Table 1.

Compounds observed with CE-TOF-MS in heat-exposed oxytocin solutions of various pH

m/z (charge)	Compound	Relative peak area (%)
		pH 2.0	pH 4.5	pH 7.0	pH 9.0
975.40 (2+)	Oxytocin “dimer”	ND	2.4	14.5	9.7
1007.43 (1+)	Oxytocin	60.6	90.6	75.8	80.3
1008.41 (1+)	Deamidated oxytocin	31.4	1.4	1.1	2.8
1009.39 (1+)	Bisdeamidated oxytocin	8.0	ND	ND	ND
1039.37 (1+)	“Trisulfide” oxytocin	ND	4.8	7.0	5.7
1071.34 (1+)	“Tetrasulfide” oxytocin	ND	0.9	1.7	1.4

ND not detected