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Updated: Jun 14, 2025
Encapsulation of Cancer Therapeutic Agent Dacarbazine Using Nanostructured Lipid Carrier
Published on: April 26, 2016
Evaluating Theoretical Solvent Models for Thermodynamic and Structural Descriptions of Dacarbazine-Cyclodextrin
Zdzisław Kinart1, Marta Hoelm1, Martyna Imińska1
1Department of Physical Chemistry, Faculty of Chemistry, University of Lodz, Pomorska 163/165, 90-236 Lodz, Poland.
This study evaluated implicit solvent models for dacarbazine-cyclodextrin complexes. The Solvation Model based on Density (SMD) best matched experimental data for thermodynamic properties, particularly for HE-β-CD complexes.
Area of Science:
- Computational Chemistry
- Supramolecular Chemistry
Background:
- Dacarbazine is an anticancer drug.
- Cyclodextrins (CDs) are used to improve drug solubility and stability.
- Understanding drug-CD complexation is crucial for pharmaceutical development.
Purpose of the Study:
- To evaluate the influence of implicit solvent models on dacarbazine-cyclodextrin complex properties.
- To compare theoretical thermodynamic data with experimental results.
- To identify the most stable dacarbazine-cyclodextrin complex and the best-performing solvent model.
Main Methods:
- Computational modeling using four implicit solvent models: Polarizable Continuum Model (PCM), Conductor-like Polarizable Continuum Model (CPCM), Solvation Model based on Density (SMD), and Onsager model.
- Analysis of structural and thermodynamic properties of dacarbazine complexes with α-CD, HP-β-CD, and HE-β-CD.
- Comparison of theoretical results with experimental data from conductometric studies.
Main Results:
- All three cyclodextrins formed stable 1:1 inclusion complexes with dacarbazine.
- Complexes with HE-β-CD exhibited the highest thermodynamic stability.
- The choice of solvent model significantly impacted thermodynamic parameters but had a minor effect on structural properties.
- The SMD model showed the best agreement with experimental data, especially for Gibbs free energy of solvation.
Conclusions:
- Implicit solvent models significantly influence the calculated thermodynamic properties of dacarbazine-cyclodextrin complexes.
- The SMD model provides the most accurate theoretical prediction of these properties compared to experimental data.
- HE-β-CD is the most effective cyclodextrin for forming stable dacarbazine inclusion complexes.
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