title: Development of methods to monitor ionization modification from dosing vehicles and phospholipids in study samples.
abstract: Two approaches to monitor the matrix effect on ionization in study samples were described. One approach is the addition of multiple reaction monitoring transitions to the bioanalytical methods to monitor the presence of known ionization modification-causing components of the matrix, for example, m/z 184→125 (or m/z 184→184) and m/z 133→89 may be used for phospholipids and polyethylene oxide containing surfactants, respectively. This approach requires no additional equipment and can be readily adapted for most method. The approach detects only the intended interfering compounds and provides little quantitative indication if the matrix effect is within the tolerable range (±15%). The other approach requires the addition of an infusion pump and identifies an appropriate surrogate of the analyte to be infused for the determination of modification on the ionization of the analyte. The second approach detects interferences in the sample regardless of the sources (i.e., dosing vehicle components, co-administrated drugs, their metabolites, phospholipids, plasticizers and endogenous components introduced due to disease stage).
authors.affiliation: Biogen Idec, San Diego, CA, USA. min.chang@sbcglobal.net
authors.forename: Min
authors.initials: M
authors.lastname: Chang
authors.forename: Yongchao
authors.initials: Y
authors.lastname: Li
authors.forename: Reginald
authors.initials: R
authors.lastname: Angeles
authors.forename: Samina
authors.initials: S
authors.lastname: Khan
authors.forename: Lian
authors.initials: L
authors.lastname: Chen
authors.forename: Julia
authors.initials: J
authors.lastname: Kaplan
authors.forename: Liyu
authors.initials: L
authors.lastname: Yang
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002851:Chromatography, High Pressure Liquid; D007477:Ions / Q000737:chemistry; D010743:Phospholipids / Q000032:analysis*; D011092:Polyethylene Glycols / Q000032:analysis*; D011136:Polysorbates / Q000032:analysis; D021241:Spectrometry, Mass, Electrospray Ionization; D013501:Surface-Active Agents / Q000737:chemistry
chemical_list: D007477:Ions; D010743:Phospholipids; D011136:Polysorbates; D013501:Surface-Active Agents; D011092:Polyethylene Glycols