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Table 1 Common types of adducts in LC-MS

From: Ion annotation-assisted analysis of LC-MS based metabolomic experiment

Ionization

Formation

Ion Mass

 

[M+H]+

m+1.0073

 

[M+2H]2+

m/2+1.0073

Positive

[M+Na]+

m+22.9892

 

[M+K]+

m+38.9632

 

[M+NH4]+

m+18.03382

 

[M-H]-

m-1.0073

Negative

[M-2H]2-

m/2-1.0073

 

[M-2H+Na]-

m+20.9747

 

[M-2H+K]-

m+36.9486

  1. M is the molecule with molecular weight m
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