Table 1.
Parameters determined in the cultures with Pseudomonas putida EM42 resting cells and in the cultures with P. putida EM42 or P. putida EM42 pSEVA2213_bglC grown on d‐glucose or d‐cellobiose, respectively, and transforming d‐xylose to d‐xylonate.
P. putida strain and culture conditions | μ (h−1) e | Xylonate yield (g g−1 xylose) | Xylonate productivity (mg l−1 h−1) | CDW (g) | pH |
---|---|---|---|---|---|
EM42 resting cells opt a | n.a. | 0.56 ± 0.06/0.85 ± 0.06 | 217 ± 15/164 ± 11 | 0.15 ± 0.01/0.16 ± 0.01 | 6.30 ± 0.01/5.99 ± 0.08 |
EM42 glucose |
0.58 ± 0.02 | 0.18 ± 0.02/0.17 ± 0.03 | 69 ± 6/32 ± 6 | 1.73 ± 0.12/1.60 ± 0.06 | 6.26 ± 0.01/5.81 ± 0.03 |
bglC+ EM42 cellobiose | 0.27 ± 0.03 | 0.30 ± 0.06/0.48 ± 0.09 | 114 ± 18/93 ± 13 | 1.46 ± 0.13/1.88 ± 0.05 | 6.16 ± 0.06/5.19 ± 0.03 |
bglC+ EM42 cellobiose optA b | 0.28 ± 0.05 | 0.34 ± 0.05/0.54 ± 0.10 | 138 ± 21/107 ± 17 | 2.06 ± 0.07/1.85 ± 0.03 | 6.23 ± 0.07/5.88 ± 0.05 |
bglC+ EM42 cellobiose optB c | 0.30 ± 0.02 | 0.35 ± 0.02/0.50 ± 0.01 | 144 ± 8/102 ± 3 | 2.41 ± 0.11/2.18 ± 0.07 | 6.27 ± 0.08/6.00 ± 0.04 |
bglC+ EM42 cellobiose PHA d | 0.24 ± 0.01 | 0.41 ± 0.09/0.52 ± 0.08 | 156 ± 32/99 ± 13 | 0.86 ± 0.02/1.24 ± 0.14 | 6.24 ± 0.02/5.90 ± 0.01 |
Values represent the mean ± standard deviation of three biological replicates. Parameters (except for μ) were determined after 24 h/48 h of the culture. CDW, cell dry weight; n.a., not applicable.
Resting cells, pre‐cultured in LB medium, were incubated in flasks with M9 minimal medium buffered with 100 mM sodium phosphate buffer and shaken at 300 r.p.m.
Cultures, inoculated from pre‐cultures grown in LB medium, were carried out in flasks with M9 minimal medium buffered with 100 mM sodium phosphate buffer and shaken at 300 r.p.m.
Cultures, inoculated from pre‐cultures grown in M9 medium with d‐cellobiose, were carried out in flasks with M9 minimal medium buffered with 100 mM sodium phosphate buffer and shaken at 300 r.p.m.
Cultures were carried out in flasks with M9 minimal medium with reduced content of nitrogen, buffered with 100 mM sodium phosphate buffer and shaken at 300 r.p.m.
The specific growth rate (μ) was determined during exponential growth.