Patent ID: 7321022
Filing Date: 2008-01-22
Classification: G01N

Abstract:
1. A method of controlling the stability of a film comprising exposing the film to an oxidizing agent or a reducing agent, wherein the film comprises a plurality of layers of polypeptides, wherein adjacent layers are oppositely charged, wherein a first layer comprises a first layer polypeptide and a second layer comprises a second layer polypeptide, wherein the first layer polypeptide is not a homopolymer, is at least 15 amino acid residues long, has a balance of charge at pH 7 greater than or equal to approximately one-half of its total length and comprises a sulfhydryl-containing amino acid residue and one or more first amino acid sequence motifs, wherein the second layer polypeptide is at least 15 amino acid residues long, and has a balance of charge at pH 7 greater than or equal to approximately one-half of its length and of opposite polarity to that of the first layer polypeptide, and comprises one or more second amino acid sequence motifs, with the proviso that: