Investigation on γ-cyclodextrin nanotube induced by -diphenylbenzidine molecule

Wu, Aihua; Shen, Xinghai; He, Yuanhang

doi:10.1016/j.jcis.2005.11.014

Cited by 73 publications

(78 citation statements)

References 58 publications

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“…The signals in Fig. 1b and d, whose diameter is about 1-2 nm, probably derive from b-CD or the NTf 2 --b-CD inclusion complex [22,23,42]. In addition, LiNTf 2 on its own cannot selfassembly so that no self-assembly signal occurs in Fig.…”

Section: Dls Measurementsmentioning

confidence: 96%

“…In the past several years, our research group aimed to investigate what kinds of organic molecules cause the formation of CD nanotubes, and has found several organic molecules [18][19][20][21][22][23][24][25]. Moreover, we also found the precipitation in the PBD-b-CD, 2,5-bis(5 0 -tert-butyl-2-benzoxazoyl)thiophene (BBOT)-b-CD, and BBOT-c-CD solutions [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Secondary assembly mechanism of cyclodextrin based on LiNTf2@β-CD system

Shi

Shen

2016

J Incl Phenom Macrocycl Chem

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Cyclodextrin-based nanotubes have been widely investigated and their secondary assembly (SA) behavior was found in our previous works. Here we report the self-assembly behavior between lithium bis(trifluoromethylsulfonyl)imide (LiNTf 2 ) and b-cyclodextrin (b-CD). Nanosheet structures with regular shape were obtained in the concentrated LiNTf 2 @b-CD solution. This phenomenon can be explained in terms of the SA mechanism of CD induced by the inorganic guest LiNTf 2 . LiNTf 2 and b-CD firstly forms nanotubes, and the nanotubes further stack with each other to form nanosheets by SA. We confirm that the hydrogen-bonding interaction contributes a lot to the formation of the nanotubes and their SA, and Li ? shows a special effect in the SA by inducing hydrogenbonding network between the adjacent b-CD to regularly pack the nanotubes.

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Section: Dls Measurementsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Secondary assembly mechanism of cyclodextrin based on LiNTf2@β-CD system

Shi

Shen

2016

J Incl Phenom Macrocycl Chem

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“…Dynamic and static light scattering measurements showed that the size of these CD assemblies increased with an increase in the CD concentration in all cases of α-, β-, and γ-CDs (25)(26)(27)(28). The largest CD assemblies, whose diameters are up to several micrometers, were formed from β-CD.…”

Section: Formation Of Cyclodextrin Assemblies In Aqueous Solutionmentioning

confidence: 94%

“…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: 96%

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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“…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). This has been revisited by Puskás et al [49] by using the same technique.…”

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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Investigation on γ-cyclodextrin nanotube induced by -diphenylbenzidine molecule

Cited by 73 publications

References 58 publications

Secondary assembly mechanism of cyclodextrin based on LiNTf2@β-CD system

Secondary assembly mechanism of cyclodextrin based on LiNTf2@β-CD system

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

Aggregation of Cyclodextrins: Fundamental Issues and Applications

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