Agfdhyk

A leaven /ˈlɛvən/, often called a leavening agent /ˈlɛvənɪŋ/ (and also known as a raising agent), is any one of a number of substances used in doughs and batters that cause a foaming action (gas bubbles) that lightens and softens the mixture. An alternative or supplement to leavening agents is mechanical action by which air is incorporated. Leavening agents can be biological or synthetic chemical compounds. The gas produced is often carbon dioxide, or occasionally hydrogen.

When a dough or batter is mixed, the starch in the flour and the water in the dough form a matrix (often supported further by proteins like gluten or polysaccharides, such as pentosans or xanthan gum). Then the starch gelatinizes and sets, leaving gas bubbles that remain.

Biological leavening agents

• 
  Saccharomyces cerevisiae producing carbon dioxide found in:
  
  
  
  • baker's yeast
  
  
  • 
    beer (unpasteurised—live yeast)
  
  
  • ginger beer
  
  
  • kefir
  
  
  • sourdough starter
  
  
  
  


• 
  Clostridium perfringens producing hydrogen found in salt-rising bread
  

Chemical leavens

Chemical leavens are mixtures or compounds that release gases when they react with each other, with moisture, or with heat. Most are based on a combination of acid (usually a low molecular weight organic acid) and a salt of bicarbonate (HCO₃⁻). After they act, these compounds leave behind a chemical salt. Chemical leavens are used in quick breads and cakes, as well as cookies and numerous other applications where a long biological fermentation is impractical or undesirable.

History

Chemical leavening were publicized by Amelia Simmons in her American Cookery,^[1] published in 1796, wherein she mentions the use of pearl ash as a leavening agent.

Since chemical expertise is required to create a functional chemical leaven without producing off-flavors from the chemical precursors involved, such substances are often mixed into premeasured combinations for maximum results. These are generally referred to as baking powders. Sour milk and carbonates were used in the 1800s. The breakthrough in chemical leavening agents occurred in the 1930s with the introduction of monocalcium phosphates (Ca(H₂PO₄)₂). Other leavening agents developed include sodium aluminium sulfate (NaAl(SO₄)₂·12H₂O), disodium pyrophosphate (Na₂H₂P₂O₇), and sodium aluminium phosphates (NaH₁₄Al₃(PO₄)₈·4H₂O and Na₃H₁₅Al₂(PO₄)₈). These compounds combine with sodium bicarbonate to give carbon dioxide in a predictable manner.^[2]

Other leavens

Steam and air are used as leavening agents when they expand upon heating. To take advantage of this style of leavening, the baking must be done at high enough temperatures to flash the water to steam, with a batter that is capable of holding the steam in until set. This effect is typically used in popovers, Yorkshire puddings, and to a lesser extent in tempura.

Nitrous oxide is used as a propellant in aerosol whip cream cans. Large densities of N₂O are dissolved in cream at high pressure. When expelled from the can, the nitrous oxide escapes emulsion instantly, creating a temporary foam in the butterfat matrix of the cream.

Mechanical leavening

Creaming is the process of beating sugar crystals and solid fat (typically butter) together in a mixer. This integrates tiny air bubbles into the mixture, since the sugar crystals physically cut through the structure of the fat. Creamed mixtures are usually further leavened by a chemical leaven like baking soda. This is often used in cookies.

Using a whisk on certain liquids, notably cream or egg whites, can also create foams through mechanical action. This is the method employed in the making of sponge cakes, where an egg protein matrix produced by vigorous whipping provides almost all the structure of the finished product.

The Chorleywood Bread Process uses a mix of biological and mechanical leavening to produce bread; while it is considered by food processors to be an effective way to deal with the soft wheat flours characteristic of British Isles agriculture, it is controversial due to a perceived lack of quality in the final product. The process has nevertheless been adapted by industrial bakers in other parts of the world.

See also

• 
  Aerated Bread Company, bakeries started in 1862 in the UK that made carbon dioxide leavened bread


• Baking powder


• Chametz


• Passover


• Unleavened bread

References

Further reading

• Matz, S (1972). "Bakery Technology and Engineering", AVI Publishing Co.

External links

Wikisource has the text of the 1911 Encyclopædia Britannica article Leaven.

• 
  Wikibooks Cookbook has a recipe/module on Leavening agent