
High-performance liquid chromatography-tandem mass spectroscopy (HPLC–MS/MS) chromatography reveals pyrrolizidine alkaloids (PA)/pyrrolizidine alkaloid N-oxides (PANO) toxin risks in 63 tea samples.
This step-by-step method development study for a GLP-1 receptor agonist provides a robust and precise analytical workflow for purity testing of tirzepatide.






