Yeast Extract: Uses, Applications & Buying Guide for Canadian Labs and Manufacturers
Yeast extract is a water-soluble mixture of amino acids, peptides, vitamins, and carbohydrates derived from autolyzed yeast cells — one of the richest, most widely used nutrient sources in microbiological culture media. Third Space Bio supplies yeast extract at practical prices, so fastidious organisms and demanding fermentation protocols aren't limited by what's left in the jar.
At a glance
| CAS Number | 8013-01-2 (generic reference; yeast extract is a complex mixture, not a single compound) |
|---|---|
| Composition | Amino acids, peptides, water-soluble vitamins, carbohydrates |
| Common name | Yeast extract, YE |
| Pack sizes | 250 g ($31), 500 g ($52), 1 kg ($88) |
| Ships from | Peterborough, ON — Canada-wide delivery |
Applications
Culture media for fastidious organisms
Yeast extract's rich, undefined nutrient profile makes it well suited to cultivating organisms that need more than a minimal, defined medium can provide — it supplies growth factors that many microbes can't synthesize on their own.
Fermentation research
As a nutrient supplement, yeast extract shows up in a wide range of fermentation protocols, supporting robust growth and metabolic activity in both bacterial and yeast-based systems.
Microbiological studies
Its consistency and broad nutrient base make it a standard inclusion in general-purpose laboratory media used across teaching and research microbiology.
Where it fits for food, pharma & research buyers
Yeast extract's primary buyer is the research and university segment — it's a near-universal reorder item for any lab running microbiological media. As a compound, it also has a home-brewing and craft fermentation audience, where it's used as a wort nutrient — a modest secondary market alongside the core lab and university list, though Third Space Bio's product is supplied for laboratory use rather than a certified food-grade standard.
Yeast extract vs. peptone
| Ingredient | Source | Typical use case |
|---|---|---|
| Yeast extract | Autolyzed yeast cells | Rich in B-vitamins and amino acids; often paired with peptone |
| Peptone | Enzymatic or acid digestion of animal or plant protein | Primarily an amino acid/peptide source; lower vitamin content than yeast extract |
| Tryptone | Enzymatic digestion of casein | Similar role to peptone, often used together with yeast extract in standard media (e.g. LB broth) |
Most general-purpose microbiological media combine yeast extract with a peptone or tryptone source — yeast extract supplies the vitamins and micronutrients that peptone alone lacks, which is why the two are so often listed together in a recipe.
Frequently asked questions
As a nutrient-rich additive in culture media, supplying amino acids, peptides, vitamins, and carbohydrates that support the growth of a wide range of microorganisms, including fastidious species.
No — nutritional yeast is a food product made from deactivated yeast, typically in flake form. Laboratory-grade yeast extract is a purified, standardized ingredient formulated specifically for culture media use.
Yeast extract provides B-vitamins and micronutrients that peptone doesn't, while peptone contributes amino acids and peptides — together they cover a broader nutritional base than either alone.
Yes — in 250 g, 500 g, and 1 kg packs, with calculated Canada Post shipping at checkout.
See also: Reagents for Labs & Universities and Reagents for Craft & Hobbyist Fermentation Projects.
Browse pack sizes and order Yeast Extract directly — part of Third Space Bio's mission to make reliable reagents accessible, not a bottleneck, for Canadian research and innovation.
