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Facts about Raising Agents. Raising agents work by incorporating a gas into a mixture. When you heat the gas it expands and then it rises. So the mixture has alight open texture. Raising agents maybe added by mechanical means such as sieving.

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facts about raising agents
Facts about Raising Agents
  • Raising agents work by incorporating a gas into a mixture.
  • When you heat the gas it expands and then it rises. So the mixture has alight open texture.
  • Raising agents maybe added by mechanical means such as sieving.
  • Can be included in the ingredients such as yeast and bicarbonate of soda.
  • Raising agents can be natural and chemical.
natural raising agents
Natural raising agents.
  • The three gases which make products light are
  • air,
  • Steam,
  • carbon dioxide
  • In most mixtures you use more than one raising agent.
  • So in a cake it would be self raising flour but air would also be trapped when creaming.
slide3
Air
  • Air is added mechanically to food when you are
  • Whisking
  • Sieving
  • Creaming
  • Beating
  • Rubbing in
  • Rolling and folding
steam
Steam
  • Steam is a raising agent when a mixture has a high proportion of liquid which is then cooked at a high temperature .
  • As the water is then turned into steam.

Such as

  • Yorkshire puddings
  • Choux pastry
  • Flaky and rough puff pastry.
carbon dioxide
Carbon Dioxide
  • Carbon dioxide is used as a raising agent when
  • A biological raising agent like yeast is used.
  • Or a chemical raising agent like bicarbonate of soda is used.
biological raising agents
Biological Raising agents
  • Yeast is a micro-organism.
  • When it reproduces it gives off carbon dioxide gas.
the following conditions are needed for reproduction
The following conditions are needed for reproduction.
  • Warmth between

(25 and 28C) At low temperatures it slows down and at high temperatures it is killed.

  • Liquid
the following conditions are needed for reproduction8
The following conditions are needed for reproduction.

Food

  • Sugar added to the mixture or obtained from flour

Time

  • The mixture must be covered and left to rise in a warm place.
chemical raising a gents
Chemical Raising Agents
  • Chemical raising agents produce carbon dioxide when they are heated with a liquid.
  • Self raising flour is very convenient as the raising agent is already added.
  • Bicarbonate of soda produces carbon dioxide and washing soda when heated. The washing soda is hidden by the flavours added to the cakes.
  • Bicarbonate of soda plus acid, such as soured milk used in scones. The acid prevents the washing soda being made.
  • Baking powder is a convenient mixture of bicarbonate of soda and an acid.