Purified and cultivated baker's yeast is used as a raw material, and it is a paste product obtained by autolysing enzymatic hydrolysis, centrifugal separation, and three-effect vacuum concentration
Yeast extract is produced by various yeast species mainly by Saccharomyces cerevisiae or baker’s yeast. In addition to its use as a supplement in culture media for microbial research and biotechnology, yeast extract is also used as a component of the complex media for industrial fermentations.It also serves as a nutritional source for various microbial media.
Description
Light yellow paste, easily soluble in water;
Rich in free amino acids, peptides, B vitamins, nucleotides, trace elements, etc.
Application
For general bacteriological use with a variety of microorganisms.
Yeast Extract has been used as a component of:
complex media for culturing E. coli clones for shake flask experiments
culture media for culturing bacterial species Gluconacetobacter xylinus
yeast extract beef (YEB) media for the transformation of Agrobacterium
Yeast extract is used as a bacteriological media component for a variety of microorganisms and molecular genetics applications.
Physical-chemical characteristics
Test items | index |
Solubility (% ,normal temperature) | 2% completely dissolved |
pH (2% solution) | 4.0-7.2 |
Moisture (%) | ≤35.0 |
Total nitrogen (%) | ≥10.0 |
Amino nitrogen (%) | ≥4 .0 |
Ash content (%) | ≤15.0 |
NaCl (%) | ≤2.0 |
Microbiology
Test items
| index
|
Total number of colonies（cfu/g） | ≤50000 |
Coliform group（MPN/g） | ≤0.3 |
Yeast（cfu/g） | ≤10.0 |
Mold（cfu/g） | ≤10.0 |
Salmonella，/25g | Not check out
|
Shigella，/25g | Not check out
|
Staphylococcus aureus，/25g | Not check out
|
Heavy metals
Test items
| index
|
Total arsenic（ppm） | ≤0.5 |
Lead（ppm） | ≤1.0 |
Mercury（ppm） | ≤0.5 |
Amino acid composition
Types of amino acids | | Free amino acid ( % ) | Hydrolyzed amino acid ( % ) |
Aspartic acid | Asp | 1.0 | 1.99 |
Threonine | Thr | 0.7 | 2.04 |
Serine | Ser | 2.1 | 7.43 |
Glutamate | Glu | 0.5 | 1.98 |
Glycine | Gly | 2.9 | 4.45 |
Alanine | Ala | 1.3 | 0.52 |
Cysteine | Cys | 1.5 | 2.45 |
Valine | Val | 0.8 | 0.79 |
Methionine | Met | 1.0 | 2.06 |
Isoleucine | Ile | 0.9 | 4.51 |
Leucine | Leu | 1.4 | 3.06 |
Tyrosine | Tyr | 0.7 | 1.46 |
Phenylalanine | Phe | 0.9 | 1.24 |
Lysine | Lys | 0.9 | 3.24 |
Histidine | His | 0.2 | 0.88 |
Arginine | Arg | 1.1 | 2.47 |
Proline | Pro | 0.6 | 1.76 |
total | | 18.5 | 42.33 |
ps :The above indicators are for reference only, the specific values are subject to the actual measurement of each batch
L2505530