The enzymes produced within the barley seed during germination break down starch into malt sugar, or maltose, which is then fermented by yeast to yield alcohol and carbon dioxide.

• 大麦种子中的在萌发过程中将淀粉转化成麦芽糖，麦芽糖通过酵母菌发酵，产生酒精和二氧化碳。