Mass Spectrometry Proteomic Profiling for Fine Animal Fiber Verification
LC-MS/MS proteomic profiling quantifies species-specific keratin peptide markers, bypassing optical scale damage to verify fine animal fiber purity.
Solid Phase Extraction C18
Sample Clean-up
Chromatographic sample preparation technique utilizing octadecylsilane-bonded silica sorbents isolates and concentrates non-polar analytes from aqueous textile extracts. Solid phase extraction C18 cleans up complex dye, finishing chemical, or wastewater matrices prior to instrumental chromatographic analysis. The method governs trace contaminant extraction and environmental residue monitoring, applying to aqueous or semi-polar solvent solutions and stopping when highly polar hydrophilic compounds cannot bind to non-polar hydrophobic C18 chains.
Sorbent cartridges retain hydrophobic organic molecules while polar impurities wash through under controlled vacuum pressure.
Retention Mechanism
Non-polar C18 hydrocarbon chains interact with hydrophobic regions of target analytes via van der Waals forces. Conditioning cartridges with methanol and water activates hydrophobic sites before sample loading. Matrix interferences pass through without retaining on sorbent beds.
Elution Protocol
Solvents such as acetonitrile or dichloromethane disrupt hydrophobic interactions, eluting concentrated analytes into collection vials. Precise flow control during loading and elution maximizes analyte recovery rates. Nitrogen drying concentrates eluted fractions prior to liquid chromatography injection.
Analytical Precision
Eliminating interfering matrix compounds prevents column contamination and mass spectrometer signal suppression. Solid phase extraction C18 improves signal-to-noise ratios, allowing detection of trace banned chemicals at microgram per kilogram levels. Accredited testing protocols require validation of recovery percentages across standard spike samples.