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No More Foamy Beer, Thanks To Magnets
sciencehabit writes Few sights at a bar are more deflating than a bottle of beer overflowing with foam. This overfoaming, called gushing, arises when fungi infect the barley grains in beer's malt base. The microorganisms latch onto barley with surface proteins called hydrophobins. During the brewing process, these hydrophobins can attract carbon dioxide molecules produced by the mashed barley as it ferments, making the beer far too bubbly. Brewers try to tamp down the gushing by adding hops extract, an antifoaming agent that binds to the proteins first. Now, food scientists in Belgium have hit upon a technological solution: magnets. When the team applied a magnetic field to a malt infused with hops extract, the magnets dispersed the antifoaming agent into tinier particles. Those smaller particles were much more effective at binding to more hydrophobins, blocking carbon dioxide and decreasing gushing. During tests in a real brewery, the magnets decreased excess foaming so effectively that brewers needed much lower amounts of hops extract—a potential cost-saving measure. Future studies could explore whether magnetic fields alone could reduce foaming on an industrial scale, the team says.
Magnets... how do they work?
Beer overflow seems to occur more frequently in the smaller refrigerator I have in the basement. When I open a beer bottle or can (usually a craft beer) it will often overflow, something that almost never happens in the upstairs kitchen. It runs a little cooler than our main refrigerator and the bottles are often horizontal. Are these two factors contributing to the overflow? Is the downstairs beer more excited to get in my belly? Whats the science behind it?
Exactly. Brewers *already* have anti-foaming measures at their disposal. The most well-known is Fermcap, a silicone-based solution which reduces surface tension. The use of hops -- in extract form or otherwise -- has nothing to do with reducing foaming, and everything to do with flavor, aroma, and preservation.
The opinions stated herein do not necessarily represent those of anybody at all. Deal with it.
This isn't really a new anti-foaming measure, it's making them more effective. That was the point, the magnetic field made the particles tinier so they could disperse and bond more per unit.
But you appear to be wrong about hops only to do with flavor, aroma, and preservation as at least one beer maker and several scientists seem to think it has to do with combating too much foam also.
It's probably got more to do with the fact that cask ale is brewed, while the other revolting piss is manufactured.
I thought they were going to say, tape two cow magnets along your neck before drinking beer
if this is supposed to be a new economy, how come they still want my old fashioned money?
A higher level of hop oil (or pretty much any vegetable oil, really) will indeed reduce foaming. But that is primarily of academic concern, because you simply *can't* play with the hop levels without affecting the flavor. A brewer will perfect the taste, aroma, color, texture, etc. of a beer before they even start thinking about practical concerns such as blow-off. Which is fine, because as I said, there are already solutions (pun intended) for blow-off, which don't involve reformulating your recipe.
A brewer who saw excess foaming in his dubbel, and added hop oil to try to combat it, would find that he was no longer making a dubbel.
The opinions stated herein do not necessarily represent those of anybody at all. Deal with it.
Pasteurisation denatures the proteins in the keg Beer which why the head on keg beer don't last and that allows the C02 escape in the glass and that is why Keg beer has the metallic smell. The gas added to keg is also a mix of nitrogen and C02 to try and minimise that metallic smell.
The naturally produced C02 of cask is retained by the head and also includes aromas from the Beer particularly the hops.
And cheese is rotten milk. It still tastes great though, and perfectly fine to eat. Same with beer (excluding commercial American brands like Schlitz which are universally undrinkable).
Apart from the minor fact that it's basically been boiled.
Confucius say, "Find worm in apple - bad. Find half a worm - worse."
The CO2 from kegged beer will have less C14 as the carbon will be from fossil sources. This makes all the difference in the world.
(Maybe not.)
Iron Maiden Beer
I can hear thier brewmaster now: "Can I Play With Magnets?"
Any insufficiently advanced magic is indistinguishable from technology.