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Computational Dehydration of Crystalline Hydrates Using Molecular Dynamics Simulations
Anders S Larsen1, Jukka Rantanen1, Kristoffer E Johansson1
1Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
Journal of Pharmaceutical Sciences
|November 20, 2016
Summary
Molecular dynamics simulations reveal that the rate of water removal influences the dehydration outcome of ampicillin trihydrate. Slow dehydration yields a crystalline anhydrate, while fast dehydration results in an amorphous structure.
Area of Science:
- Biomedical Sciences
- Computational Chemistry
- Materials Science
Background:
- Molecular dynamics (MD) simulations are increasingly vital in biomedical research.
- Studying hydrate dehydration is crucial for understanding material transformations.
Purpose of the Study:
- To develop a general method for studying hydrate dehydration using MD simulations.
- To investigate the dehydration process of ampicillin trihydrate.
Main Methods:
- Utilized MD simulations to model the dehydration of ampicillin trihydrate.
- Constructed a simulation cell with ampicillin trihydrate and water molecules.
- Varied computational dehydration rates to observe structural changes.
Main Results:
- Different dehydration rates led to distinct structural outcomes: amorphous or crystalline anhydrate.
- Slow dehydration (3 water molecules/10 ps) produced a crystalline anhydrate.
- Fast dehydration (10 water molecules/10 ps) resulted in an amorphous system.
- An intermediate amorphous phase was identified during the dehydration process.
Conclusions:
- The computational dehydration rate significantly impacts the final structure of ampicillin anhydrate.
- The simulated anhydrate structure may represent a kinetically trapped intermediate.
- MD simulations provide real-time insights into complex dehydration pathways.
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