Phenomenex | Ghost Peaks Technical Tip: (BOO!) How to Spot Them & Scare Them Away
Peaks in your chromatogram not attributed to the sample injected are commonly referred to as ghost peaks. Several problems can be the cause of ghost peaks manifesting, including: Late eluting peaks from the previous injection Injector carryover Solvent impurities in the mobile phase Late Eluting Peaks from Previous Injection In this example, a strongly retained compound […]
USP PROFICIENCY TESTING PROGRAM
USP <621> Chromatography HPLC Proficiency Test for Liquids Proficiency Test for laboratories performing testing in accordance with USP <621> using High Pressure Liquid Chromatography HPLC on liquid pharmaceutical materials. Choose Study: PH-0921, PH-0122, PH-0422 Qualitative and Quantitative Proficiency Test (PT) for laboratories performing HPLC Assay of liquid material by USP <621> or equivalent. Participants may report […]
FIND OUT WHAT PUTS THE “PLUS” IN YOUR ZB-624PLUS
While 624plus is an EPA method that was popular in environmental laboratories to analyze volatile organic compounds, our ZB-624 phase was immensely popular in pharmaceutical industry. This column was first developed and commercialized in 1997 to quantitate residual solvents in drug substance and drug product. With evolution in surface deactivation and polymer crosslinking, Phenomenex R&D […]
