Abstract
The main objective of this study is to encapsulate the serotonin hydrochloride (SER) molecule, as an important neurotransmitter, into the 2-hydroxypropyl-β-cyclodextrin (2-HP-β-CD) binding cavity. The results indicate the formation of the photo-stable 2-HP-β-CD:SER inclusion complex with the stoichiometry ratio of 1:1 (AL type) as an enthalpy-driven process. The complex was extensively characterized by using various spectroscopic techniques (FT-IR, 1H-NMR, XRD and ICD), scanning electron microscopy (FE-SEM), and thermal methods (TGA, DTG and DTA). Besides, molecular docking and molecular dynamics simulations were applied. In those simulations, explicit solvation models, emphasizing the role of the van der Waals forces and H-bonds in the complex formation were applied. Furthermore, the hydroxyl group of SER was found to be localized at the vicinity of the 2-HP-β-CD secondary rim. The study confirmed the possibility of utilizing this formulation as a CNS-active compound with improved solubility and stability to treat some behavioral dysfunctions and mental disorders.
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Abbreviations
- 2-HP-β-CD:
-
2-Hydroxypropyl-β-cyclodextrin
- DTG:
-
Differential thermal gravimetric
- DTA:
-
Differential thermal analysis
- EE:
-
Efficiency of encapsulation
- FE-SEM:
-
Field emission scanning electron microscopy
- FT-IR:
-
Fourier-transform infrared spectroscopy
- GAFF:
-
General amber force field
- ICD:
-
Induced circular dichroism
- IC:
-
Inclusion complex
- MD:
-
Molecular dynamics
- MM-GBSA:
-
Molecular mechanics generalized Born surface area
- MM-PBSA:
-
Molecular mechanics Poisson–Boltzmann surface area
- XRD:
-
X-ray diffraction
- RMSD:
-
Root-mean-square deviation
- RMSF:
-
Root-mean-square fluctuation
- RDF:
-
Radial distribution function
- 1H-NMR:
-
Hydrogen nuclear magnetic resonance spectroscopy
- SASA:
-
Solvent accessible surface area
- SER:
-
Serotonin hydrochloride
- TGA:
-
Thermal gravimetric analysis
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The authors gratefully acknowledge the Research Council of Isfahan University for financial support.
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Fateminasab, F., Bordbar, A.K., Shityakov, S. et al. Comprehensive Physico-Chemical Characterization of a Serotonin Inclusion Complex with 2-Hydroxypropyl-β-Cyclodextrin. J Solution Chem 49, 915–944 (2020). https://doi.org/10.1007/s10953-020-00997-x
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DOI: https://doi.org/10.1007/s10953-020-00997-x