Optimization conditions of yeast extract production from Kluyveromyces lactis biomass.

Production of yeast extract from Kluyveromyces lactis biomass propagated on milk permeate basal medium was investigated. The best hydrolyzate was obtained upon using 1 M concentration of hydrochloric acid at 120° for 12 and 15 min. A yield about 96.6 and 97.8%, respectively was obtained. The resultant yeast extract encouraged growth of lactic acid bacteria when supplemented to a permeate basal medium to at least the same levels of growth as obtained using equivalent amount of commercial samples of yeast extract. The resultant yeast extract could be considered as a good supplement for production of some important dairy cultures