Understanding the structural differences between spherical and rod-shaped human insulin nanoparticles produced by
Yeonju Park1, Yongil Seo, Boknam Chae
1Department of Chemistry and Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 200-701 (Korea).
Summary
This study reveals that solvent polarity influences human insulin nanoparticle shape during supercritical fluid synthesis. Different shapes exhibit distinct thermal denaturation mechanisms and hydrogen bonding degrees, impacting nanoparticle properties.
Area of Science:
- Biophysics
- Materials Science
- Chemical Engineering
Background:
- Human insulin nanoparticles are crucial for drug delivery.
- Understanding their thermal stability and structural properties is key to optimizing formulation.
- Supercritical fluid technology offers a novel approach for nanoparticle synthesis.
Purpose of the Study:
- To investigate the thermal denaturation mechanism and secondary structures of human insulin nanoparticles.
- To compare spherical (DMSO) and rod-shaped (EtOH) insulin nanoparticles synthesized via solution-enhanced dispersion by supercritical fluids.
- To elucidate the influence of solvent polarity on nanoparticle morphology and thermal behavior.
Main Methods:
- Temperature-dependent infrared (IR) spectroscopy.
- Principal component analysis (PCA) for spectral data analysis.
- 2D correlation spectroscopy for elucidating molecular structure changes.
- All-atom molecular dynamics (AAMD) calculations for structural and solvent interaction analysis.
Main Results:
- Spherical and rod-shaped insulin nanoparticles exhibit distinct thermal denaturation mechanisms and hydrogen bonding.
- PCA and 2D correlation spectroscopy differentiated the thermal behaviors of the two nanoparticle shapes.
- AAMD calculations revealed geometric differences and the influence of solvent molecules on nanoparticle formation.
- Solvent polarity (DMSO vs. EtOH) was found to influence nanoparticle shape but not necessarily insulin structure/function.
Conclusions:
- Solvent polarity is a critical factor in controlling human insulin nanoparticle morphology during supercritical fluid synthesis.
- The resulting nanoparticle shapes possess unique thermal denaturation pathways and secondary structural characteristics.
- Spectroscopic and computational methods provide comprehensive insights into nanoparticle behavior and formation mechanisms.
Keywords:
2D correlation spectroscopyinsulin nanoparticlesmolecular dynamics simulationprotein structuresolution-enhanced dispersion by supercritical fluids processMore Related Videos
Related Concept Videos
01:30Production of Pharmaceuticals
88
Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under...
88
02:15Protein and Protein Structure
70.9K
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...
A protein's shape is critical to its function. For example, an enzyme...
70.9K