Table 3.
Growth parameters of C. utilis and K. marxianus in a chemically defined medium containing a sugar mixture simulating an enzymatic hydrolysate of cladode biomass (mean values are shown)
| Parameter | C. utilis | K. marxianus |
|---|---|---|
| Residual sugars (g L−1) | 17.21 | 9.60 |
| µmax (h−1) | 0.40 | 0.71 |
| Yx/s (g g−1) | 0.46 | 0.24 |
| Yp/s (g g−1) | 0 | 0.12 |
| Qs (g sugars L−1 h−1) | 2.59 | 4.05 |
| Ethanol (g L−1) | ND | 6.44 |
| Ethyl acetate (g L−1) | ND | 0.34 |
| Acetaldehyde (g L−1) | ND | 0.25 |
| Acetic acid (g L−1) | 1.72 | 2.54 |
| Glycerol (g L−1) | 0.01 | 0 |
| Final protein concentration (g L−1) | 11 | 6.2 |
µmax, maximum specific growth rate; Yx/s, biomass yield coefficient on total sugars assimilated; Yp/s, ethanol yield coefficient on total sugars assimilated; Qs, maximum volumetric rate of total sugars uptake, calculated from the slope of the curve of product concentration versus time; ND, not detected.