الفهرس 
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Abstract
Among the eight major classes of biopolymers, Which are polysaccharides, organic polyoxoesters (polyhydroxy alkanoate, polymalic acid cutin), polythioesters, inorganic polymers( polyphosphate), polyisoprenoids( natural rubber), polyphenols (lignin, humic acids), nucleic acids and polyamides, polyamides represent one of the most characterized group of biopolymers (Steinbuchel,2001)