Fig 5. Two peptide markers discovered in our study for discrimination and quantification of cashmere fibers.

(A) The MS/MS spectra of the two cashmere marker peptides obtained from cashmere-wool mixtures. (B) The PRM transitions of cashmere markers extracted by Skyline software. (C) The standard curves established for two cashmere marker peptides using PRM analysis. W1 and C1 mixtures were prepared with varying C1 percentages.