Table 2 Xylose and arabinose consumption rates and product yields from anaerobic batch fermentations by strains BWY02.XA (xylose and arabinose-growing laboratory strain), TMB 3400 (xylose-growing industrial strain) and TMB 3063 (xylose and arabinose-growing industrial strain). Defined mineral medium with mixtures of 20 g/l glucose and 20 g/l xylose or 20 g/l glucose and 20 g/l arabinose as well as 20 g/l glucose, 20 g/l xylose and 20 g/l arabinose were used as indicated. Product yields are calculated from the pentose phase of the fermentation. (n.a. not applicable; n.d. not detected)
Substrate | Strain | qxylose (g xylose h-1 g cells-1) | qarabinose (g arabinose h-1 g cells-1) | Yarabitol (g arabitol g arabinose-1) | Yxylitol (g xylitol g xylose-1) | Yglycerol (g glycerol g pentose-1) | Yacetate (g acetate g pentose-1) | Yethanol (g ethanol g pentose-1) | final ethanol concentration (g l-1) |
|---|---|---|---|---|---|---|---|---|---|
Glucose + xylose | BWY02.XA | 0.1 ± 0.0 | n.a. | n.a. | 0.34 ± 0.01 | 0.12 ± 0.01 | 0.02 ± 0.00 | 0.23 ± 0.01 | 14.2 ± 0.7 |
Glucose + arabinose | BWY02.XA | n.a. | 0.03 ± 0.00 | 0.77 ± 0.22 | n.a. | 0.00 ± 0.02 | 0.10 ± 0.04 | n.d. | 9.0 ± 2.0 |
Glucose + xylose + arabinose | BWY02.XA | 0.041 ± 0.080 | 0.035 ± 0.014 | 1.14 ± 0.18 | 0.33 ± 0.03 | n.d. | n.d. | 0.07 ± 0.1 | 10.4 ± 2.2 |
TMB 3400 | 0.066 ± 0.015 | 0.01 ± 0.00 | approx. 1* | 0.42 ± 0.00 | 0.01 ± 0.00 | n.d. | 0.09 ± 0.0 | 12.8 ± 0.5 | |
TMB 3063 | 0.042 ± 0.002 | 0.029 ± 0.002 | 0.68 ± 0.17 | 0.11 ± 0.03 | 0.03 ± 0.00 | 0.06 ± 0.01 | 0.16 ± 0.03 | 14.7 ± 2.0 |