Related Experiment Videos
Diffusion-limited kinetics of the solution-solid phase transition of molecular substances
Dimiter N Petsev1, Kai Chen, Olga Gliko
1Department of Chemical Engineering, University of Houston, Houston, TX 77204, USA.
Summary
Protein crystallization kinetics are diffusion-limited, not solely determined by transition states. Experiments with ferritin and apoferritin confirm this, suggesting broad applicability across molecular substances.
Area of Science:
- Biophysics
- Materials Science
- Chemical Kinetics
Background:
- Understanding the kinetics of solution-solid phase transitions is crucial for controlling crystallization.
- Distinguishing between diffusion-limited and transition state-limited kinetics is key to elucidating phase transition mechanisms.
Purpose of the Study:
- To critically assess whether diffusion-limited kinetics govern the solution-solid phase transition of molecular substances.
- To differentiate between diffusion-limited and transition state-limited mechanisms in protein crystallization.
Main Methods:
- Performed comparative crystallization experiments using ferritin and apoferritin, proteins with identical shells but differing molecular masses.
- Analyzed the kinetic coefficient for crystallization for both protein types.
Main Results:
- The kinetic coefficient for crystallization was found to be identical (within 7% accuracy) for both ferritin and apoferritin.
- This identity in kinetic coefficients strongly indicates diffusion-limited kinetics for their crystallization.
Conclusions:
- The crystallization of ferritin and apoferritin is governed by diffusion-limited kinetics.
- Data suggest that solution-phase transitions for a wide range of materials, including small molecules, proteins, and viruses, are predominantly diffusion-limited.