Posted by All these studies utilize the high solubilizing effect of 2,6-di-O-methyl beta-cyclodextrin studying various model drugs.
The compatibility, inclusion stability, and solubility of Allicin with three types of cyclodextrins (β-cyclodextrin (β-CD), hydroxypropyl-β-cyclodextrin (HP-β-CD), and 2,6-dimethyl-β-cyclodextrin (DM-β-CD)) were studied, using molecular simulation and experimental methods [1]. Compared with pure Allicin, the solubility of Allicin increased by 5.6 times, 17.59 times, and 12 times in the Allicin/β-CD IC, Allicin/DM-β-CD IC, and Allicin/HP-β-CD IC, respectively. Inclusion stability constant (Ks) value for Allicin/DM-β-CD IC was the highest at 1555.9 M−1. These results indicate that the Allicin/DM-β-CD ICs exhibit the best stability, which is consistent with the simulation findings.
Demonstrative calculations were carried out using literature data on binding constants, previously determined by the authors using affinity capillary electrophoresis, for betulin 3,28-diphthalate and 3,28-disuccinate with six cyclodextrins: β-cyclodextrin (β-CD), hydroxypropyl-β-CD, randomly methylated β-CD, dimethyl-β-CD, γ-CD, and hydroxypropyl-γ-CD [2]. It was shown that for calculating solubility at high values of binding constants it is important to use not the total concentration of the solubilizer in solution, but its equilibrium concentration.
In this study, the inclusion complexation of Avibactam with various CDs was examined through molecular dynamics (MD) simulations, experimental isothermal titration calorimetry (ITC), and non-covalent interaction (NCI) analysis [3]. Stable 1:1 inclusion complexes were observed between Avibactam and β-cyclodextrin (β-CD), 2,6-dimethyl-β-cyclodextrin (DM-β-CD), and 2-hydroxypropyl-β-cyclodextrin (HP-β-CD), with standard Gibbs free energies of binding (ΔG°) of –3.64, –3.24, and –3.11 kcal/mol, respectively.
Thethermodynamic aspects of Nifuratel solubility improvement in the cyclodextrins solutions were thoroughly investigated [4]. Two-component and three-component solid dispersions of Nifuratel with cyclodextrin (DIMEB) and polymer (PVP) were prepared and fully characterized. The maximal increase in both the dissolution and permeation rates was achieved for the three-component NFT/DIMEB/PVP solid dispersion.
Two surfactants (sodium lauryl sulfate and polyoxyethylene sorbitan monooleate (Tween 80)), and three cyclodextrins (CDs: β-CD, 2-hydroxypropyl-β-CD, and dimethyl-β-CD) were studied as co-solvents by measuring the solubilities of naringin at 298.15 K using high-performance liquid chromatography in water/co-solvent mixtures [5]. The stability constants of the co-solvent/solute systems were evaluated by the Higuchi–Connors solubility method. According to these results, dimethyl-β-CD had the highest co-solvent effect among the CDs.
Referemnces_:
[1] Song, M., Song, J., Zhang, S., Hu, Z., Cui, Y., Liu, Y., Cao,F., Wang, L., Qin, Q., Jiao, M. (2025) Enhancing Allicin bioavailability by way of cyclodextrin encapsulation: simulation and experiments. Green Materials; https://doi.org/10.1680/jgrma.25.00024
[2] Sursyakova, V.V., Rubaylo, A.I. (2025) Theoretical Calculation of the Solubility and Other Parameters for Poorly Water-Soluble Compounds from Binding Constants of Inclusion Complexes: The Examples of Betulin Derivatives with Cyclodextrins. J Solution Chem 54, 850–863. https://doi.org/10.1007/s10953-025-01450-7
[3] Alcázar, J.J., Campodónico, P.R., López, R. (2025) Avibactam–Cyclodextrin Inclusion Complexes: Computational and Thermodynamic Insights for Drug Delivery, Detection, and Environmental Scavenging. Molecules 30, 3401. https://doi.org/10.3390/molecules30163401
[4] Volkova, T.V., Simonova, O.R., Perlovich, G.L. (2025) Improvement of solubility, dissolution and permeation of nifuratel: Thermodynamic aspects and kinetic studies. Colloids and Surfaces A: Physicochemical and Engineering Aspects 727, Part 1, 137991.
https://doi.org/10.1016/j.colsurfa.2025.137991.
[5] Matsuda, H., Kosuge, M., Yoshimura, R. et al. (2025) Determination of the Effects of Surfactants and Cyclodextrins as Co-solvent on the Solubility of Poorly Water-Soluble Flavonoid Naringin. J Solution Chem 54, 626–640. https://doi.org/10.1007/s10953-025-01442-7