Fiber Degradation
Environmental aging processes cause structural damage in keratin and fibroin networks found within harvested animal fibers. Over extended burial or storage periods, diagenetic protein decay breaks down peptide bonds and disulfide bridges in wool or silk fibers. The chemical degradation reduces mechanical strength and alters the dye affinity of historical or long-stored textiles.
The process stops only when fibers are isolated in anoxic or dry environments that halt chemical and biological activity.
Chemical Breakdown
Moisture absorption initiates hydrolysis along the polypeptide backbone, cleaving main chain bonds into shorter peptide fragments. Atmospheric oxygen simultaneously attacks sulfur links in cystine units, converting stable disulfide bonds into cysteic acid groups. Soil microbes and ambient fungi secrete proteolytic enzymes that accelerate this molecular cleavage when relative humidity exceeds sixty percent.
As amino acid chains shorten, the protein matrix loses its crystalline alignment and solubilizes in water. Hydrophobic keratin regions transform into hydrophilic, brittle fragments that crumble under minimal mechanical stress.
Structural Impact
Weakened fiber bundles lose their natural elasticity and crimp recovery during processing. Yarns spun from decayed stock display reduced tensile strength and high fly waste during spinning.
Diagnostic Verification
Laboratories assess the extent of polypeptide damage through amino acid analysis and liquid chromatography. High cysteic acid readings confirm severe oxidative breakdown in wool shipments.
