Thursday, December 11, 2008

SILK AND COMPOSITION 3


CHEMICAL PROPERTIES:-

Silk is made up of the amino acids GLY-SER-GLY-ALA-GLY and forms Beta pleated sheets. Interchange H-bonds are formed while side chains are above and below the plane of the H-bond network.

EFFECT OF ACIDS:-
Silk is resistant to Mineral acids. It is yellowed by perspiration and will dissolve in Sulphuric acid.

EFFECT OF ALKALI:-
Silk is damaged by strong alkaline solutions.

EFFECT OF BLEACHES:-
Silk may be damage in Chlorine bleaches. How ever bleaches of Hydrogen-peroxide and Sodium Per borate are safe to use.

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