Antibiotic analysis using Electro-Filtering Paper Spray Ionization

Synergistic effect of Ag/MXene for efficient protein ionization in paper spray mass spectrometry

Ti3C2Tx (MXene) was coated with silver (Ag) nanoparticles using a bio-inspired surface coating method. The resulting composite material, Ag/MXene (AgMX), was applied in paper spray ionization mass spectrometry (PSI-MS) for efficient protein ionization. The intensity of protein obtained by AgMX PSI-MS was enhanced about 3-6 times when compared to conventional PSI. AgMX PSI-MS demonstrated strong potential for quantitative analysis and exhibited good salt tolerance.

Rapid analysis of pharmaceutical and personal care products by soft microwave-based plasma ionization-linear ion trap mass spectrometer (SMPI-LTQ) in natural water

In this study, a soft microwave plasma torch (SMPT) combined with a mass spectrometer (MS) was used for the first time as an analytical method to detect and analyze various pharmaceutical and personal care products (PPCPs) in aquatic environments without the need for sample pretreatment. For this purpose, ambient SMPT was used to generate plasma for ionizing the analyte molecules. Accordingly, nine PPCPs were identified by the SMPT-MS, and their identification was verified by collision-induced dissociation (CID). The technique's performance was verified with known PPCP samples, and the limits of detection (LOD) and quantification (LOQ) obtained over a linear range of 50-1 μg/L were 1.56 to 2.81 and 2.07 to 3.62 μg/L, respectively, with the standard addition recovery rate falling between 87.14 and 115.16%. These results show that the method has excellent sensitivity and selectivity, suggesting that SMPT can rapidly and directly detect PPCPs in environmental water, making it a promising method for rapid water quality inspection.