What’s the reaction?

When water mixes with the acid (often MCP, SAPP, SALP, SAS or tartaric acid—although phosphate-free varieties are available), carbon dioxide gas is released. This aerates the dough or batter, creating a fine grain and quality texture.  Just keep in mind that baking powder will impact the final product’s pH.

Baking powder is classified by it’s reaction rate:

• Fast-acting: releases most of its potential gas volume during the first few minutes of contact with liquid, imposing the need for fairly rapid processing of the dough or batter to avoid excessive volume loss.
• Slow-acting: releases almost none of its gas volume at low temperatures and requires oven heat to achieve complete reaction.
• Double-acting: reacts partially at low temperatures to form smooth-flowing batters, but typically requires high temperatures for complete reaction.

Double-acting is more common and means that the baking powder contains a combination of leavening acids that will release gas during the mixing and again during baking.

There are a variety of baking powders on the market, allowing for use in a wide range of applications. Things to consider when choosing a baking powder are reaction time, single- vs. double-acting in relation to the processing time, and baking temperature/time for the product.