Fibre Protein
Insoluble structural proteins rich in sulfur make up the protective outer coat and inner cortex of all animal hair fibres. The molecular composition of keratin gives wool, cashmere and mohair their high elasticity, strength and thermal properties. This protein resists chemical degradation and maintains its structure through harsh textile processes.
Molecular Structure
The high concentration of cysteine amino acids forms many disulfide bonds that stabilize the three-dimensional protein matrix. Within the fibre, keratin molecules assemble into organized microfibrils that run parallel to the shaft. This tight arrangement makes the protein difficult to dissolve without strong reducing agents.
Species Identification
Genetic differences among sheep, goats and camels result in minor variations in the primary amino acid sequence of their wool. Analyzing these distinct keratin sequences allows laboratories to identify the exact animal source of the raw fleece or finished garment. This protein-based analysis is highly reliable because it survives the scouring, spinning and dyeing processes that destroy DNA.
Retailers and regulators rely on these unique signatures to detect and deter the mislabeling of luxury natural fibers.
Quality Assessment
Complete extraction and sequence analysis yields a detailed protein profile of the textile material. Verifying the specific keratin types confirms the premium status of the fibre and ensures compliance with trade declarations.
