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A loaf of bread baked with Carl Griffith's sourdough starter sits on a board. Carl Griffith's sourdough starter, also known as the Oregon Trail Sourdough or Carl's starter, is a sourdough culture, a colony of wild yeast and bacteria cultivated in a mixture of flour and water for use as leavening. [1]
A sourdough starter is “live fermented culture of fresh flour and water,” according to The Clever Carrot. Once the two ingredients are mixed together, the mix ferments and creates a natural yeast.
Sourdough or sourdough bread is a bread made by allowing the dough to ferment using naturally occurring lactobacillaceae and yeast before baking. The fermentation process produces lactic acid , which gives the bread a sour taste and improves its keeping-qualities.
Sourdough starters are leavened by a mixture of yeast and lactobacilli in a ratio of about 1:100. The yeast is most commonly Kasachstania humilis (formerly Candida humilis or C. milleri). This yeast cannot metabolize the maltose found in the dough, while the Fructilactobacillus requires maltose. [7]
Sourdough breads are made with a sourdough starter. The starter cultivates yeast and lactobacilli in a mixture of flour and water, making use of the microorganisms already present on flour; it does not need any added yeast. A starter may be maintained indefinitely by regular additions of flour and water.
In this usage, synonyms for sponge are yeast starter or yeast pre-ferment. [3] [note 1] In French baking the sponge and dough method is known as levain-levure. [4] The method is reminiscent of the sourdough or levain methods; however, the sponge is made from all fresh ingredients prior to being used in the final dough. [5] [note 2]