Rapid Simultaneous Determination of 11 Synthetic Cannabinoids in Urine by Liquid Chromatography-Triple Quadrupole Mass Spectrometry

Synthetic cannabinoids are a series of synthetic substances that mimic the effects of natural cannabinoids and produce a much stronger toxicity than natural cannabinoids, which have become the most abused family of new psychoactive substances. A solid-phase extractive-liquid chromatography-triple quadrupole/linear ion trap mass spectrometry method was developed to determine 11 synthetic cannabinoids in rat urine. The factors affecting recovery were optimized, and Oasis HLB was selected to extract synthetic cannabinoids simultaneously. The results showed that the linear correlation coefficients of the synthetic cannabinoids ranged from 0.993 to 0.999, and the limit of quantitation ranged from 0.01 to 0.1 ng/mL, and the spiked recoveries ranged from 69.90% to 118.39%. This method has the advantages of good purification ability, simple operation, and good reproducibility, and can be used for the high sensitivity analysis of various synthetic cannabinoids in urine.

Early prediction of COVID-19 patient survival by targeted plasma multi-omics and machine learning

The recent surge of COVID-19 hospitalizations severely challenges healthcare systems around the globe and demands for reliable tests predictive of disease severity and mortality. Using multiplexed targeted mass spectrometry assays on a robust triple quadrupole MS setup which is available in many clinical laboratories, we determined the precise concentrations of 100s of proteins and metabolites in plasma from hospitalized COVID-19 patients. We observed a clear distinction between COVID-19 patients and controls and, strikingly, a significant difference between survivors and non-survivors. With increasing length of hospitalization, the survivors’ samples showed a trend towards normal concentrations, indicating a potential sensitive readout of treatment success. Building a machine learning multi-omic model that considers the concentrations of ten proteins and five metabolites we could predict patient survival with 92% accuracy (AUC 0.97) at the day of hospitalization. Hence, our standardized assays represent a unique opportunity for the early stratification of hospitalized COVID-19 patients.

UHPLC-ESI-QTOF-MS Analysis on Canthium Coromandelicum Stem

A rapid ultra high-performance liquid chromatography coupled with crossover triple quadrupole time of flight mass spectrometry (UHPLC- ESI -QTOF-MS/MS) method has been developed for the identification of debasement products. According to the distinctive fragmentation patterns, the presence of 79 compounds with retention time between 1.05 to 26.81 minutes was found. In Canthium coromandelicum stem, 22 amino acids, 10 fatty acids, 6 alkaloids, 6 steroids, 2 flavonoids, 2 terpenoids, 2 phenolic, 4 lipids, 3 anthraquinone glycosides, sugars, vitamins were distinguished. These outcomes demonstrated that the contemporary technique has been utilized for quality control of Canthium coromandelicum, exceptionally for recognizable proof, verification and portrayal in medication arrangements.