases, and are also involved in proteolysis. Well-characterized lactic acid bacteria (Lactobacillus plantarum VTT E-78076 and Pediococcus pentosaceus VTT E-90390) proved to be effective way in balancing the microbial communities in malting. Furthermore, they have positive effects on malt characteristics and they improve wort separation.

Previously the significance of yeasts in the malting ecosystem has been largely underestimated. This study showed that yeast community is an important part of the industrial malting ecosystem. Yeasts produced extracellular hydrolytic enzymes with a potentially positive contribution to malt processability. Furthermore, several yeasts showed strong antagonistic activity against field and storage moulds. Addition of a selected yeast culture (Pichia anomala VTT C-04565) into steeping restricted Fusarium growth and hydrophobin production and thus prevented beer gushing. Addition of Pichia anomala into steeping water tended to retard wort filtration, but the filtration was improved when the yeast culture was combined with Lactobacillus plantarum E76. The combination of different microbial cultures offers a possibility to use different properties, thus making the system more robust.

For the more technically inclined among you, a pdf of her dissertation is available online.

 

Filed Under: News Tagged With: Europe, Malt, Press Release, Science of Brewing

Turning Water into Happoshu

December 10, 2006 By Jay Brooks

japan
In Japan it will cost you two to three times as much as it does in the rest of the world if you’re keen to drink a beer. That’s because the Japanese government in their infinite wisdom (why is it governments are all so dogmatically stupid in creating laws without thinking them through?) placed an onerous tax on any beer who’s weight of malt extract exceeds 67% of the fermentable ingredients. In fact, that is their definition of what beer — biiru in Japanese — is. This was done to protect the more traditional sake (or nihonshu) and, of course, it backfired.

Breweries did just what you’d expect them to do. They began making beers with less than 67% malt, using rice or other adjuncts. Suntory made the first one in 1994, called Hop’s Draft, and it contained 65% malted barley. Because it no longer fit the definition of beer, a new name was required and it has become known as happoshu, which means “sparkling alcohol.” Naturally the Japanese government saw what was happening but instead of reversing a foolish decision, changed the standard to 50%. Japanese brewers responded by lowering the malt even further so that today about 25% malt in happoshu is common. The lower malt produces more fusel alcohol that many argue leads to greater hangovers. By all accounts, it tastes awful but has been growing in popularity because it’s so much cheaper. One snarky account I read mentioned that happoshu tastes more like American beer.

Recently, around thirty students from Fuji Women’s University, a catholic school, worked with a local brewer, Yasuharu Osugi, from Nihon Ji Biiru Kobo, to develop a pink happoshu brew aimed specifically at women. In hopes of it appealing to females, they lowered the hop character and made it 4.5%, so it’s a bit weaker than most happoshu. The ingredients include a hoshinoyume, a local rice, along with the herb shiso, a pink-colored juice that gives the brew its distinctive hue. The label will feature a four-leaf clover and goes on sale today.

pink-happoshu
Students from Fuji Women’s University give their pink happoshu a taste test.

It being a catholic university, they chose the name “Cana Story,” after the place in the new testament story in which Jesus is supposed to have turned water into wine. Of course, it may be fitting. I’ve heard some credible theories that when the new testament was translated from Hebrew into Greek that they had no word for beer and thus translated the line to wine instead. Certainly beer being mostly water would make more sense, though makes it a bit less miraculous.

cana

Filed Under: Beers, News Tagged With: Asia, Business, Malt

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