Influence of stressful fermentation conditions on neutral lipids of a Saccharomyces cerevisiae brewing strain (CROSBI ID 167100)
Prilog u časopisu | kratko priopćenje | međunarodna recenzija
Podaci o odgovornosti
Rupčić, Jasminka ; Čanadi Jurešić, Gordana
engleski
Influence of stressful fermentation conditions on neutral lipids of a Saccharomyces cerevisiae brewing strain
The neutral lipid fraction of the aerobically grown starter yeast culture of a Saccharomyces cerevisiae brewing strain, and three-first recycled yeast generations exposed to multiple stress factors during beer fermentation was studied. No pronounced changes in the cellular neutral lipid content between the non-stressed starter and stressed recycled cells were found. However, it was found that recycled yeast generations modulate their neutral lipid composition during fermentation. The ergosterol content was increased at the expense of steryl esters (SEs) and squalene, which resulted in a higher ergosterol/SEs molar ratio and a slightly higher ergosterol/squalene molar ratio. In addition, the proportion of unsaturated fatty acids, mainly palmitoleic acid increased in the neutral lipid fraction of the stressed recycled yeast generations. These results suggest that some specific neutral lipid species and fatty acids stored in the neutral lipid fraction are involved in the adaptive response of the brewer's yeast to stressful fermentation conditions. The striking finding was a high squalene content in the neutral lipid fraction of both the starter yeast culture and recycled yeast generations (22.4 vs. 19-20%, respectively), implying a possible biotechnological exploitation of this biologically active molecule from the yeast biomass.
Brewer's yeast ; Saccharomyces cerevisiae ; neutral lipids ; ergosterol ; squalene ; fatty acids
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Podaci o izdanju
26 (7)
2010.
1331-1336
objavljeno
0959-3993
1573-0972
10.1007/s11274-009-0297-7