Protein Matrix
Analytical chemistry establishes the fundamental molecular profile of fine down hair harvested from the Capra hircus goat. Raw cashmere composition consists predominantly of fibrous keratin proteins, low-sulfur intermediate filament proteins and high-sulfur keratin-associated proteins, complemented by residual surface lipids and trace moisture. Natural non-keratin impurities such as suint, soil dust and coarse guard hair must be removed during commercial scouring and mechanical dehairing.
Clean fleece contains less than one half percent coarse fibers by weight to meet commercial fineness grades. The fundamental structure breaks down under excessive chemical bleaching or aggressive thermal finishing.
Keratin Profile
Amino acid distributions within the intermediate filaments separate these luxury caprine fibers from coarse sheep fleece or synthetic substitutes. Cystine cross-links create disulfide bonds that give cashmere composition its distinctive soft mechanical recovery, elastic resilience and high wet tenacity. High levels of glycine and proline populate the matrix surrounding the cortical cells, stabilizing the fiber bundle against longitudinal mechanical shearing.
These macromolecular proportions fluctuate slightly with seasonal grazing pasture quality and goat age, yet the underlying peptide footprint remains uniform across major production origins. Environmental exposure degrades outer cuticle scales without altering the internal cortical protein balance.
Adulteration Threshold
Commercial blending with fine sheep wool or yak down alters the underlying protein profile of finished knitwear. Fraudulent manipulation of cashmere composition occurs when cheaper Merino fleeces are stripped of outer cuticle scales through acid or enzymatic treatment to mimic caprine diameters under standard light microscopy. Proteomic testing relies on specific peptide biomarkers to quantify the exact ratio of authentic caprine keratin against adulterant ovine proteins down to one percent detection limits.
Chemical markers identify industrial protein damage caused by over-scouring or aggressive chlorine shrink-proofing. Mills face shipment cancellation when third-party laboratory assays register adulterant peptides exceeding agreed contract allowances.
Commercial Verification
Quality assurance programs test yarn cones and finished garments against purchase order specifications through liquid chromatography coupled with mass spectrometry. Official inspection documents cashmere composition by verifying that mean fiber diameter stays below nineteen microns and coarse fiber content remains under contractual minimums. Finished sweaters undergo non-destructive extraction protocols to harvest cortical proteins without damaging whole garment lots.
Garment brands enforce mandatory testing schedules across raw tops, spun yarns and dyed apparel before releasing supplier invoices. Testing protocols verify true fiber content before customs clearance and retail distribution.
