Table 2. Kinetic parameters of ethanol production from sweet sorghum juice with and without yeast extract supplementation by S. cerevisiae NP 01 in different bioreactors.



Bioreactor size

 

Yeast extract concentration
(g l-1)

Parameters (mean ± SD)*

Cell concentration
(cells ml-1) at

 P (g l-1)

Qp (g l-1h-1)

Yp/s (g g-1)

t (h)

0 h

t (h)

500-ml

0

113.76 ± 0.22

2.84 ± 0.01

0.51 ± 0.00

40

9.75 x 107

2.59 x 108

9

120.24 ± 1.35a

3.01 ± 0.08b

0.49 ± 0.00a

40

1.06 x 108

2.85 x 108

5-litre

0

128.93 ± 1.01

2.15 ± 0.02

0.52 ± 0.02

60

9.38 x 107

3.06 x 108

9

139.51 ± 0.11b

3.49 ± 0.00c

0.49 ± 0.00a

40

9.63 x 107

4.09 x 108

50-litre

0

106.85 ± 0.25

1.11 ± 0.02

0.47 ± 0.01

96

2.25 x 107

2.26 x 108

9

119.53 ± 0.20a

2.13 ± 0.01a

0.51 ± 0.01b

56

2.20 x 107

3.68 x 108

*P: ethanol concentration, Qp: ethanol productivity, Yp/s: ethanol yield and t: fermentation time.
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