“…During the detection process, typically, 1 μL sample solution was pipetted on the polished target plate and air-dried. Then, 1 μL of the above matrices were added to the sample point separately and dried again, according to the method from existing works [ 15 , 30 ]. Mass spectra were acquired using a Bruker Autoflex Speed mass spectrometer (Germany) equipped with an Nd: YAG laser (2 kHz, 355 nm).…”