The ethanol tolerance of Pachysolen tannophilus in fermentation on xylose.
The influence of ethanol on fermentation by Pachysolen tannophilus was studied. When xylose utilization rate was 80%, ethanol concentration began to decline. Fermentation of P. tannophilus was affected by ethanol addition in the beginning of fermentation; average xylose consumption rate was 0.065 g.l(-1).h(-1), and maximum specific growth rate was 0.07 h(-1) at 28 g.l(-1) ethanol, comparing with the average xylose consumption rate of 0.38 g.l(-1).h(-1) and maximum specific growth rate of 0.14 h(-1) in fermentation with no ethanol addition; P. tannophilus stopped growth at 40 g.l(-1) ethanol. When the initial ethanol concentration was 30 g.l(-1), the addition of glucose in xylose media made the growth of P. tannophilus better, and the most favorable glucose concentration was 15 g.l(-1) with the highest biomass of 1.51 g.l(-1) as compared with that of 0.95 g.l(-1) in pure xylose media.
Zhao
Lei
L
Beijing University of Chemical Technology, China.
Yu
Jianliang
J
Zhang
Xu
X
Tan
Tianwei
T
D018533:Biomass; D000431:Ethanol / Q000737:chemistry / Q000378:metabolism*; D005285:Fermentation; D005947:Glucose / Q000378:metabolism; D007700:Kinetics; D004718:Saccharomycetales / Q000737:chemistry / Q000378:metabolism*; D014994:Xylose / Q000737:chemistry / Q000378:metabolism*
D000431:Ethanol; D014994:Xylose; D005947:Glucose