Table 1.
Compositions of hydrolyzates used in cultivations a
| Component b | AFEX-pretreated corn stover hydrolyzate | Dilute acid-pretreated switch grass hydrolyzates (20% solids) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6% Glucan | 12% Glucan | PSGHL | SGH | SGH-N1 | SGH-N2 | |||||||
| Mean | s | Mean | s | Mean | s | Mean | s | Mean | s | Mean | s | |
| Glucose (g/L) | 58.9 | 9.0 | 107.4 | 16.7 | 7.9 | 2.5 | 69.2 | 3.2 | 67.4 | 6.5 | 64.2 | 1.3 |
| Xylose (g/L) | 34.2 | 7.3 | 48.7 | 15.8 | 52.1 | 5.1 | 48.6 | 2.7 | 45.3 | 3.5 | 47.4 | 0.8 |
| Arabinose (g/L) | 4.3 | 0.6 | 9.5 | 0.4 | 7.6 | 0.9 | 6.1 | 0.3 | 4.4 | 0.7 | 7.6 | 0.2 |
| Galactose (g/L) | 3.1 | 0.3 | 5.7 | 0.6 | 3.0 | 0.7 | 5.2 | 0.3 | 5.2 | 0.3 | 5.2 | 0.3 |
| Fructose (g/L) | 4.0 | 1.7 | 8.2 | 3.0 | 0.9 | 0.4 | 0.7 | 0 | 0.7 | 0 | 0.7 | 0 |
| Mannose (g/L) | 1.0 | 0.1 | 2.0 | 0.2 | 8.9 | 5.1 | 0 | 0 | 0 | 0 | 0 | 0 |
| Acetic acid (g/L) | 1.8 | 0.2 | 4.7 | 1.0 | 6.1 | 2.8 | 5.4 | 0.4 | 4.3 | 0.6 | 5.8 | 0.3 |
| HMF (mM) | 0.3 | 0.5 | 1.1 | 1.5 | 2.8 | 3.1 | 1.8 | 0.2 | 1.1 | 1.3 | 3.6 | 0.5 |
| Furfural (mM) | 0.2 | 0.1 | 0.4 | 0.0 | 24.4 | 7.6 | 18.3 | 4.5 | 24.5 | 4.5 | 19.1 | 0.8 |
| PAN (mg N/L) | 318.7 | 49.9 | 493.2 | 69.1 | 33.7 | 15.6 | 69.9 | 14.7 | 188.0 | 4.0 | 173.0 | 22.0 |
| Urea (mg N/L) | 83.1 | 29.3 | 105.5 | 9.1 | 0.7 | 0.7 | 7.0 | 2.7 | 1101.0 | --c | 962.0 | 105.0 |
| Ammonia (mg N/L) | 1,193.4 | 289.7 | 2,707.6 | 385.6 | 25.0 | 21.0 | 23.0 | 24.6 | 369.0 | 63.0 | ||
aValues are reported in terms of mean and standard deviation(s) across hydrolyzates used in experiments reported.
bAbbreviations: HMF = hydroxymethylfurfural; PAN = primary amino nitrogen; PSGHL = dilute acid pretreated switchgrass hydrolyzate liquor; SGH = switchgrass hydrolyzate; or with nutrient supplements -N1 or -N2, as described in ‘Methods’ section.
cNo values of s since N content was calculated based on urea addition.