Volume 4 Supplement 1

7th German Conference on Chemoinformatics: 25 CIC-Workshop

Open Access

Molecular modeling of lipid drug formulations

  • Woldeamanuel A Birru1Email author,
  • Dallas B Warren1,
  • Christopher JH Porter1,
  • Colin W Pouton1 and
  • David K Chalmers1
Journal of Cheminformatics20124(Suppl 1):O23

DOI: 10.1186/1758-2946-4-S1-O23

Published: 1 May 2012

Lipid formulations can improve the bioavailability of drugs that have low aqueous solubility. A variety of chemical compounds, including triglyceride oils (lipids), fatty acid esters and surfactants, can be included in lipid formulations. This heterogeneity makes spectroscopic study of the in ternal structure of formulation difficult. Understanding of lipid formulations at a molecular level will greatly improve our knowledge of in vivo dispersion and solubilisation patterns of lipid formulations.

Figure 1

Molecular dynamics studies have provided useful insight into the structure and dynamics of different types of aggregates, including mixed glycerides with and without propylene glycol [1] and bile salts [2]. To date, such studies have not been performed on lipid drug formulations . The objective of this research is to develop a molecular dynamics protocol to examine the interaction between drugs and formulations at the atomic level. To evaluate and parameterize the force field of choice we are calculating Gibbs free energy of solvation of a number of alcohols and short poly -(ethylene glycol) polymers. Following this, the aggregation behaviour of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), sodium glycochenodeoxycholate (GDX), different digestion products and polyethylene glycol surfactants will be investigated. Moreover, the phase diagram s of three component systems composed of i) bile salts, digested products and water and ii) surfactants, lipids and water will be modelled.

Simulations are being performed using the molecular dynamics software suite GROMACS. Calculations are being performed on a high performance computing cluster at the Victorian Life Sciences Com putation Initiative (VLSCI). The methods highlighted in this study will prove to be an essential tool for formulators of lipid systems for oral administration.

Authors’ Affiliations

(1)
Monash Institute of Pharmaceutical Sciences, Monash University

References

  1. Warren DB, Chalmers DK, Pouton CW: Structure and Dynamics of Glyceride Lipid Formulations, with Propylene Glycol and Water. Mol Pharm. 2009, 6: 604-614. 10.1021/mp8001667.View ArticleGoogle Scholar
  2. Warren DB, et al: Molecular Dynamics Simulations of Spontaneous Bile Salt Aggregation. Colloid Surface A. 2006, 280: 182-193. 10.1016/j.colsurfa.2006.02.009.View ArticleGoogle Scholar

Copyright

© Birru et al; licensee BioMed Central Ltd. 2012

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.