Table 1 Conversion of substrates to lactic acid by Caldicellulosiruptor BluCon L60
From: Direct conversion of cellulose to l-lactic acid by a novel thermophilic Caldicellulosiruptor strain
Substrate | Substrate concentration in the culture | Lactic acid produced | Lactic acid ratio in fermentation products | Lactic acid yield. C5/C6-sugars conversion to lactic acid | LAE yield. C5/C6-sugars conversion to lactate + acetate + ethanol |
|---|---|---|---|---|---|
| Â | g (dry) / liter culture | g/l | wt% | % of maximum | % of maximum |
Microcrystalline cellulose Avicel | 18.3 | 16.8 ± 0.5 | 92.4 ± 0.4 | 85.7 ± 2.7 | 96.9 ± 2.9 |
|  | 27.4 | 24.6 ± 0,2 | 93.0 ± 0.2 | 83.7 ± 0.6 | 93.6 ± 0.5 |
Microcrystalline cellulose Jelucel OF30 | 18.0 | 16.6 ± 0.2 | 92.6 ± 0.2 | 85.1 ± 0.9 | 95.6 ± 1.2 |
|  | 27.0 | 23.3 ± 0.3 | 93.5 ± 0.0 | 79.9 ± 1.1 | 88.5 ± 1.3 |
Filter paper (Whatman #1) | 18.5 | 17.1 ± 0.2 | 92.9 ± 0.1 | 87.1 ± 1.0 | 97.6 ± 1.0 |
|  | 27.8 | 24.5 ± 0.2 | 92.9 ± 0.2 | 83.2 ± 0.8 | 93.1 ± 0.8 |
Newspaper | 18.4 | 8.1 ± 0,1 | 89.9 ± 0.2 | 58.9 ± 0.8 | 69.2 ± 1.1 |
|  | 27.6 | 10.9 ± 1.0 | 87.8 ± 4.5 | 52.6 ± 5.1 | 64.4 ± 1.5 |
Cardboard (brown) | 18.3 | 9.3 ± 0.4 | 88.4 ± 0.1 | 62.3 ± 3.0 | 75.1 ± 3.7 |
|  | 27.4 | 10.4 ± 0.7 | 87.6 ± 0.5 | 46.5 ± 3.0 | 56.7 ± 3.4 |
Recycled paper | 18.3 | 8.3 ± 0.2 | 89.0 ± 0.3 | 63.2 ± 1.1 | 75.4 ± 1.2 |
|  | 27.4 | 11.9 ± 0.3 | 90.1 ± 0.2 | 60.3 ± 1.4 | 70.7 ± 1.6 |
Xylan from beechwood | 18.1 | 13.6 ± 0.9 | 88.5 ± 0.2 | 73.1 ± 4.6 | 88.7 ± 5.6 |
|  | 27.2 | 18.7 ± 0.6 | 89.1 ± 0.6 | 67.2 ± 2.0 | 80.6 ± 3.2 |
Starch (soluble) | 17.2 | 14.4 ± 0.9 | 91.2 ± 0.6 | 75.1 ± 4.7 | 86.6 ± 5.7 |
|  | 25.9 | 23.2 ± 0.3 | 93.0 ± 0.3 | 80.9 ± 0.9 | 90.4 ± 0.8 |
Wheat straw (not pretreated) | 18.1 | 3.1 ± 0.2 | 75.2 ± 1.0 | 26.3 ± 1.8 | 39.6 ± 2.0 |
|  | 27.1 | 4.4 ± 0.1 | 77.7 ± 0.1 | 24.3 ± 0.6 | 35.0 ± 0.8 |
Wheat straw (6% NaOH-refiner) | 21.4 | 8.8 ± 0.6 | 79.4 ± 4.7 | 49.3 ± 3.5 | 71.0 ± 1.3 |