Strategies to Prevent Bacterial Adhesion on Biomaterials - Biomimetics: Advancing Nanobiomaterials and Tissue Engineering - page 185

Table 7.2 Effects of magnetic fi eld on bacterial growth and viability.

Type of Bacteria and
Exposure Time

Magnetic Field Strength Biological Effects Comments

Ability to form colonies
decreased with

Possible effect of electro-
magnetic fi eld on the
permeability of the
ionic channels in the
membrane or formation
of free radicals due to
magnetic fi eld [111].

B m =2.7 − 10 mT at 50 Hz E. coli

(0

• increasing mag. fi eld
• time of exposure

−

− 12 min.)

Clinical electromag-
netic bone stimulator
(B m =1.5 mT)

No obvious differences
were found between
test and control with
any of the four bacterial
species

The Magnetic fi elds of a
bone stimulator have
hardly any effect on bac-
teria [120].

E. coli (40 min.)
P. a e r ug i n o s a (50 min.)
B. magaterium (90 min.)
S. aureus (90 min.)

2.7 − 10 mT E. coli

L. adecarboxylata
S. aureus
(12 min. all)

• Exponential decrease
with mag. fi eld
• Number of CFU
decreases with time of
exposure

• E. coli is much more sus-
ceptible to mag.
fi eld compared to
S. aureus
• The decrease of the CFU
starts immediately after
the magnetic fi eld was
switched on [121].