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European Biophysics Journal

, Volume 39, Issue 12, pp 1637–1647 | Cite as

Effect of sodium bicarbonate as a pharmaceutical formulation excipient on the interaction of fluvastatin with membrane phospholipids

  • Germain Larocque
  • Alexandre A. Arnold
  • Étienne Chartrand
  • Yves Mouget
  • Isabelle Marcotte
Original Paper

Abstract

Excipients in the pharmaceutical formulation of oral drugs are notably employed to improve drug stability. However, they can affect drug absorption and bioavailability. Passive transport through intestinal cell walls is the main absorption mechanism of drugs and, thus, involves an interaction with the membrane lipids. Therefore in this work, the effect of the excipient NaHCO3 on the interaction of the anticholesterolemic drug fluvastatin sodium (FS) with membrane phospholipids was investigated by 1H NMR and FTIR spectroscopy. Sodium bicarbonate is often combined with fluvastatin for oral delivery to prevent its degradation. We have used model DMPC/DMPS membranes to mimic the phospholipid content of gut cell membranes. The results presented in this work show a 100% affinity of FS for the membrane phospholipids that is not modified by the presence of the excipient. However, NaHCO3 is shown to change the interaction mechanism of the drug. According to our data, FS enters the DMPC/DMPS bilayer interface by interacting with the lipids’ polar headgroups and burying its aromatic moieties into the apolar core. Moreover, lipid segregation takes place between the anionic and zwitterionic lipids in the membranes due to a preferential interaction of FS with phosphatidylserines. The excipient counteracts this favored interaction without affecting the drug affinity and location in the bilayer. This work illustrates that preferential interactions with lipids can be involved in passive drug permeation mechanisms and gives evidence of a possible nonpassive role of certain excipients in the interaction of drugs with membrane lipids.

Keywords

Statin Lipid segregation Drug-membrane interaction Nuclear magnetic resonance Infrared spectroscopy Drug bioavailability 

Notes

Acknowledgments

This work was supported by the Natural Science and Engineering Research Council (NSERC) of Canada, the Fonds Québécois de la Recherche sur la Nature et les Technologies (FQRNT), and the Canadian Foundation for Innovation (CFI). G.L. is grateful to the NSERC for the award of an M.Sc. scholarship. The authors wish to thank J.-P. Gaudet, M. Crepel, and P. Brisebois for technical assistance. P. Gosselin and Y. Roy (Corealis Pharma) are acknowledged for stimulating discussions and support. A.A.A. and I.M. are members of the CQMF (Centre Québécois des Matériaux Fonctionnels).

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Copyright information

© European Biophysical Societies' Association 2010

Authors and Affiliations

  • Germain Larocque
    • 1
    • 2
  • Alexandre A. Arnold
    • 1
  • Étienne Chartrand
    • 1
  • Yves Mouget
    • 2
  • Isabelle Marcotte
    • 1
  1. 1.Department of Chemistry, Pharmaqam/NanoQAMUniversité du Québec à MontréalMontrealCanada
  2. 2.Corealis Pharma Inc.LavalCanada

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