On the supramacromolecular structure of core–shell amphiphilic macromolecules derived from hyperbranched polyethyleneimine

Picco, Agustín Silvio; Kraska, Martin; Didzoleit, Haiko; Appel, Cristian; Silbestri, Gustavo F.; Azzaroni, Omar; Stühn, Bernd; Ceolı́n, Marcelo

doi:10.1016/j.jcis.2014.06.034

Cited by 7 publications

(4 citation statements)

References 50 publications

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“…Certainly, scattering simulations results of a hypothetical micellar model (see below) implied that such a node of the form factor F at 1nm -1 is formed (see Fig 8 below). On the other hand, it should be noticed that other hexagonal systems not following the canonical distribution of intensity of the peaks has been reported [35,36]. These last systems are similar to our case in the fact that the peak 110 is of the highest intensity whereas the peak 100 is very weak.…”

Section: Discussionsupporting

confidence: 88%

Hexagonal phase with ordered acyl chains formed by a short chain asymmetric ceramide

Dupuy

Bordín

Maggio

et al. 2017

Colloids and Surfaces B: Biointerfaces

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Ceramides constitute a group of lipids with usually high melting temperature that also favor negative curvature in membranes when mixed with other lipids. The short chain C10:0 ceramide is an asymmetric lipid which consists of an 18 carbon sphingosine base N-acylated with decanoic acid. According to high sensitivity differential scanning calorimetry, it shows a minor exothermic peak at 61°C and a main endothermic transition at 75°C. By small angle X-ray scattering and polarized light microscopy we found that, at temperatures below the main transition, the fully hydrated lipid dispersions are arranged in a tridimensional structure corresponding to an inverted hexagonal phase. Infrared spectroscopy and wide angle X-ray diffraction indicated that the acyl chains of ceramides exhibit a relatively high order in the hexagonal phase. As far as we know, this is the first report of a lipid hexagonal phase having highly ordered acyl chains. Molecular asymmetry due to the different length of the sphingosine and the N-acyl chains of C10:0 ceramide may explain why this novel phase is formed.

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Section: Discussionsupporting

confidence: 88%

Hexagonal phase with ordered acyl chains formed by a short chain asymmetric ceramide

Dupuy

Bordín

Maggio

et al. 2017

Colloids and Surfaces B: Biointerfaces

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“…Further, it is known that the A-W interface can facilitate the formation of welldefined thin films of soft matter. 13 At the A-W interface, studies on CEs have shown that short chain esters form stable monolayers; higher homologues form stable or unstable a) E-mail: suresh@cens.res.in fluidic bilayers, crystalline bilayers, and three-dimensional (3D) structures. 6,7,14 These studies were based on surface manometry, Brewster angle microscopy, reflection, and epifluorescence microscopy.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly and molecular packing in cholesteryl esters at interfaces

Sarkar

Suresh

2017

The Journal of Chemical Physics

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To understand the self-assembly and molecular packing in cholesteryl esters relevant to biological processes, we have studied them at the air-water and air-solid interfaces. Our phase and thickness studies employing imaging ellipsometry and atomic force microscopy along with surface manometry show that the molecular packing of cholesteryl esters at interfaces can be related to Craven's model of packing, given for bulk. At the air-water interface, following Craven's model, cholesteryl nonanoate and cholesteryl laurate exhibit a fluidic bilayer phase. Interestingly, we find the fluidic bilayer phase of cholesteryl laurate to be unstable and it switches to a crystalline bilayer phase. However, according to Craven, only cholesteryl esters with longer chain lengths starting from cholesteryl tridecanoate should show the crystalline bilayer phase. The thickness behavior of different phases was also studied by transferring the films onto a silicon substrate by using the Langmuir-Blodgett technique. Texture studies show that cholesterol, cholesteryl acetate, cholesteryl nonanoate, cholesteryl laurate, and cholesteryl myristate exhibit homogeneous films with large size domains, whereas cholesteryl palmitate and cholesteryl stearate exhibit less homogeneous films with smaller size domains. We suggest that such an assembly of molecules can be related to their molecular structures. Simulation studies may confirm such a relation.

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“…3(b) ). The distance between the centres of the cylinders ( a ) of the hexagonal of Au-MS was estimated to be 7.0 nm, 19 which is greater than the corresponding value for Ag-MS (5.5 nm), as shown in Fig. 3(c) .…”

Section: Resultsmentioning

confidence: 58%

Au(i)-, Ag(i)-, and Pd(ii)-coordination-driven diverse self-assembly of an N-heterocyclic carbene-based amphiphile

et al. 2021

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On the supramacromolecular structure of core–shell amphiphilic macromolecules derived from hyperbranched polyethyleneimine

Cited by 7 publications

References 50 publications

Hexagonal phase with ordered acyl chains formed by a short chain asymmetric ceramide

Hexagonal phase with ordered acyl chains formed by a short chain asymmetric ceramide

Self-assembly and molecular packing in cholesteryl esters at interfaces

Au(i)-, Ag(i)-, and Pd(ii)-coordination-driven diverse self-assembly of an N-heterocyclic carbene-based amphiphile

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