Table 1.
Comparison of growth, biomass and phycocyanin (C-PC) productivity in mixotrophic culture of A. platensis. The same superscript letter down a column indicates results that are not statistically significantly different.
| Specific Growth Rate (d−1) | Maximum Specific Growth Rate (d−1) * | Biomass Productivity (mg/l/d) | Maximum Biomass Productivity (mg/l/d) * | Maximum C-PC Productivity (mg/l/d) ** |
PHB Productivity (mg/l/d) | |
|---|---|---|---|---|---|---|
| Photoautotroph | 0.09 ± 0.004 c | 0.12 ± 0.001 d | 111 ± 7 f | 130 ± 31 d | 36.7 ± 0.5 ab | 0 c |
| Acetate | 0.17 ± 0.008 a | 0.24 ± 0.009 a | 272 ± 8 a | 341 ± 9 a | 39.6 ± 0.1 a | 3.6 ± 1.1 b |
| Oxalate | 0.11 ± 0.002 bc | 0.14 ± 0.004 d | 152 ± 2 d | 177 ± 9 c | 36.3 ± 1.2 ab | 0 c |
| Glycerol | 0.09 ± 0.009 c | 0.23 ± 0.009 ab | 130 ± 7 e | 344 ± 16 a | 23.9 ± 1.2 d | 11.1 ± 1.7 a |
| G + O | 0.12 ± 0.003 b | 0.19 ± 0.002 c | 183 ± 1 c | 260 ± 11 b | 28.3 ± 0.1 c | 3.6 ± 0.7 b |
| G + O + A | 0.15 ± 0.006 a | 0.20 ± 0.009 bc | 227 ± 5 b | 259 ± 7 b | 34.6 ± 1.5 b | 3.9 ± 0.7 b |
* Maximum specific growth rate and maximum biomass productivity are calculated based on the amount of biomass at day 0 and 4 for all treatments. ** Maximum C-PC productivity is calculated based on the amount of C-PC at day 0 and 6 for photoautotroph, acetate and oxalate. However, for glycerol, G + O and G + O + A treatments, calculation was based on C-PC produced between day 0 and 4.