Yeast extract granulated is manufactured from selected strains of Saccharomyces cerevisiae. It is manufactured under controlled conditions to retain its vitamin content and other nutritive values, such as peptides, free amino acids, nucleic acids, minerals, trace elements, and phosphorous compounds. It is rich in vitamins and is often used to supply these factors in culture media at a concentration of 0.3 - 0.5%. Yeast extract provides a complete source of nutrients for microorganisms and is particularly useful for the cultivation of fastidious bacteria that require specific nutrients or additional growth factors. It can be used alone or in combination with other sources of nutrients, such as peptones or salts.

Appearance (colour)brownish-yellowAppearance (description)granulesIdentityconformspH-value (2%; water)5.5 - 7.2N (Nitrogen) (calculated on dried substance)≥ 10.5%Sulfated ash (600 °C)≤ 17.0%Heavy metals (as Pb)≤ 0.005%Loss on drying (50 °C; <670 Pa; 3 h)≤ 5.0%Ca (Calcium)≤ 0.05%Mg (Magnesium)≤ 0.10%Chloride (Cl) (as NaCl)≤ 5.0%Phosphorous compounds (as P)≤ 2.5%Suitability for microbiologypasses test.