scholarly journals Protein-mediated gelation and nano-scale assembly of unfunctionalized hyaluronic acid and chondroitin sulfate

F1000Research ◽  
2019 ◽  
Vol 7 ◽  
pp. 1827
Author(s):  
Anthony Tabet ◽  
June Y. Park ◽  
Jarrod Shilts ◽  
Kamil Sokolowski ◽  
Vijay K. Rana ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Tissue Engineering ◽  
Molecular Weight ◽  
Nervous System ◽  
Hyaluronic Acid ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Chondroitin Sulfate ◽  
Self Assembly ◽  
Biological Tissues

Background: Hyaluronic acid (HA) is a major component of the extracellular matrix (ECM) in the central nervous system and the only purely supramolecular glycosaminoglycan. Much focus has been given to using this high molecular weight polysaccharide for tissue engineering applications. In most studies, HA is covalently functionalized with moieties that can facilitate network formation through physical self-assembly, or covalent crosslinking (e.g. photo-catalyzed) as the polysaccharide does not gel on its own. However, these crosslinks are not the driving force of HA self-assembly in biological tissues. Methods: Oscillatory rheology, dynamic light scattering, and scanning electron microscopy were used to study albumin/HA structures. Dynamic light scattering and transmission electron microscopy were used to study albumin/chondroitin sulfate (CS) structures. UV-vis spectroscopy was used to demonstrate the potential for using protein-crosslinked polymers as an ECM-mimetic model to study transport of hydrophilic small molecules. Results: We examine the intermolecular interactions of two major glycosaminoglycans found in the human brain, HA and the lower molecular weight CS, with the model protein albumin. We report the properties of the resulting micro- and nano-materials. Albumin/HA mixtures formed supramolecular gels, and albumin/CS mixtures formed micro- and nanoparticles. These systems are formed from unfunctionalized polysaccharides, which is an attractive and simpler method of forming HA hydrogels and CS nanoparticles than functional chemistry-based approaches such as chemically modifying the polymer backbones. We also summarize the concentrations of HA and CS found in various mammalian brains, which could potentially be useful for biomimetic scaffold development in tissue engineering. Conclusions: Simple preparation and combination of commercially available charged biomacromolecules rapidly result in interesting self-assembled materials with structures at the micron and nanometer length-scales. Such materials may have utility in serving as cost-effective and simple models of nervous system electrostatic interactions and as in vitro drug release and model system for ECM transport studies.

scholarly journals Protein-mediated gelation and nano-scale assembly of unfunctionalized hyaluronic acid and chondroitin sulfate

F1000Research ◽  
2019 ◽  
Vol 7 ◽  
pp. 1827
Author(s):  
Anthony Tabet ◽  
June Y. Park ◽  
Jarrod Shilts ◽  
Kamil Sokolowski ◽  
Vijay K. Rana ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Molecular Weight ◽  
Nervous System ◽  
Hyaluronic Acid ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Chondroitin Sulfate ◽  
Biological Tissues ◽  
Simple Method ◽  
Vis Spectroscopy

Background: Hyaluronic acid (HA) is a major component of the extracellular matrix (ECM) in the central nervous system and the only purely supramolecular glycosaminoglycan. Much focus has been given to using this high molecular weight polysaccharide for tissue engineering applications. In most studies, the backbone of HA is functionalized with moieties that can facilitate network formation through physical self-assembly, or covalent crosslinking (e.g. photo-catalyzed) at concentrations where the polysaccharide does not gel on its own. However, these crosslinks often utilize functional groups not found in biological tissues. Methods: Oscillatory rheology, dynamic light scattering, and scanning electron microscopy were used to study albumin/HA structures. Dynamic light scattering and transmission electron microscopy were used to study albumin/chondroitin sulfate (CS) structures. UV-vis spectroscopy was used to demonstrate the potential for using protein-polymer blends as an ECM-mimetic model to study transport of small molecules. Results: We examine the intermolecular interactions of two major glycosaminoglycans found in the human brain, HA and the lower molecular weight CS, with the model protein albumin. We report the properties of the resulting micro- and nano materials. Our albumin/HA systems formed gels, and albumin/CS systems formed micro- and nanoparticles. These systems are formed from unfunctionalized polysaccharides, which is an attractive and simple method of forming HA hydrogels and CS nanoparticles. We also summarize the concentrations of HA and CS found in various mammalian brains, which could potentially be useful for biomimetic scaffold development. Conclusions: Simple preparation of commercially available charged biomacromolecules results in interesting materials with structures at the micron and nanometer length-scales. Such materials may have utility in serving as cost-effective models of nervous system electrostatic interactions and as in vitro drug release and model system for ECM transport studies.

