Biomedical Engineering Reference
In-Depth Information
0.55
Control
Rhamnolipid 1.0%
Rhamnolipid 0.25%
Surfactin 0.1%
Surfactin 0.5%
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
2
6
12
Time (h)
FIGURE 7.1
Removal of
Listeria monocytogenes
biofilms from polystyrene surfaces by
surfactin and rhamnolipid biosurfactants after different contact times.
(a)
(b)
FIGURE 7.2
SEM images of 48 h biofilm of mixed culture of
L. monocytogenes
,
S. aureus
,
and
S. enteritidis
established on polystyrene surface: (a) without biosurfactant addition and
(b) after 2 h contact with surfactin 0.1% solution (magnification 10,000×).
decreased biofilm removal percentage. The different susceptibilities of each bacte-
rial biofilm to the BSs can be related to the amount and chemical composition of the
polymeric material produced by the strains.
Tahmourespour et al. (2011) observed that a BS produced by
L. fermentum
was
able to inhibit the production of extracellular glucans by
Streptococcus mutans
,
a well-known biofilm-producing bacterium involved in dental caries. It was hypoth-
esized that two enzymes produced by
S. mutans
for polymer synthesis were inhibited
by the BS. The BS showed substantial antibiofouling activity reducing the process
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