Table 2.

Comparison of xylose fermentation by Pichia stipitis CBS 5773 and CBS 6054 under microaerobic reaction conditions using an elevated substrate concentration of 76 g/L

	CBS 5773	CBS 6054
μmax (1/h)	0.007 ± 0.001	0.006 ± 0.002
qxylose (g/g CDW/h)1	0.18 ± 0.004	0.15 ± 0.015
Yethanol (g/g)2	0.37 ± 0.001	0.39 ± 0.005
Yxylitol (g/g)2	0.127 ± 0.023	0.118 ± 0.011
Yglycerol (g/g)2	0.008 ± 0.001	0.011 ± 0.001
Yacetate (g/g)2	0.013 ± 0.001	0.015 ± 0.001
C-recovery (%)	89	93

^*Xylose uptake rates are snapshots after 22 h of fermentation. Cell dry weight was determined in duplicates after 0, 75, and 145 h.

†Yield coefficients are given in g/g xylose and were calculated from a dataset for which a linear relationship between metabolite production and xylose consumption was confirmed.