I know they are sources of vitamins and nitrogen, with a high amino acid composition. But I would like to know the difference in the macromolecular content between these components.
For example if peptone is more rich than the others in vitamins, and if the peptides from yeast extract have more extension than meat extract.
Thanks.
You can please follow the link below to obtain valuable informations:-
http://www.chaitanyagroups.com/bacteriological-media-ingredients.html
Meat Peptone, A fine, free flowing, slightly hygroscopic, spray dried powder containing amino acids, short chained peptides derived from enzymatic hydrolysis of high quality meat paste. it helps to maintain the growth of microbes in the culture. Protease Peptone, It is Fine, free flowing spray dried powder. Creamy yellow coloured powder used in fermentation & dehydrated media preparation as a nitrogen source. Gelatin Peptone, It is a fine, free flowing, slightly hygroscopic, and spray dried powder containing amino acids, short chained peptides derived from enzymatic digestion of high quality gelatin.
Yeast Extract Powder which is derived from an aqueous extract of automatized brewer's yeast. It is a rich source of vitamin content provides excellent growth conditions for more microbes. Added to culture media as a vitamin source .it is used in bacteriological media and fermentation industry as a vitamin & protein source. Fine, free flowing, slightly hygroscopic spray dried powder. Yellow to light brown colored powder.
Thanks Sandi and Yehia, but why is supposed that yeast or meat extract have more vitamin quantities that peptone?
Because essentially:
1) Meat Peptone: Derived from enzymatic hydrolysis of meat. Source of amino acids and short chained peptides .
2)Meat extract: Derived from enzymatic digestion of meat. Source of amino acids and short chained peptides (Usually known to be source of vitamins)
2)Yeast extract: Derived from an aqueous extract of brewer's yeast. Vitamin & protein source.
Why meat or yeast extract are richer in vitamins? I mean, because the meat have vitamins too. Maybe the hard preparation of peptona (from meat) deteriorates the vitamin content from meat. And the preparation of meat and yeast extract it's more delicated.
Meat extract is usually made from Beef and rarely lamb meat and it is a good source of lactose. Yeast extract is made from left over yeast from an ethanol fermentation (usually Saccharomyces cerevisiae) and it is a good source of vitamins and certain growth factors. It is rarely used as a carbon or nitrogen source in any microbiological medium. Peptone is nothing but partially digested protein (mostly of dairy origin) and it is used as a good source of nitrogen and some amino acids.
Dear Dr.
Meat extract is usually made from Beef and rarely lamb meat and it is a good source of lactose. Yeast extract is made from left over yeast from an ethanol fermentation (usually Saccharomyces cerevisiae) and it is a good source of vitamins and certain growth factors.
What is the source of lactose in beef extract. Can yeast extract be used for beef extract if not available as both mainly contains the peptides, amino acids and nucleotides apart from a bit of difference in vitamins and lactose.
Hi everyone,
I have a question, meat extract replace by yeast extract, isn't it?
How many content?
Yes, but meat extract has creatine, creatinine, and depending on the source meat used in meat extract there are differences in respect of the vitamin content (amounts etc). In respect of lactose content - meat extract has none that I know of however lactose broth does contain meat extract.
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