Fig. 4From: Laser desorption/ionization mass spectrometry of L-thyroxine (T4) using combi-matrix of α-cyano-4-hydroxycinnamic acid (CHCA) and grapheneMALDI-TOF mass spectrometry based on the combi-matrix using Asparagine (Asn) as a model analyte. The combi-matrix was composed of a CHCA and graphene, b DHB and graphene, and c 9-AA and grapheneBack to article page