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MALDI-TOF mass spectra of a solution containing Glu (m/z 147, [M+H]+; m/z 169, [M+Na]+), His (m/z 156, [M+H]+; m/z 178, [M+Na]+) and Trp (m/z 205, [M+H]+; m/z 227, [M+Na]+; m/z 249, [M+K]+) in the: (a) LDI mode without matrix, and with matrix of CHCA (b) or graphene (c). A 0.5 μL sample solution was deposited on the target spots and the concentrations of all analytes were at 0.5 mM each.
