Yeast Extract | premium grade | 250g
- Product Code: GMNB-YE100
- Availability: In Stock
Yeast Extract, Premium Grade
This extract is derived from high-protein bread yeast (baker’s yeast, Saccharomyces cerevisiae), cultured on a starch-based medium. Compared to wine or beer yeast, bread yeast contains significantly lower levels of pigments - specifically plant-derived tannic acids—which are known to inhibit bacterial growth. This reduction supports improved culturing consistency and yield.
The yeast undergoes autolysis, pasteurisation, concentration, and vacuum powdering, followed by full enzymatic digestion of cellular components. Avoidance of prolonged heat treatment ensures maximal preservation of heat-sensitive nutrients.
The resulting extract delivers superior protein nitrogen content (>5%) predominantly as free amino acids and balanced micronutrients, surpassing the ~4% typically found in conventional yeast extracts. This optimised nutrient profile makes it particularly suitable for refined and sensitive cell culture systems requiring high bioavailability and minimal metabolic interference.
Properties
Total nitrogen (N) basis ≥ 10.0%
Amino-nitrogen basis ≥ 5.0%
Residue on ignition ≤15.0%
Loss on drying ≤6.0%
Sodium chloride ≤2.0%
pH (2% in H2O) 5.3~7.2
Heavy metal content
Lead <1.9mg/kg
Arsenic <2mg/kg
Microbiological indicators
Total number of bacterial colonies <10kCFU/g
Escherichia coli 0.3MPN/g
Salmonella enterica Not detected
Staphylococcus aureus Not detected
Form
Powder, yellow to light yellow
Solubility
H2O: 10%, clear, yellow
From May 2023, GMExpression no longer sells Regular Yeast Extract, which has been replaced by Yeast Extract premium grade at the same price. Please contact our customer service if you have any special requirements for regular yeast extract (industrial bulk still available).
FAQ
Compare Different Grades of Yeast Extract products:
| Yeast Powder – Industrial Grade | Yeast Extract – Economic Grade (Industrial Grade) | Yeast Extract – Standard Grade | Yeast Extract – Premium Grade | |
| Source | Lager beer yeast (fewer wild bacteria) | High-protein bread yeast cultured on starch solid media | High-protein bread yeast cultured on starch solid media | High-protein bread yeast cultured on starch solid media |
| Characteristics | Non-autolysed; retains essential vitamins and trace elements | Reduced plant-derived pigment (tannic acid) | Elevated peptide content | Minimal heat treatment preserves biotin, riboflavin, and other temperature-sensitive molecules |
| Total nitrogen | ≥ 7.5 % | ≥ 9.0 % | ≥ 10.0 % | ≥ 10.0 % |
| Amino-nitrogen | ≥ 2.5 % | ≥ 2.5 % | ≥ 4.0 % | ≥ 5.0 % |
| Solubility | < 2 % | < 2 % | 2 % | 10 % |
| Applications | Feeding fruit flies or laboratory animals | Affordable protein-scale expression and general microbial culturing | Routine lab assays and bacterial culturing requiring high yield | Clinical diagnostics, pharmaceutical research, and high-precision experiments |
| Pricing | AUD 450.00 - 10 kg | AUD 575.00 - 10 kg | AUD 780.00 - 10 kg | AUD 995.00 - 10 kg |
| Availability | Pre-order; 6–8 weeks lead time | Pre-order; 6–8 weeks lead time | Pre-order; 6–8 weeks lead time | Pre-order; 6–8 weeks lead time |
Yeast Cold Extract Lysate – High-End Formulation
- Characteristics: Retains active intracellular enzymes and maintains the medium’s redox micro-environment
- Applications: Demanding protein/molecule expression workflows for fastidious organisms
