A study of common discovery dosing formulation components and their potential for causing time-dependent matrix effects in high-performance liquid chromatography tandem mass spectrometry assays
Article first published online: 26 AUG 2005
Copyright © 2005 John Wiley & Sons, Ltd.
Rapid Communications in Mass Spectrometry
Volume 19, Issue 18, pages 2643–2650, 30 September 2005
How to Cite
Xu, X., Mei, H., Wang, S., Zhou, Q., Wang, G., Broske, L., Pena, A. and Korfmacher, W. A. (2005), A study of common discovery dosing formulation components and their potential for causing time-dependent matrix effects in high-performance liquid chromatography tandem mass spectrometry assays. Rapid Commun. Mass Spectrom., 19: 2643–2650. doi: 10.1002/rcm.2102
- Issue published online: 26 AUG 2005
- Article first published online: 26 AUG 2005
- Manuscript Accepted: 17 JUL 2005
- Manuscript Revised: 15 JUL 2005
- Manuscript Received: 27 MAY 2005
Hydroxyproyl-β-cyclodextran (HPBCD), methyl cellulose (MC), Tween 80 and PEG400 are commonly used in dosing formulations in pharmacokinetic (PK) studies during the early drug discovery stage. A series of studies was designed to evaluate the potential matrix effects of these dosing vehicles when the samples are assayed by high-performance liquid chromatography combined with tandem mass spectrometry (HPLC/MS/MS). These dosing vehicles were dosed into the rats via either an intravenous (IV) or an oral route (PO) and plasma samples were collected for a 24-h post-dose period. Five test compounds with CLog P values ranging from 0.9 to 5.4 were spiked into the collected rat plasma. After protein precipitation, these samples were analyzed using a generic fast-gradient HPLC/MS/MS method. Three popular mass spectrometers (Thermo-Finnigan Quantum with ESI and APCI, AB-Sciex API 3000 with ESI and APCI, and Waters-Micromass Quattro Ultima with ESI) were used to test these plasma samples. Results indicated that there was no observed matrix effect for all five compounds when 20% HPBCD or 0.4% MC was used as the vehicle in either the IV or the PO route, respectively. In addition, 0.1% Tween 80 dosed either IV or PO caused significant ion suppression (50–80%, compared to results obtained from plasma samples free from vehicles) for compounds that eluted at the beginning of the chromatogram. Also, PEG400 when used in an oral formulation caused significant ion suppression (30–50%) for early eluting compounds. These matrix effects were not only ionization mode (ESI or APCI) dependent, but also source design (Thermo-Finnigan, AB-Sciex or Waters-Micromass) dependent. Overall, the APCI mode proved to be less vulnerable to matrix effects than the ESI mode. Some possible mechanisms of these matrix effects are proposed and simple strategies to avoid these matrix effects are discussed. Copyright © 2005 John Wiley & Sons, Ltd.