Sound velocity and hydration phenomena in aqueous polymeric solutions

Maisano, G.; Majolino, D.; Migliardo, P.; Venuto, S.; Aliotta, F.; Magazù, Salvatore

doi:10.1080/00268979300100311

Cited by 54 publications

(63 citation statements)

References 13 publications

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“…This is not surprising since PEG is known to have a large exclusion volume and steric hindrance due to the high hydration layer around PEG chains. 48,49 The second transition at low molecular area, however, is only decreased by ~10–20 Å 2 /molecule for the PEGylated amphiphile compared to the non-PEGylated amphiphile at the same surface pressure. This is indicative that upon interhelix contact, the presence of PEG does not significantly affect the horizontal to perpendicular transition of the amphiphiles.…”

Section: Resultsmentioning

confidence: 99%

Understanding Peptide Oligomeric State in Langmuir Monolayers of Amphiphilic 3-Helix Bundle-Forming Peptide-PEG Conjugates

Lund

Ang²,

Shu³

et al. 2016

Biomacromolecules

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Coiled-coil peptide–polymer conjugates are an emerging class of biomaterials. Fundamental understanding of the coiled-coil oligomeric state and assembly process of these hybrid building blocks is necessary to exert control over their assembly into well-defined structures. Here, we studied the effect of peptide structure and PEGylation on the self-assembly process and oligomeric state of a Langmuir monolayer of amphiphilic coiled-coil peptide–polymer conjugates using X-ray reflectivity (XR) and grazing-incidence X-ray diffraction (GIXD). Our results show that the oligomeric state of PEGylated amphiphiles based on 3-helix bundle-forming peptide is surface pressure dependent, a mixture of dimers and trimers was formed at intermediate surface pressure but transitions into trimers completely upon increasing surface pressure. Moreover, the interhelical distance within the coiled-coil bundle of 3-helix peptide-PEG conjugate amphiphiles was not perturbed under high surface pressure. Present studies provide valuable insights into the self-assembly process of hybrid peptide–polymer conjugates and guidance to develop biomaterials with controlled multivalency of ligand presentation.

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Section: Resultsmentioning

confidence: 99%

Understanding Peptide Oligomeric State in Langmuir Monolayers of Amphiphilic 3-Helix Bundle-Forming Peptide-PEG Conjugates

Lund

Ang²,

Shu³

et al. 2016

Biomacromolecules

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“…PEG is infinitely soluble in water [7] and each monomer of PEG needs from 2 to 3 molecules of water to complete hydration [8]. In this way, the hydration reaction leads to PEGh concentration of 0.69 g/cm 3 .…”

Section: Mathematical Modelmentioning

confidence: 99%

A model for PEG removal from alumina injection moulded parts by solvent debinding

Krauss

Oliveira

Klein

et al. 2007

Journal of Materials Processing Technology

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“…More specifically, a negative ͑positive͒ excess compressibility 1,2,[4][5][6][7][8][9][10][11][12][13][14] in binary mixtures is related to attractive ͑repulsive͒ interactions between unlike species which gives rise to a more ͑less͒ rigid local structure. Moreover, more complicated behaviors can be ascribed to the ability of one or both components to develop dynamical networks, whose properties explicitly depend on concentration.…”

Section: Introductionmentioning

confidence: 99%

Excess compressibility in binary liquid mixtures

Aliotta

Gapiński

Pochylski

et al. 2007

The Journal of Chemical Physics

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Brillouin scattering experiments have been carried out on some mixtures of molecular liquids. From the measurement of the hypersonic velocities we have evaluated the adiabatic compressibility as a function of the volume fraction. We show how the quadratic form of the excess compressibility dependence on the solute volume fraction can be derived by simple statistical effects and does not imply any interaction among the components of the system other than excluded volume effects. This idea is supported by the comparison of the experimental results with a well-established prototype model, consisting of a binary mixture of hard spheres with a nonadditive interaction potential. This naive model turns out to be able to produce a very wide spectrum of structural and thermodynamic features depending on values of its parameters. An attempt has made to understand what kind of structural information can be gained through the analysis of the volume fraction dependence of the compressibility.

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Sound velocity and hydration phenomena in aqueous polymeric solutions

Cited by 54 publications

References 13 publications

Understanding Peptide Oligomeric State in Langmuir Monolayers of Amphiphilic 3-Helix Bundle-Forming Peptide-PEG Conjugates

Understanding Peptide Oligomeric State in Langmuir Monolayers of Amphiphilic 3-Helix Bundle-Forming Peptide-PEG Conjugates

A model for PEG removal from alumina injection moulded parts by solvent debinding

Excess compressibility in binary liquid mixtures

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