HPPH - What does HPPH stand for? The Free Dictionary
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As expected, phenytoin and HPPH did not interact strongly with the column.
Assuming that the metabolite possessed the phenytoin or HPPH core as part of its overall structure, we performed reversed-phase chromatography with a shallow acetonitrile gradient, monitoring m/z 251 and 268 in the negative-ion mode.
In summary, the ACS:180 Phenytoin assay does not cross-react with HPPH or oxaprozin.
Cross-reactivity of oxaprozin and HPPH in TDx Phenytoin, TDx Phenytoin-II, and ACS:180 Phenytoin assays in serum pools with and without phenytoin.