The Chemical Reactivity and Modification of Keratin Fibres

Dimensional stability of waterlogged wood treated with hydrolyzed feather keratin

“…The amide I band has been primarily assigned to the C¼O stretching frequency of the peptides (Miyazawa and Blout, 1961). When keratins were hydrolyzed by strong alkali, belimination occurred in the first stage and then the peptide chains were cleaved continuously (Leon, 1975). The decrease of the amide I band absorbance in the spectra of chicken and goose feather keratin solutions was probably attributed to the cleavage of the peptide chains.…”

Changes in the Chemical Composition of Wool During Dyeing and Finishing and Their Effects on Fabric Properties

“…The chromatographic method of amino acid analysis was originally developed by Martin and Synge for wool fibers [ 10 ] . The method is widely regarded as the &dquo;standard&dquo; by which the chemical composition of the wool fiber can be evaluated.…”

“…The method is widely regarded as the &dquo;standard&dquo; by which the chemical composition of the wool fiber can be evaluated. First, the wool samples must be subjected to acid hydrolysis in 6 M hydrochloric acid at 110°C for 24 hours [ 10,18 ] . Under these conditions, water molecules attack the protonated amide links, converting wool into its individual amino acids [ 10 ] .…”

“…First, the wool samples must be subjected to acid hydrolysis in 6 M hydrochloric acid at 110°C for 24 hours [ 10,18 ] . Under these conditions, water molecules attack the protonated amide links, converting wool into its individual amino acids [ 10 ] . After hydrolysis, the amino acid contents in the analyte are determined by high pressure liquid chromatography (HPLC).…”

“…Tyrosine, serine, threonine, methionine, and cystine can be decomposed also, unless certain pre- [ 10,18 ] . Opinion as to whether cystine is appreciably destroyed by hydrolysis is divided, but it is safest to use dedicated methods to evaluate both cysteine and cystine contents.…”