Phenom Support Answers

A collection of questions that received good ratings and feedback from our customers.

• What causes negative peaks in a GC chromatogram?
• What changes are allowed to USP/EP gradient methods?
• What conditions do you use for HILIC SPE?
• What conditions may require increased filtration force when us Strata Impact for protein precipitation?
• What do you recommend for multiresidue pesticides analysis?
• What do you recommend for the extraction of glutathione (GSH) and its oxidized form, glutathione disulfide (GSSG)?
• What does Reagent 6 do in the EZ:faast GC/FID kit?
• What effect does injection volume have on peak width?
• What effects do water and oxygen have on GC column lifetime?
• What factors affect HPLC column lifetime?
• What GC column is suitable for separation of permanent gases?
• What happens when a larger than necessary SPE bed mass is used?
• What information is required in order to recommend a SPE method?
• What Inter Diameters and Outer Diameters correspond to the different colored capillary PEEK tubing?
• What is a depth filter?
• What is a reasonable detection limit to expect with an RI detector?
• What is a recommended protocol to pretreat whole blood using zinc sulfate?
• What is a recommended starting method for the extraction of fat soluble vitamins from plasma?
• What is a recommended starting method to extract glyphosate from corn?
• What is a safe centrifuge speed for eluting solutions through 96-well plates?
• What is a safe centrifuge speed for eluting solutions through 96-well plates? (Pretreatment series)
• What is a split injection?
• What is a steady state for filters and how does this apply to Phenex?
• What is accelerated solvent extraction ( ASE )?
• What is accelerated solvent extraction (ASE)?
• What is APCI?
• What is chemical ionization?
• What is coconut charcoal SPE used for?
• What is diatomaceous earth?
• What is dried blood spot analysis (DBS)?