These extracts are not well defined. Even yeast extract may vary between producers as they use different yeast species to grow biomass and use different techniques to destroy yeast cells.
Hi there,
As Andrey said, these are complex media which result from cell digest so their exact composition can't be defined. This is the main problem with these complex rich media. If you want to control media's composition you should opt for minimal supplemented media.
For rather simple needs a combination of YNB (yeast nitrogen base) and YCB (yeast carbon base) with particular carbon and nitrogen sources can be used to produce chemically defined media.
Yeast extract is the common name for yeast products made by extracting the cell contents (removing the cell walls); they are used as food additives or flavorings, or as nutrients for bacterial culture media. They are often used to create savory flavors and umami taste sensations, and can be found in a large variety of packaged food including frozen meals, crackers, snack foods, gravy, stock and more. Yeast extracts in liquid form can be dried to a light paste or a dry powder.
regards
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