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| Content Provider | Springer Nature Link |
|---|---|
| Author | Verbelen, Pieter J. Dekoninck, Tinne M. L. Mulders, Sebastiaan E. Saerens, Sofie M. G. Delvaux, Filip Delvaux, Freddy R. |
| Copyright Year | 2009 |
| Abstract | The volumetric productivity of the beer fermentation process can be increased by using a higher pitching rate (i.e. higher inoculum size). However, the decreased yeast net growth observed in these high cell density brewery fermentations can adversely affect the physiological stability throughout subsequent yeast generations. Therefore, different O2 conditions (wort aeration and yeast preoxygenation) were applied to high cell density fermentation and eight generations of fermentations were evaluated together with conventional fermentations. Freshly propagated high cell density populations adapted faster to the fermentative conditions than normal cell density populations. Preoxygenating the yeast was essential for the yeast physiological and beer flavor compound stability of high cell density fermentations during serial repitching. In contrast, the use of non-preoxygenated yeast resulted in inadequate growth which caused (1) insufficient yield of biomass to repitch all eight generations, (2) a 10% decrease in viability, (3) a moderate increase of yeast age, (4) and a dramatic increase of the unwanted flavor compounds acetaldehyde and total diacetyl during the sequence of fermentations. Therefore, to achieve sustainable high cell density fermentations throughout the economical valuable process of serial repitching, adequate yeast growth is essential. |
| Starting Page | 1729 |
| Ending Page | 1737 |
| Page Count | 9 |
| File Format | |
| ISSN | 01415492 |
| Journal | Biotechnology Letters |
| Volume Number | 31 |
| Issue Number | 11 |
| e-ISSN | 15736776 |
| Language | English |
| Publisher | Springer Netherlands |
| Publisher Date | 2009-06-30 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Brewer’s yeast Fermentation Flavor compounds Saccharomyces cerevisiae Yeast physiology Yeast aging Biochemistry Applied Microbiology Biotechnology Microbiology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine Bioengineering Applied Microbiology and Biotechnology Biotechnology |
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