scholarly journals Supramolecular protein-mediated assembly of brain extracellular matrix glycans

F1000Research ◽  
2018 ◽  
Vol 7 ◽  
pp. 1827 ◽  
Author(s):  
Anthony Tabet ◽  
Kamil Sokolowski ◽  
Jarrod Shilts ◽  
Marlous Kamp ◽  
Nina Warner ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Molecular Weight ◽  
Extracellular Matrix ◽  
Nervous System ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Electrostatic Interactions ◽  
Network Formation ◽  
Biological Tissues ◽  
Vis Spectroscopy

Background: Hyaluronic acid (HA) is the major component of the extracellular matrix in the central nervous system and the only supramolecular glycosaminoglycan. Much focus has been given to using this high molecular weight polysaccharide for tissue engineering applications. In the majority of cases, HA is covalently functionalized with moieties that can facilitate network formation through physical selfassembly, or photo-catalyzed covalent crosslinking as the polysaccharide does not gel on its own. However, these covalent crosslinks are not the driving force of HA self-assembly in biological tissues. Methods: Oscillatory rheology and dynamic light scattering were used to study albumin/HA structures. Dynamic light scattering and transmission electron microscopy were used to study albumin/chondroitin sulfate (CS) structures. UV-vis spectroscopy was used to study mass transfer of a hydrophilic small molecule into the albumin/HA/CS materials. Results: In this work we examine the intermolecular interactions of two major glycans found in the human brain, HA and the lower molecular weight CS , with the protein albumin. We report physiochemical properties of the resulting supramolecular micro- and nanomaterials. Albumin/HA mixtures formed supramolecular gels, and albumin/CS mixtures formed micro- and nanoparticles. We also summarize the concentrations of HA and CS found in various mammalian brains. Conclusions: Simple preparation and combination of commercially available charged biomacromolecules under short time-scales can result in interesting self-assembled materials with structures at the micron and nanometer length-scales. Such materials may have utility in serving as cost-effective and simple models of nervous system electrostatic interactions and as in vitro drug release and mass transfer quantification tools.

Synthesis and properties of multiheaded and multitailed surfactants based on tripentaerythritol

2015 ◽  
Vol 93 (5) ◽  
pp. 502-508 ◽  
Author(s):  
Nawal K. Paul ◽  
Tyler Mercer ◽  
Hussein Al-Mughaid ◽  
D. Gerrard Marangoni ◽  
Michael J. McAlduff ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Surface Tension ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Self Assembly ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Aggregation Behaviour ◽  
Aggregate Structures

The surface and self-assembly properties of a family of multiheaded, multitailed surfactants based on a tripentaerythritol backbone are described. Critical aggregation concentrations of these unusual surfactant systems have been determined from surface tension measurements; aggregate sizes in the presence and absence of a small amount of added electrolyte have been obtained via dynamic light scattering, and the morphologies of the aggregates were examined from electron microscopy measurements. In general, when compared to conventional ionic and two-headed surfactants (and other recently synthesized pentaerythritol derived surfactants from this group), these multiheaded surfactants exhibited some unusual trends in their aggregation behaviour and interesting aggregate structures in aqueous solution, as a function of alkyl chain length.

Directive Effect of Chain Length in Modulating Peptide Nano-assemblies

2020 ◽  
Vol 27 (9) ◽  
pp. 923-929
Author(s):  
Gaurav Pandey ◽  
Prem Prakash Das ◽  
Vibin Ramakrishnan
Keyword(s):  
Electron Microscopy ◽  
Amino Acids ◽  
Light Scattering ◽  
Chain Length ◽  
Self Assembly ◽  
The Self ◽  
Ionic Charge ◽  
Self Assembling ◽  
Biophysical Techniques

Background: RADA-4 (Ac-RADARADARADARADA-NH2) is the most extensively studied and marketed self-assembling peptide, forming hydrogel, used to create defined threedimensional microenvironments for cell culture applications. Objectives: In this work, we use various biophysical techniques to investigate the length dependency of RADA aggregation and assembly. Methods: We synthesized a series of RADA-N peptides, N ranging from 1 to 4, resulting in four peptides having 4, 8, 12, and 16 amino acids in their sequence. Through a combination of various biophysical methods including thioflavin T fluorescence assay, static right angle light scattering assay, Dynamic Light Scattering (DLS), electron microscopy, CD, and IR spectroscopy, we have examined the role of chain-length on the self-assembly of RADA peptide. Results: Our observations show that the aggregation of ionic, charge-complementary RADA motifcontaining peptides is length-dependent, with N less than 3 are not forming spontaneous selfassemblies. Conclusion: The six biophysical experiments discussed in this paper validate the significance of chain-length on the epitaxial growth of RADA peptide self-assembly.

