Micrometer-sized rodlike structure formed by the secondary assembly of cyclodextrin nanotube

Wu, Aihua; Shen, Xinghai

doi:10.1016/j.jcis.2006.05.065

Cited by 61 publications

(98 citation statements)

References 47 publications

(67 reference statements)

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“…The largest CD assemblies, whose diameters are up to several micrometers, were formed from β-CD. Transmission electron microscopic (TEM) measurements also showed the formation of spherical assemblies with diameters of 20-130 nanometers from β-and γ-CDs (28,29). Cryo-TEM measurements indicated that β-CD formed disk-and sheet-like structures that were composed of fiber assemblies, in addition to spherical structures, in aqueous solution (27).…”

Section: Formation Of Cyclodextrin Assemblies In Aqueous Solutionmentioning

confidence: 95%

“…The formation of these assemblies was inhibited by chemical modification of the hydroxyl groups of the CDs, the addition of hydrogen-bond-disrupting agents such as urea, and the ionization of the CD hydroxyl groups by increasing the pH of the solutions to above pH 12. The percentages of CD molecules participating in the formation of assemblies are very low: 0.8% and 0.02% in 12 mM aqueous solutions of α-and γ-CDs (26,32), respectively, and 0.0011% in 10 mM β-CD solution (29).…”

Section: Formation Of Cyclodextrin Assemblies In Aqueous Solutionmentioning

confidence: 98%

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Formation and Function of Nano- and Microstructures by the Self-assembly of Cyclic Oligosaccharides ‘Cyclodextrins’

Kida

2011

TIGG

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Recently, much attention has been paid to studies on nano-and microstructures formed by the self-assembly of cyclodextrins (CDs) in the fields of supramolecular chemistry and material science. CDs can adopt various types of assembly modes in aqueous solution, as well as crystal structures. Channel-type assemblies of γ-CD (γ-CD channel ) formed unique micrometer-sized cubes and rods. By using γ-CD channel as a host, the inclusion of guest molecules dissolved in oils, which has been believed to be impossible, can be realized. Furthermore, γ-CD channel showed excellent oil dispersion, and formed organogels in a variety of oils and organic solvents at ambient temperature. This article reviews the formation behavior and function of nano-and microstructures formed by the self-assembly of CDs. A. IntroductionCyclodextrins (CDs), which are produced from starch by the action of cyclodextrin glucanotransferase, are a class of cyclic oligosaccharides consisting of several α-(1,4)-linked D-glucopyranose units (Fig. 1). CDs composed of 6, 7, and 8 glucosidic units are called α-, β-, and γ-CDs, respectively, and have been used extensively. They have a cavity of sub-

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Section: Formation Of Cyclodextrin Assemblies In Aqueous Solutionmentioning

confidence: 95%

Section: Formation Of Cyclodextrin Assemblies In Aqueous Solutionmentioning

confidence: 98%

Formation and Function of Nano- and Microstructures by the Self-assembly of Cyclic Oligosaccharides ‘Cyclodextrins’

Kida

2011

TIGG

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“…[1][2][3][4][5] CDs were studied for their potential use to molecular devices and machine functional materials. [6][7][8][9] The micrometre-sized rod-like structure constructed via secondary self-assembly of b-CD nanotube induced by guest molecule has been reported by Wu et al [10] The bundle-shaped nano supramolecular architectures are developed when the CD and C 60 molecules are linked to form inclusion complexes. [11] During the synthesis of supramolecular nanorod aggregates in an aqueous solution, the nanorod dissociates to form into vesicle structures due to the CD introduction.…”

Section: Introductionmentioning

confidence: 92%

“…This is also demonstrated by Wu and co-workers. [10] Further, the unequal morphologies of SDIII with CDs suggest that the complexes are self-assembled by irregular arrangement of non-covalent complexes. [3,41] Figure S2 (available as supplemental data in the online version) shows the FT-IR spectra of SDIII, SDIV, a-CD, b-CD and the inclusion complexes.…”

Section: Nanomaterials Structure Observation By Sem and Temmentioning

confidence: 99%

Nanorod formation of cyclodextrin-covered sudan dyes through supramolecular self-assembly

Sankaranarayanan

Rajendiran

2013

Journal of Experimental Nanoscience

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Cyclodextrin-covered sudan III (SDIII) and sudan IV (SDIV) dyes produced various nanostructures such as pseudorotaxanes through supramolecular self-assembly, studied by absorption, fluorescence, time-resolved fluorescence, SEM, TEM, FT-IR, DSC, PXRD and 1 H NMR. Solvent study shows that azo-hydrazo tautomer is present in sudan dyes. Absorption and fluorescence spectroscopy data gave evidence for the formation of 1:2 inclusion complexes. Big nanorod ($36 nm) surrounded by small nanorod ($3 nm) was identified in SDIV/a-CD complexes. This confirms that the rigid molecular nanorod aggregates of a-CD and b-CD complexes are formed through the initial formation of smaller nanorods. An unequal morphology noticed in SDIII/CD suggests that the 1:2 inclusion complexes were self-assembled into irregular arrangement. The thermodynamic parameters (DH, DG and DS) of inclusion processes were determined from semi-empirical PM3 calculations.

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“…0.8% (0.096 mM) assuming coils or 0.001% (0.12 μM) considering spheres [29]. For other CDs, the mass contribution of aggregates is also residual, i.e., 0.0011% (0.13 μM) for β-CD [47] and 0.02% (0.154 mM) for γ-CD solutions [45]. He et al [48] found a bimodal distribution in dynamic light scattering (DLS) data of α-, β-, and γ-CD aqueous solutions, with mean hydrodynamic radii of less than 1 nm and higher than 60 nm for the fast and slow components (attributed to monomer and aggregated CDs, respectively).…”

Section: Controversial Experimental Evidencementioning

confidence: 99%

Aggregation of Cyclodextrins: Fundamental Issues and Applications

Cova¹,

Cruz²,

Valente³

et al. 2018

Cyclodextrin - A Versatile Ingredient

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The aggregation of cyclodextrins (CD) in aqueous solution is an old, yet still vastly unexplored topic that has been studied at least since the 1980s. At that time, few authors took into consideration the possibility of formation of aggregates for the interpretation of thermodynamic and thermophysical properties of CDs in aqueous solution. The aggregates appear at quite low CD concentrations and seem to encompass only a small number of CD molecules. They also occur in water in the presence of hydrophobic or amphiphilic moieties, including surfactants, assuming a preassembled state with the hydrophobic chains threading through one or two CDs. After a long period in which it has been neglected, CD aggregation is now a hot topic and one far from gathering consensus. In this chapter, a timely and critical review on the phenomenon of CD aggregation and the respective supramolecular properties, including some computational rationales, will be presented. A comprehensive summary of CD aggregates studied to date, indicating the formation conditions, characterization techniques, and applications, is also provided.

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Micrometer-sized rodlike structure formed by the secondary assembly of cyclodextrin nanotube

Cited by 61 publications

References 47 publications

Formation and Function of Nano- and Microstructures by the Self-assembly of Cyclic Oligosaccharides ‘Cyclodextrins’

Formation and Function of Nano- and Microstructures by the Self-assembly of Cyclic Oligosaccharides ‘Cyclodextrins’

Nanorod formation of cyclodextrin-covered sudan dyes through supramolecular self-assembly

Aggregation of Cyclodextrins: Fundamental Issues and Applications

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