Molasses feed - Biotechnologie Kempe Gmbh

Biotechnologie-Kempe GmbH 1
FMC – molasses feed strategy for baker´s yeast production
Exact dosage of molasses, which means a dosage according the requirements, plays a very
important role in baker´s yeast fermentation.
According the growth of the yeast a theoretical molasses feed curve is given (Fig.1). If
molasses feed is based on this curve, in all probability the supply with nutrients is either too
high or too low, because fluctuations in molasses quality as well as physiological alterations
of the yeasts are not considered.
Molasses feet (kg/h)
600
500
400
300
200
100
Molasses feed curve of commercial yeast (Bronn 1974)
theoretical molasses feed curve
changeable molasses feed band
0
0 2 4 6 8 10 12 14
Time (h)
Fig.: 1
In case of a surplus of sugar, yeasts produce alcohol, which is assimilated again in case of
sugar deficiency. Therefore measuring of alcohol concentration in the fermenter can be used
for control of molasses feed.
Biotechnologie-Kempe GmbH has developped further the method of molasses feed.
The strategy used is shown in Fig. 2. Here the molasses feed curve for the respective
fermentation is preset in the FMC system by the technologist. The deviation from the pre-set
alcohol value corrects automaticaly the molasses feed curve within a changeable band (see
Fig.1).
By use of this feed strategy the dosage of molasses can be automaticaly adjusted very
exactly to the requirements of the yeast. The result is a constant yeast quality and a
saving of molasses (since normally exceeded feed ).
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Biotechnologie-Kempe GmbH 2
alcohol
set point
Fig.:
2
molasses
control valve flow meter
FMC – SYSTEM
(Software)
Input: mol. feed curve