DESI Desorption 1 Desorption electrospray ionization 1 Ecdysteroids 1 Electrospray ionization 1 HPTLC-MS 1 High-resolution time-of-flight mass spectrometry 1 Image processing 1 Ion sources 1 MS-imaging 1 Mass spectrometers 1 Mass spectrometry 1 Performance 1 Phytoecdysteroid 1 Phytoecdysteroids 1 Reversed phase 1 Reversed-phase 1 Reversed-phase high performance 1 Silica gel 1 Thin layer chromatography 1 Time-of flight 1