Process for reducing the activity of microbial contamination in a yeast medium
AssigneeDanstar Ferment AG
InventorsJeffery R. Broadbent, James L. Steele, Brooks Henningsen, Ekkarat Phrommao, Fernanda Cristina Firmino
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Abstract
The present disclosure provides an antimicrobial composition as well as a process using same to limit microbial activity in a yeast medium. The antimicrobial composition includes at least one weak acid, optionally in combination with an acid stable bacteriocin and/or an antibiotic. The antimicrobial composition can be used for propagating yeasts and for making a fermentation product. The present disclosure also provides yeasts and lactic acid bacteria that can be used with the antimicrobial composition.
Claims29
A process for making a medium for a yeast, the process comprising:
- (i) adjusting the pH of a raw medium with a strong acid to provide an acidified medium;
- and
- (ii) maintaining the acidified medium at the adjusted pH for a period of time;
- wherein
- the process comprises adding an antimicrobial composition to the:
- raw medium prior to or during step (i), and/or
- acidified medium prior to or during step (ii);
- the antimicrobial composition comprising at least one weak acid, optionally in combination with an acid stable bacteriocin and/or an antibiotic;
- step (i) comprises adjusting the pH of the raw medium below or equal the pKa of the at least one weak acid of the antimicrobial composition;
- step (ii) comprises maintaining the acidified medium so as to decrease the contaminating microbial activity in the acidified medium, when compared to a corresponding control medium not previously treated with the antimicrobial composition;
- and
- the medium comprises a biomass.
An antimicrobial composition comprising at least one weak acid.
Dependencies are inferred from the claim text.