Yeast-Soy Complex Peptone SP
By delivering a prolonged release of highly bioavailable nitrogen alongside native yeast-derived trace minerals, B-complex vitamins, and nucleic acid precursors, this specialized blend fuels sustained biomass and mycelial development during the critical vegetative phase of Streptomyces cultivation while simultaneously optimizing metabolic pathways to significantly boost the yield of high-value secondary metabolites, antibiotics, and target enzymes.
- Category
- Peptones & Protein Hydrolysates
- Pack sizes
- 500 g · 5 kg · 25 kg
- Raw material
- Soy
- Certifications
- ISO 22000 · Non-GMO · Animal-free
Data updated：2026-11-06
- Allergens
- Soy, Gluten
Overview
Yeast-Soy Complex Peptone SP is a beige, animal-free nutrient powder featuring a synergistic blend of enzymatically hydrolyzed soy and yeast proteins. Designed specifically for high-performance microbial fermentation, it optimizes Streptomyces growth and enhances secondary metabolite production.
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
- Food-grade raw materials, produced in an ISO 22000 certified facility
- Non-GMO, Animal-origin-free (AOF)
- 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
Food grade versus laboratory grade
Most culture media suppliers use laboratory-grade raw materials, which are held to lower standards for heavy metal residues, microbial contamination control, and traceability. That is adequate for pure research but not for applications with stricter raw-material requirements. STBIO manufactures with food-grade raw materials throughout, in a facility certified to ISO 22000 food safety management.
- Food microbiology laboratories working to ISO 17025 or equivalent requirements
- Biotech manufacturers exporting fermentation products and needing full raw-material traceability
- Organisations with ESG or compliance audit requirements across their supply chain
- Companies sourcing both Halal and non-Halal products who need one consistent material grade
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.
03Is it free of animal-derived components?
Yes. This product is animal-origin-free, suitable for animal-free formulations and Halal requirements; a declaration is available on request.
04Is the raw material non-GMO?
Yes. The raw material is non-GMO; the supplier declaration can be provided with the COA.
05Can it be used for food-grade applications?
Yes. It is made from food-grade raw materials in an ISO 22000 certified facility and is suitable for culturing starters for fermented products that are consumed directly.
06How 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
- Soy milk keeps contaminating your fermenter? Replace it with soy peptone and ISPA stable, sterile, traceable plant nitrogen source in place of in-house soy milk
- Cost-Effective Industrial & Food Fermentation Nutrient SeriesEconomical, nutritionally balanced and consistent nitrogen sources that lower medium costs in large-scale industrial and food fermentation. For food and beverage fermentation, biopesticides, biofertilizers, environmental microorganisms and industrial enzymes.
- High Spore Yield Nutrient SeriesNutrient formulations designed for the growth and sporulation of spore-forming bacteria, improving spore yield, sporulation rate and product quality. For Bacillus subtilis, B. amyloliquefaciens, B. velezensis and other biopesticide and biofertilizer strains.