2-Hydroxy-5-methoxybenzoic acid is matrix additive which enhances the electrical conductivity of the matrix crystal during matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS);2-Hydroxy-5-methoxybenzoic acid is matrix additive which enhances the electrical conductivity of the matrix crystal during matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS)