Abstract
Coal extracts with carbon disulfide (CS_2)/N-methyl-2-pyrrolidinone (NMP) mix solvent were analyzed by laser desorption (LD) and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. MALDI method is good ionization method for large molecular weight compounds. But the coal extracts were complex mixtures, and matrices did not have enough effects for the mass spectrum. LD method had given good mass spectrum of coal extracts, and toluene solubles in extracts with CS_2/NMP were observed in selectively. LD and MALDI method provides protonated molecules and these method is good for analysis of large molecular weight compounds such as coal extracts.
