Mass Spectrometry

Adduct Ions

Cationized Adducts		Anionized Adducts
[M+NH₄]⁺	M_r + 18	[M+Na]^-	M_r + 21
[M+Na]⁺	M_r + 23	[M+Cl]^-	M_r + 35
[M+CH₃OH+H]⁺	M_r + 33	[M+HCOO]^-	M_r + 45
[M+K]⁺	M_r + 39	[M+OAc]^-	M_r + 59
[M+CH₃CN+H]⁺	M_r + 42	[M+K]^-	M_r + 37
[M+DMSO]⁺	M_r + 79	[M+TFA]^-	M_r + 113
Preformed		Preformed
M⁺; [M+H]⁺	M_r ; M_r +1	M^-; [M-H]^-	M_r ; M_r -1

H Tong et al (1999) J. Am. Soc. Mass Spec. 10, 1174-87