Antimicrobial activity
The antimicrobial activity of agar and agar/clay nanocomposite
films was tested by the viable cell count method.
Hong and Rhim
(2008) demonstrated that organically modified clay powders, substituted
with quaternary ammonium salt, especially Cloisite 30B,
showed strong antimicrobial activity against both Gram-positive
and negative bacteria with small amounts of clay.
However, when
compounded with agar, noticeable antimicrobial activity was not
observed against all the test microorganisms, regardless of clay
types, except agar/Cloisite 30B nanocomposite film (Figure 6).
As expected, pure agar and agar/Cloisite Na+ films did not show
any antimicrobial activity.
Only agar composite films compounded
with Cloisite 30B showed substantial antimicrobial activity against
L. monocytogenes.
The antimicrobial activity of nanocomposite
films prepared with Cloisite 30B is mainly attributed to the quaternary ammonium salt in the organically modified MMT (Cloisite
30B) (Rhim and others 2006; Hong and Rhim 2008).
Antimicrobial activityThe antimicrobial activity of agar and agar/clay nanocompositefilms was tested by the viable cell count method. Hong and Rhim(2008) demonstrated that organically modified clay powders, substitutedwith quaternary ammonium salt, especially Cloisite 30B,showed strong antimicrobial activity against both Gram-positiveand negative bacteria with small amounts of clay. However, whencompounded with agar, noticeable antimicrobial activity was notobserved against all the test microorganisms, regardless of claytypes, except agar/Cloisite 30B nanocomposite film (Figure 6).As expected, pure agar and agar/Cloisite Na+ films did not showany antimicrobial activity. Only agar composite films compoundedwith Cloisite 30B showed substantial antimicrobial activity againstL. monocytogenes. The antimicrobial activity of nanocompositefilms prepared with Cloisite 30B is mainly attributed to the quaternary ammonium salt in the organically modified MMT (Cloisite30B) (Rhim and others 2006; Hong and Rhim 2008).
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