Why does the upper layer of craft beer have to have foam?
In our perception, you must not have foam when pouring beer. If there is foam, you will be thought that you will not pour wine and will be ridiculed. But every cup of beer served in the table has foam. If there is no foam, people will be suspected of whether it is craft beer. Then why must there be foam on the upper layer of craft beer?
First, let’s learn about the composition of the upper foam of industrial beer and craft beer:
Industrial beer foam: It is caused by the foam formed by the carbon dioxide filled in the production process. As the contact with the air, the foam will quickly dissipate
craft beer foam: foam protein It is the germination process of malt and the saccharification process of protein decomposition . The protein in beer can be regarded as polypeptide . These proteins tend to connect to each other through the unstable compound bond . There is also some organic acids precipitated by hops during fermentation projects, such as some bitter ingredients. These elements connect to each other, thus building the stability of the bubble.
The function of beer foam:
The foam of beer will cover the beer, the fragrance will not be emitted quickly, and the strong fragrance will still be immersed in the beer, so the fragrance of craft beer is very strong. The main factors for evaluating the quality of wine through foam are durability, wall hanging properties and strong fragrance. The foam produced by inferior beer mainly exists above the beer. The foam of craft beer is easily stuck to the bottle wall and has a strong wall hanging ability.
You can simply smell it with your nose. Craft beer has a strong fragrance, which lasts for a long time and has been sweet for a long time. Ordinary industrial beer is just the fragrance produced by so-called edible-grade fragrances. In comparison, we will find out immediately.
foam contains a lot of bitter substances and hop resin. Isotrophic ketone can improve foam stability and also help foam cup-hanging properties. Beer with heavy bitterness tends to get higher foam satisfaction. The performance of beer hangers depends on the hydrophobic properties of these substances.
