Joined: 16 Mar 2004 |Posted: Fri May 08, 2009 9:45 am Post
subject: Enzyme Coat Kills Germs, Digests Stains |A way to
attach a coating of 'live' enzymes onto plastic and other
materials could lead to clothes that digest stains as soon as
they occur, or kitchen surfaces able to kill bacteria. US
researchers have shown they can make plastic films containing
active enzymes like those in biological clothes detergents. The
process used is based on one typically used to produce thin,
flat plastic products such as CDs, DVDs and flat-screen
displays. Known as "spin coating", it involves placing a large
dollop of a liquid onto a flat surface which is then rotated at
great speed. This generates powerful centrifugal forces that
push the solution towards the surface edges and cause some
liquid to evaporate, leaving behind a thin, solid film over the
entire surface. The thickness of the film depends on the
properties of the original solution, such as its viscosity, and
the spinning speed. In a spin Using 10-cm plastic dis