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Electronic Journal of Biotechnology ISSN: 0717-3458
  © 2011 by Universidad Católica de Valparaíso -- Chile
Vol. 14 No. 2, Issue of April 15, 2011
 

Table 5. Supplementation of sieved stillage with yeast extract (YE) and molasses (5% and 10%); pH controlled with NaOH.



  

5%M

10%M

Parameter

2.65 g/l YE

5.31 g/l YE

10.62 g/l YE

2.65 g/l YE

5.31 g/l YE

10.62 g/l YE

Glucose conversion [%] *

98.8

98.8

100

39.7

35.3

67.7

Max LA [g/l]

28.5
[36 h]

28.9
[48 h]

26.5
[24 h]

49.2
[60 h]

48.7
[60 h]

50.2
[60 h]

Maximal number of LAB
[cfu/ml]

1.2 x 109
[24 h]

2.7 x 109
[24 h]

2.3 x 109
[24 h]

2.2 x 109
[24 h]

3.4 x 109
[12 h]

4.8 x 109
[12 h]

YP/S [g/g] *

1.08
(108%)a

1.09
(109%)a

0.94
(94%)a

0.675
(27%)a

1.43
(50%)a

0.81
(54%)a

QP [g/(l·h)] *

1.11

1.04

1.10

0.61

1.14

1.19

*Glucose conversion, YP/S and QP were calculated for values obtained in the 24 hrs of the process.
a% of the theoretical yield.