Patent ID: 7858376

Claim:
A reagent mixture for the detection of amino acids, peptides or proteins comprising: a first reagent comprising ninhydrin; and at least one other reagent comprising at least one ionic liquid selected from 1-pentyl-3-methylimidazolium chloride, 1-hexyl-3-methylimidazolium chloride, 1-heptyl-3-methylimidazolium chloride, 1-octyl-3-methylimidazolium chloride, 1-nonyl-3-methylimidazolium chloride, 1-decyl-3-methylimidazolium chloride, trihexyltetradecylphosphonium chloride, ethyldimethylpentylammonium bromide, ethyldimethylpropylammonium chloride, 1-methyl-1-octylpyrrolidinium chloride, n-butylpyridinium chloride, n-octylpyridinium chloride, 4-methyl-4-pentylmorpholinium bromide, and 1-methyl-1-pentylpiperidinium bromide.