Table 1. Kinetic parameters of ethanol production from sweet sorghum juice containing various yeast extract concentrations by S. cerevisiae NP 01 in 500-ml Erlenmeyer flasks.



Yeast extract concentration (g l-1)

Parameters (mean ± SD)*

P (g l-1)

Qp (g l-1h-1)

Yp/s (g g-1)

t (hrs)

0 (control)

113.76 ± 0.22a

2.84 ± 0.01a

0.51 ± 0.00b

40

3

113.21 ± 0.10 a

2.83 ± 0.01a

0.50 ± 0.00c

40

6

116.21 ± 1.02b

2.91 ± 0.10a,b

0.49 ± 0.01a

40

9

120.24 ± 1.35c

3.01 ± 0.08b

0.49 ± 0.00a

40

*P: ethanol concentration, Qp: ethanol productivity, Yp/s: ethanol yield and t: fermentation time. The experiments were performed in duplicate.
a, b, c Means followed by the same letter within the same column are not significantly different using Duncan’s multiple range test at the level of 0.05.


Supported by UNESCO / MIRCEN network