scholarly journals Ferro-self-assembly: magnetic and electrochemical adaptation of a multiresponsive zwitterionic metalloamphiphile showing a shape-hysteresis effect

2021 ◽  
Vol 12 (1) ◽  
pp. 270-281
Author(s):  
Stefan Bitter ◽  
Moritz Schlötter ◽  
Markus Schilling ◽  
Marina Krumova ◽  
Sebastian Polarz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Real Time ◽  
Self Assembly ◽  
Hysteresis Effect ◽  
The Self ◽  
Self Organization ◽  
Stimuli Responsive ◽  
Optical Birefringence

The self-organization properties of a stimuli responsive amphiphile can be altered by subjecting the paramagnetic oxidized form to a magnetic field of 0.8 T and monitored in real time by coupling optical birefringence with dynamic light scattering.

scholarly journals COMPLEXATION OF POLYETHYLENE-GLYCOL WITH THE SODIUM SALTS OF CITRIC AND SUCCINIC ACIDS IN THE AQUEOUS SOLUTIONS. STUDIES BY DYNAMIC LIGHT SCATTERING AND UV/VIS SPECTROPHOTOMETRY

2015 ◽  
Vol 11 (8) ◽  
pp. 3866-3872
Author(s):  
E.A. Masimov ◽  
Etibar Hummat Ismailov ◽  
S.Y. Odzhaqverdiyeva
Keyword(s):  
Molecular Weight ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Aqueous Solutions ◽  
Polyethylene Glycols ◽  
Hydrodynamic Diameter ◽  
Absorption Bands ◽  
Sodium Salts ◽  
And Diffusion ◽  
Formation Of Complexes

Dynamic light scattering (DLS) method in combination with the UV/VIS spectrophotometry is used to study the interaction of polyethylene- glycols with a molecular weight  6000 ( PEG6000 ) with sodium salts of citric and succinic acids in aqueous solutions. The values of density, viscosity, refractive and diffusion indexes, the values of the hydrodynamic diameter, wavelength electronic absorption bands for PEG6000 aqueous solutions, their mixtures with succinic and citric acids are determined. It was shown that depending on the composition of the solutions the values of hydrodynamic diameter for aqueous solutions containing 1-5 wt.% PEG6000 and their mixtures with succinic and citric acids (~ 1 wt%) ranges from 3.6 to 5.2 nm. It is assumed that the formation of complexes with the sizes  that are within the above range is due to the features of interaction  and the structure of the complexes formed in solution.

Study of stabilization of self-assembly processes in fullerene C60 solution

2021 ◽  
Vol 23 (3) ◽  
pp. 12-14
Author(s):  
U.K. Makhmanov ◽  
A.M. Kokhkharov ◽  
Sh.A. Esanov ◽  
B.A. Aslonov ◽  
B.A. Sindarov ◽  
...  
Keyword(s):  
Refractive Index ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Molecular Interactions ◽  
Self Assembly ◽  
Fullerene C60 ◽  
Self Organization ◽  
Final Size ◽  
Initial Concentration ◽  
Xylene Solution

The dynamics of changes in the values of the refractive index of solutions of C60 in xylene at various concentrations has been studied by the refractometric method. It was found that the deviation from the linear form of the dependence of the refractive index on the C60 concentration occurs at a C60 concentration of 1.8 mg/ml. The deviation is associated with the largest number of molecular interactions between C60−C60 and the formation of large nanoclusters on their basis in solution. It was found by the dynamic light scattering (DLS) that the final size of C60 nanoclusters in solution depends on the initial concentration of the solute. A higher initial concentration of C60 leads to the synthesis of nanoclusters with a larger diameter. Using the method of optical spectroscopy, the processes of self-organization of fullerene C60 molecules in a xylene solution in time are studied. The character of stability of synthesized fullerene nanoclusters in solution is discussed. The results obtained are of particular importance for numerous applications of nanotechnology for understanding self-assembly processes and the development of new nanomaterials.

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