Table 1.

Tandem MS of OP3-4 and DOTA-OP3-4 peptides using ITMS.

	TOF-MS (Full Scan MS)		ITMS MS-MS Product Ions (Ion Trap)
Peptide	(m/z)	Tentative Assignment	SIM (m/z)	MS/MS Product Ion (m/z)	Tentative Assignment	MS/MS Scan Range
OP3-4	1451.6960	[M + H]+				500–1500
	726.377808	[M + 2H]2+	726	886	b7-2H	300–1200
				733	b6-H2O
				715	b6-2H2O
				564	y4
DOTA-OP3-4	1040.52070	[M + 2H]2+
	694.01938	[M + 3H]3+	694	987		300–1200
				691	b11-2H2O-NH32+
				596
				514	y72+
				458	y62+
				401	y52+