Fig. 2From: Laser desorption/ionization mass spectrometry of L-thyroxine (T4) using combi-matrix of α-cyano-4-hydroxycinnamic acid (CHCA) and grapheneOptical absorption in the UV range for the combi-matrices composed of the solid matrix (graphene) and the conventional organic matrices of a alpha-cyano-4-hydroxycinnamic acid (CHCA), b 2,5-dihydroxybenzoic acid (DHB), and c 9-AABack to article page