3. FOOD ChEMISTRy & bIOTEChNOLOGy 3.1. Lectures

Chem. Listy, 102, s265–s1311 (2008) Food Chemistry & Biotechnology
Results
Fig. 2. shows biomass and pullulan production in presence
of modified PUR foams. It seems that the highest pullulan
production was observed in control medium (without
PUR), so, PUR presence exhibited negative effect on pullan
production.
g dm -3
14
12
10
8
6
4
2
0
control REF PUR 10% ACS 10% HEC 10% AC 10% CMC
biomass (g dm-3)
pullulan (g dm-3)
Fig. 2. biomass and pullulan production by A. pullulans grown
in presence of modified PuR foams
Conclusions
Yeast strain Aureobasidium pullulans can grow in presence
of modified polyurethane foams. Degradation degree
of BIO-PUR corresponded with growth of yeast culture. The
highest degree of degradation was found in PUR modified by
s748
40 % carboxymethyl cellulose; degree of degradation decreased
with CMC concentration.
According to our results of A. pullulans grown in PUR
presence it seems that most of modified polyurethane foams
exhibited slight negative effect on pullullan (4.3 g dm –3 control,
4.9 g dm –3 1% ACS-PUR, 3.2 g dm –3 REF-PUR) as well
as biomass production (11.5 g dm –3 control, 7.8 g dm –3 1%
ACS-PUR, 8.9 g dm –3 REF-PUR). Acetyl cellulose was the
only modification agent, which was able to enhance pullulan
(6.5 g dm –3 ) as well as biomass (12.5 g dm –3 ) production.
This work was supported by project MSM 0021630501
of the Czech Ministry of Education, Youth and Sports.
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