Quick bread leavening agents include a weak base, such as baking soda (sodium bicarbonate) plus a weak acid, such as cream of tartar, lemon juice, or cultured buttermilk, to create an acid–base reaction that releases carbon dioxide. (Quick bread leavened specifically with baking soda is often called "soda bread".) Baking powder contains both an acid and a base in dry powdered form, and simply needs a liquid medium in which to react. Other alternative leavening agents are egg whites mechanically beaten to form stiff peaks, as in the case of many waffle recipes, or steam, in the case of cream puffs. Nevertheless,
Barley flour stop germination). Malt flour is used as a diastatic supplement for other bread flours that have low natural diastatic activity. Diastatic activity involves the conversion of starches into maltose (sugar). In baking, adding malted barley flour to wheat flour results in a softer, moister product than would wheat flour alone. Malted barley flour that is rich in protein content is typically used in the food industry, while that which is poor in protein content is typically used to prepare a unique style of beer. Malt flour is sometimes used to supplement the flavor of the malt loaf. Patent barley flour