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Structure-property relationships on recrystallized β-cyclodextrin solvates: A focus on X-ray diffractometry, FTIR and
Mihai A Medeleanu1, Daniel I Hădărugă1, Cornelia V Muntean2
1Department of Applied Chemistry, Organic and Natural Compounds Engineering, Polytechnic University of Timişoara, Carol Telbisz 6, 300001, Timişoara, Romania.
Carbohydrate Polymers
|May 10, 2021
Summary
Solvent properties significantly impact beta-cyclodextrin (β-CD) crystal characteristics. Optimal recrystallization using ethanol-water mixtures yields high crystallinity index (CI) for improved β-CD preparation and complexation.
Area of Science:
- Pharmaceutical Sciences
- Materials Science
- Physical Chemistry
Background:
- Beta-cyclodextrin (β-CD) is a versatile host molecule with applications in drug delivery and purification.
- Controlling the crystalline properties of β-CD is crucial for optimizing its performance in various applications.
- Solvent choice during recrystallization is a key factor influencing the solid-state properties of β-CD.
Purpose of the Study:
- To investigate the effect of alcohol-water solvent mixtures on the recrystallization of β-cyclodextrin.
- To establish quantitative structure-property relationships (QSPRs) between solvent properties and β-CD crystal characteristics.
- To identify optimal solvent systems for enhanced β-CD preparation, purification, and complexation.
Main Methods:
- Recrystallization of β-CD from various alcohol-water mixtures.
- Determination of crystallinity index (CI) using X-ray diffractometry.
- Analysis of solvent hydrophobicity (logP) and dielectric constant.
- Characterization of β-CD crystal properties using X-ray diffractometry, infrared spectroscopy, and thermal analyses.
Main Results:
- Recrystallization from ethanol-water (1:4, v/v) yielded β-CD with a high CI of 99.4(±5.9)%.
- A parabolic relationship was observed between the CI and the logP of the alcohol solvent (r² = 0.998).
- Solvent parameters were demonstrated to significantly influence β-CD crystal characteristics, confirmed by multiple analytical techniques.
Conclusions:
- Solvent properties, particularly hydrophobicity and dielectric constant, are critical for controlling β-CD crystallinity.
- Ethanol-water mixtures are effective for producing highly crystalline β-CD.
- The established QSPRs provide valuable insights for optimizing β-CD preparation and complexation processes.
Keywords:
Fourier-transform infrared spectroscopyPowder X-ray diffractometryPrincipal component analysisStructure-property relationshipsThermal analysisβ-Cyclodextrin recrystallizationMore Related Videos
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