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. Author manuscript; available in PMC: 2011 Jul 15.
Published in final edited form as: Anal Chem. 2010 Jul 15;82(14):6208–6214. doi: 10.1021/ac101022m

Figure 2.

Figure 2

MALDI-TOF mass spectrum of a polyamine mixture containing 1 mM each of spermine (m/z 203, [M+H]+; m/z 225, [M+Na]+), spermidine (m/z 168, [M+Na]+) and putrescine (m/z 111, [M+Na]+). Graphene was used as matrix.