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As a natural cyclic oligosaccharide, β-Cyclodextrin with cavity structure has excellent water solubility and biocompatibility, which makes it highly valuable in the field of supramolecular self-assembly. Although the self-assembly of β-Cyclodextrin into supramolecular gels has been reported by our group, the impact of metal ions on β-Cyclodextrin supramolecular gels has not yet been studied. Herein, a β-Cyclodextrin supramolecular gel was prepared firstly and then the effects of six different metal ions on this gel system were investigated systematically. It was found that tubular stacking induced by hydrogen bond is the main driving force for the self-assembly of β-Cyclodextrin into β-Cyclodextrin supramolecular gels. Moreover, the introduction of metal ions did not hinder the formation of β-Cyclodextrin supramolecular gels. On the contrary, the metal coordination interaction between metal ions and β-Cyclodextrin stabilized the tubular stacking state of β-Cyclodextrin, thereby promoting the formation of β-Cyclodextrin supramolecular gels. This research not only deepens the study of β-Cyclodextrin supramolecular gels but also lays a solid foundation for their application in intelligent materials, drug delivery, and ion channels, among other fields. [Display omitted] [ABSTRACT FROM AUTHOR]

Temozolomide is a potent chemotherapeutic agent for glioblastoma multiforme treatment. However, its low aqueous solubility and short half-life (only about 1.8 h) in plasm limit its clinical therapeutics. Herein, a supramolecular vesicle based on hydroxypropyl-β-cyclodextrin and temozolomide was firstly constructed by elaborate design and preparation, which can load temozolomide into membranous layer of vesicle effectively. The morphologies and diameters of this temozolomide-loaded vesicle were characterized through transmission electron microscope, scanning electron microscope, and dynamic light scattering. The possible vesicle formation mechanism was further studied by X-ray diffraction, Fourier transform infrared spectrum, ultraviolet-visible spectroscopy, 1H nuclear magnetic resonance, and 2D nuclear magnetic resonance (ROSEY). Finally, the stimulus responsiveness of this vesicle was studied. Temozolomide can be released from the membrane of the vesicle once copper ions were dropped into the vesicle solution.Herein, a novel supramolecular vesicle based on hydroxypropyl-β-cyclodextrin and temozolomide was constructed by elaborate design and preparation, which can load temozolomide into membranous layer of vesicle effectively. Moreover, hydroxypropyl-β-cyclodextrin/temozolomide vesicles exhibit sensitive stimulus responsiveness to copper ions since vesicles will change to irregular aggregates when copper ions are added into this vesicle system. [ABSTRACT FROM AUTHOR]

Curcumin is a safe and nontoxic natural potential antitumor drug. However, its extremely low aqueous solubility severely limits its clinical application. We designed a supramolecular curcumin vesicle based on different curcumin-cyclodextrin amphiphiles, which could greatly enhance the aqueous solubility of curcumin up to 7000-fold. The vesicles can exist for about one month in aqueous solution at around 20 °C, showing a certain colloidal stability. The curcumin-β-cyclodextrin vesicles were identified by transmission electron microscopy (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM), and dynamic light scattering (DLS). X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), UV–vis spectrum and 1 H NMR were further employed to study the formation mechanism of the vesicles. Curcumin vesicles were also prepared when different host molecules were employed as the hydrophilic heads of the supramolecular amphiphiles. Finally, curcumin could be controllably released with the disruption of the vesicles when the external stimuli, including competitive guest molecules, enzymes and copper ions were added into the vesicles system. [ABSTRACT FROM AUTHOR]

A new method was developed to construct a special amido bond in the presence ofβ-cyclodextrin. This process is similar to peptide synthesis in organisms. NMR experiments were performed to investigate the possible mechanism. This work has potential application in biomimetic peptide synthesis. [Supplementary materials are available for this article. Go to the publisher's online edition ofSynthetic Communications® for the following free supplemental resource(s): Full experimental and spectral details.] [ABSTRACT FROM AUTHOR]

Anisotropic and well-defined β-cyclodextrin (β-CD) and sodium laurate (SL) gel fibers, with tetragonal and lamellar packing modes respectively, were combined to generate orthogonal and switchable assemblies for the first time. Through controlling the inclusion–exclusion processes between β-CD and SL by changing external stimuli, β-CD gel fibers, SL gel fibers and their coexistence states can be easily tailored. Different assembled states exhibited versatile morphologies and microstructures, which were detected by microscopy and X-ray scattering measurements. Furthermore, controllable assemblies provide facile ways to control the mechanical properties of the hybrid gels. The orthogonal self-assembly with self-sorting properties would enable this system to attract interest in material science. [ABSTRACT FROM AUTHOR]

Abstract: Vesicles constructed by supramolecular amphiphiles are considered as more promising stimuli-responsive vehicles for carrying and delivering targeted molecules. In this research, novel supramolecular amphiphiles are directly assembled from UR-144, a general neuropathic drug, and a class of mono-diaminoalkane substituted β-cyclodextrins. In the aqueous solution, the supramolecular amphiphiles can assemble into vesicular particles, which were characterized in detail by transmission electron microscopy (TEM), atomic force microscopy (AFM), scanning electron microscopy (SEM) and dynamic light scattering (DLS). The mechanism was also suggested based on the NMR, Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) experimental results. The vesicular particles tend to be damaged upon the addition of Cu2+ and meanwhile release UR-144. [Copyright &y& Elsevier]

Just as biological behaviors that can be tuned by salt ions, salt-containing soft materials are of great importance in various fields. Here we report a supramolecular cyclodextrin gel, of which properties including gelation behavior, fiber size, thermal stability as well as mechanical strength could be well tailored by inorganic salts. The concentrations, types of alkali salts were tested and had a profound impact on the gel properties. The formation/collapse behaviors and variations of gel fiber size were characterized through scanning electron microscopy (SEM), transmission electron microscopy (TEM) and optical microscopy (OM). Infrared spectroscopy (IR), differential scanning calorimetry (DSC) and small angle X-ray scattering (SAXS) revealed the mechanism of molecular arrangement and provided insight into the outstanding salt effects. This might have potential applications in designing novel smart materials and provide a new course of constructing multi-morphological gels by salts. [ABSTRACT FROM AUTHOR]

Highlights: [•] A fenspiride/β-CD complex was prepared and characterized in detail. [•] An enzyme-responsive assembly system was constructed. [•] The system included reversible control of formation and disruption of vesicles. [ABSTRACT FROM AUTHOR]