. Author manuscript; available in PMC: 2009 Apr 14.

Published in final edited form as: Chem Commun (Camb). 2008 Aug 11;(39):4768–4770. doi: 10.1039/b809099h

Table 1.

Observed y-ions from ESI-MS/MS analysis of the Trp²⁹⁶ peptide (252–298) by direct infusion and fragmentation of the z=4+ ion at m/z = 1383.2

Amino acid	y-ion number	Unmodified m/z observed (calc.)	Modified m/z observed (calc.)
T	7		973.48 (973.48)
V	6		872.41 (872.44)
N	5		773.39 (773.37)
F	4		659.35 (659.32)
W	3		512.28 (512.26)
Y	2	310.19 (310.18)
K	1	147.11 (147.11)