Yeast Extract 2G35
- Category
- Peptones & Protein Hydrolysates
- Pack sizes
- 500 g · 5 kg · 25 kg
- Raw material
- Yeast
- Certifications
- Halal
Data updated：2026-11-06
Overview
Yeast Extract 2G35 is a yeast-derived extract, used as a nitrogen and growth-factor source in culture media. It is suited to the cultivation of lactic acid bacteria and yeast. Supplied by STBIO MEDIA with a COA for every batch; samples and specifications are available on request. This is the Halal-certified version.
Yeast peptone, yeast extract or yeast peptide: how to choose
All three come from yeast and are animal-free; they differ in molecular size and composition. Yeast extract is the water-soluble fraction after autolysis, highest in free amino acids, B vitamins and nucleotides, and is used to supply growth factors. Yeast peptone is mainly short and medium peptides with a steadier nitrogen release, suited to fermentations that need nitrogen over a long run. Yeast peptides are smaller still and taken up quickly. Fastidious organisms such as lactic acid bacteria and bifidobacteria usually get both: peptone for nitrogen, extract for growth factors. Grades within a range differ in total nitrogen, amino nitrogen ratio, nucleotides and clarity in solution; see the specification sheets.
Product highlights
- Halal certified, suitable for the Malaysian, Indonesian, and Middle Eastern markets
- Available in 500 g / 5 kg / 25 kg, from laboratory to industrial scale
- COA, specification sheet, and technical data sheet available; samples on request
- Manufactured in Taiwan with reliable supply
Frequently asked questions
01Can yeast peptone replace beef or soy peptone?
In most fermentations it can replace them partly or fully, with the advantage of containing no animal components and no soy allergen, which suits Halal, vegetarian and animal-free formulations. Strains differ in their nitrogen preference, so trial 25%, 50% and 100% replacement and compare growth curves and product.
02How much yeast peptone should be added when a fermentation underperforms?
Start at 1 to 5 g per litre and adjust to the total nitrogen of the existing formulation. Yeast peptone is naturally rich in amino acids, B vitamins and nucleotides, so a small addition often fixes a slow start or a low cell count; too much can cause foaming and raise cost.
03Which organisms is it suitable for?
Lactic acid bacteria, Yeast. See the cultural response table and the specification sheet.
04How do I request a bulk quotation, and can you provide a COA?
Yes. This product is available in 500 g, 5 kg, 25 kg. Tell us your application and volume when requesting a quotation; we reply within one working day and can supply the COA, specification sheet, and technical data sheet.
Academic citation
Products from this range have been cited as the culture media source in a peer-reviewed study by a National Taiwan University research team:
Chan et al. (2024). Single-strain probiotics enhance growth, anti-pathogen immunity, and resistance to Nocardia seriolae in grey mullet (Mugil cephalus) via gut microbiota modulation. Animal Microbiome, 6, 67. Springer Nature.
Media attribution: Tryptone Soy Broth, MRS medium, LB broth, beef extract, peptone, yeast extract, agar (STBIO, New Taipei, Taiwan)
Read the full paperUsed in these applications
- Recombinant protein expression and plasmid production in E. coliLB, TB, and SOC ranges from transformation to high-density culture
- Fast-Growth & High-Efficiency Fermentation Nutrient SeriesRich in low-molecular-weight peptides, free amino acids, nucleotides and B vitamins to bring microorganisms into growth quickly, shortening fermentation time and raising line productivity.
- High Cell Density Fermentation Nutrient SeriesBalanced, efficient nutrients that support high-cell-density cultivation, increasing cell concentration, biomass and volumetric productivity. For E. coli, Bacillus and other industrial fermentation processes.