Patent ID: 7816527

Claim:
A kit, the kit comprising: a) a ketone- or aldehyde-reactive compound having the formula: wherein Q is carbonyl, thiocarbonyl, or sulfonyl, and R 5 is -L-Z; L is arylene, or a C 1-6 perfluoroalkylene; and Z is a (C═O)NR 6 NH 2 , —NR 6 —NH 2 , —(SO 2 )NR 6 NH 2 or —(C═S)NR 6 NH 2 , wherein R 6 is hydrogen or C 1-6 alkyl; R 11 , R 12 , R 13 and R 14 are independently H, C 1-6 alkyl, C 1-6 alkylamino, amino, or halogen; and R 21 , R 22 , R 23 , and R 24 are independently H, C 1-6 alkyl, C 1-6 alkoxyl , C 1-6 perfluoroalkyl, C 1-6 alkylamino, di(C 2-12 -alkyl)amino, amino, carboxy, cyano, halogen, hydroxy, nitro, phenyl, sulfo, or -L-Z; and b) instructions for labeling an aldehyde- and/or ketone-containing target substance, wherein said compound is present as a stock solution in an organic solvent.