Table 2 Effect of dl -mandelic acid concentration on the biotransformation
dl-Mandelic acid concentration (g·L-1) | |||||
|---|---|---|---|---|---|
10 | 20 | 30 | 40 | 50 | |
Reaction time (h) | 8 | 18 | 30 | 42 | 54 |
Benzoylformic acid concentration (g·L-1) | 4.8 | 9.8 | 14.3 | 19.1 | 15.6 |
Biotransformation efficiency (g·L-1·h-1) | 0.62 | 0.55 | 0.50 | 0.47 | 0.46 |
Residual l-mandelic acid (g·L-1) | < 0.005 | 9.6 | |||
Residual d-mandelic acid (g·L-1) | 5.0 | 10.1 | 15.1 | 20.1 | 25.2 |
Enantiomeric excess (%) | > 99.5 | 45.0 | |||