Molecular Sequence
Shared amino acid patterns provide a basis for identifying the biological origins of animal hair fibers. These alpha keratin homologies exist because different mammal species share common evolutionary ancestors, resulting in similar protein structures in their fleece. Analysts use these overlaps to distinguish between closely related fibers.
Identifying the specific conserved regions enables a laboratory to verify if a sample is pure or blended.
Comparative Chemistry
Verification involves digesting the fiber into smaller peptide chains and mapping them against known genomic databases. When alpha keratin homologies are detected in a sample, the degree of similarity determines the likelihood of a specific species match. This process requires high resolution mass spectrometry to ensure the peptide masses are measured with sufficient accuracy to separate sheep from goat.
Precise mapping prevents the false identification of common wool as rare vicuna by focusing on the minute differences in protein folding.
Adulteration Screening
Commercial checkpoints use protein similarities to catch the substitution of expensive specialty fibers with lower grade wool. Because alpha keratin homologies are extensive between caprine and ovine species, the test must look for unique variations that sit outside these shared sequences. A mismatch in the expected pattern indicates the presence of an undeclared fiber type.
Detection Scope
Quantitative limits exist because heat or chemical treatments during dyeing can damage the protein chains. If the degradation is too severe, the alpha keratin homologies become difficult to recover and the identification fails. Processing history determines whether the molecular signature remains intact.
