https://phys.org/news/2018-07-unwrapping-brewing-secrets-barley.html > The most important malting enzymes come from a layer of tissue in the barley grain called the aleurone, a health-promoting tissue full of minerals, antioxidants and dietary fibre. The researchers showed that the more aleurone present in the barley grain, the more enzyme activity the grain produced. > Barley is the second most important cereal crop for South Australia and contributes over $2.5 billion to the national economy. Much of its value comes from its use in beer and beverage production.