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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 3. Supplementation of filtered stillage with yeast extract (YE) and molasses (5% and 10%); pH controlled with NH4OH.



Parameter

5%M

10%M

2.65g/l YE

5.31g/l YE

10.62g/l YE

2.65g/l YE

5.31g/l YE

10.62g/l YE

Glucose conversion [%]*

100

100

100

67.2

99.9

99.8

Max LA [g/l]

21.6
[32 h]

25.0
[32 h]

27.6
[24 h]

38.6
[48 h]

41.2
[24 h]

40.9
[24 h]

Maximal number of LAB [cfu/ml]

2.4 x 109
[12 h]

2.8 x 109
[12 h]

3.4 x 109
[12 h]

3.1 x 109
[12 h]

3.0 x 109
[12 h]

3.6 x 109
[12 h]

YP/S [g/g]*

0.74
(74%)a

0.84
(84%)a

0.945
(94.4%) a

0.665
(44.7%) a

0.895
(89%) a

0.86
(86%) a

QP [g/(l·h)]*

0.89

1.04

1.15

0.94

1.72

1.70

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