Versatility of cyclodextrins in self-assembly systems of amphiphiles

Interactions between Bio-Based Compounds and Cyclodextrins

“…The hydrophilic exterior usually imparts CDs and their complexes, considerable solubility in water. The charge and polarity of the guest molecule play also an important role in the CD-substrate host-guest interaction [2]. However, this aspect is obviously less important than the geometric fitting.…”

“…Also from group II, surface tension has also been used to follow the effect of CDs on the aggregation and interfacial properties of surfactants in CD-surfactant-containing solutions [74] Phase solubility studies Cabreuva essential oil + HP-β-CD [74] Phase solubility studies β-caryophyllene + HP-β-CD [76] UV-vis Black pepper essential oil + HP-β-CD [76] Phase solubility studies CDs 1 + PPs 2 [77] Phase solubility studies, NMR, TGA, DSC β-CD + estragole [78] NMR β-CD + eugenol [27] NMR β-CD + rosmarinic acid [75] NMR Cyclohexylacetic acid + β-CD Phase solubility studies, NMR, HPLC Polymethoxyflavones + HP-β-CD [93] GC, total organic carbon, phase-solubility studies SBE-β-CD, SBE-γ-CD and HP-β-CD + EOS 6 [94,95] 1 CDs: alpha-cyclodextrin (α-CD), beta-cyclodextrin (β-CD), gamma-cyclodextrin (γ-CD), 2-hydroxypropyl-β-cyclodextrin (HP-β-CD), randomly methylated-beta-cyclodextrins (RAMEB), low methylated beta-cyclodextrin (CRYSMEB), and sulfobutylether β-cyclodextrin (SBE-β-CD) 2 PPs: trans-anethole, estragole, eugenol, isoeugenol (phenylpropenes), caffeic acid, p-coumaric acid, and ferulic acid (hydroxycinnamic acids) 3 UAS: ultrasonic attenuation spectroscopy APGs: glucopyranosides (octyl G8, decyl G10, dodecyl G12, tetradecyl G14) and two maltosides (decyl M10, dodecyl M12) 5 EOs: essential oils of cedarwood, clove, eucalyptus, and peppermint 6 EOS: essential oils of Artemisia dracunculus, Citrus reticulata Blanco, Citrus aurantifolia, Melaleuca alternifolia, Melaleuca quinquenervia, and Rosmarinus officinalis cineoliferum Table 2. Compilation of the most relevant techniques used to study the interactions between CDs and bio-based compounds.…”

Soft aggregates formed by a nonionic phytosterol ethoxylate and β-cyclodextrin in aqueous solution

“…This is mainly due to the fact that the hydrophobic moieties of the fatty acids were covered with the CD's hydrophilic exterior. Since then, many researchers have focused their studies on the formation of supramolecular polymers, which were formed through intermolecular inclusion between CDs and small molecules, especially surfactants [8,10]. With this approach, Viguerie et al developed new nonionic sugar surfactants based on inclusion behaviors between CDs and fatty alcohols or fatty acids [13].…”

“…The three common forms of CDs, ␣-, ␤-, and ␥-CD, contain six, seven, and eight glucose units, respectively [6]. Their unique torus shaped structures with a hydrophobic cavity and a hydrophilic exterior enable themselves to capture a variety of inorganic and organic compounds, especially the surfactants, into their cavities [7][8][9][10][11]. Normally, the hydrophobic chains of amphiphiles could be included to form host-guest complexes in 1:1 or 2:1 stoichiometries with high binding constants [10].…”

Dielectric relaxation behavior of SDS/β-CD organized self-assembly in dilute aqueous solution

“…CDs are able to form host-guest complexes with many surfactants [1][2][3], which has become a focus of attention in self-assembly research. Jang [4][5][6][7][8] designed and performed a series of experiments with CD-based host-guest systems, and found that CDs served as destructive modulators, constructive modulators, and unamphiphilic building units. At the same time, the microstructures of surfactant molecule self-organized assemblies under different conditions are academically researched by means of NMR spectroscopy, small-and wide-angle X-ray scattering (SAXS, WAXS), neutron scattering, infrared spectroscopy, confocal laser scanning microscopy (CLSM), atomic force microscopy (AFM), freeze-fracture transmission electron microscopy (FF-TEM), and so on [9][10][11][12][13][14][15].…”