Biomedical Engineering Reference
In-Depth Information
(
a
)
(
b
)
Figure 8.8
SEM images of selenium-coated (image a) and uncoated paper
(image b) towel samples. The coating condition for image (a) was 0.5M NaOH
for 30 seconds. The concentration of selenium on the paper towel as measured
by AAS was 69.00 g/m
2
for the selenium-coated paper towels and 0 g/m
2
for the
uncoated paper towels. See [83] for more details.
2500000
2000000
24 Hours
48 Hours
72 Hours
-88.6%
-88.9%
-88.8%
1500000
1000000
500000
0
Uncoated paper
Se coated paper
Figure 8.9
Bacteria (
Staphylococcus aureus
) growth on the surface of uncoated and
selenium-coated paper towels. Paper towel samples were treated with bacteria
(
Staphylococcus aureus
) in 0.03% TSB (Tryptic Soy Broth) and were incubated for
24, 48 or 72 hours. The control group is the uncoated paper towels. Data
=
Mean
±
standard deviation, n
=
3. See [83] for more details.
samples, but was constant after the 72 hours culture time, implying that
the uncoated paper towel was saturated by bacteria after just 48 hours of
treatment. In contrast, the bacteria numbers on the selenium-coated paper
towels remained at a low level, not increasing from 24 to 48 to 72 hours,
indicating successful inhibition of bacterial growth. Overall, the bacteria
growth and biofi lm formation on paper towels were successfully inhib-
ited after coated with selenium nanoparticles, again representing a natu-
ral biomimicking approach towards fi ghting bacteria.
8.5
Summary and Outlook
In summary, this chapter presented and demonstrated the potential appli-
cations of biologically-inspired nanostructured selenium as an antibacterial
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