Yeast extract is a food additive made from the cell contents of yeast without the cell walls, produced mainly by autolysis, a process in which yeast cells are heated until they rupture so their own enzymes break their proteins into amino acids and peptides. It is valued for a savory, umami taste from its glutamic acid content and is used in frozen meals, crackers, gravies and stocks, and in spread products such as Marmite, first sold in Britain in 1902, and Vegemite, sold in Australia since 1922.
Facts
Earliest Documented Use, From (Year) Sources
1. Yeast extract (Wikipedia)
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The thermal process to make yeast extract of the autolysate type was invented in the 19th century by Justus von Liebig.
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