Spectrometry, Mass, Electrospray Ionization article electrospray mass spectrometry Direct analysis Electrospray ionization Electrospray ionization mass spectrometry Electrosprays Ionization Mass spectrometry Probes controlled study Amines Amino acids Bioactive compounds Biological systems Carbohydrate content Carbohydrates Direct profiling Flower buds In-vivo Mass spectrometers Metabolic changes Organic acids Particle detectors Phytochemicals Plant Roots Sample consumption Sample preparation Time-of-flight mass spectrometers Transducers