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.