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Reversed-phase HPLC quantifies purity (the 99% threshold for research grade), and liquid-chromatography mass spectrometry (LC-MS) confirms identity by measuring molecular weight
Always place semaglutide in the main refrigerator compartment, never in the freezer, and keep it away from the cold-air vents that can accidentally freeze the liquid
This technique typically uses a specimen that is ultrathin, with a section size of less than 100 nm, or a suspension on the grid
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