High Resolution Q-Space Imaging Studies of Water in Elastin

Boutis, Gregory S.; Renner, Christopher; Isahkarov, Tamara; Islam, Tasneem; Kannangara, Lahiru; Kaur, Pavitarjit; Mananga, Eugene Stephane; Ntekim, Atim; Rumala, Yisa; Wei, Doug

doi:10.1063/1.3058547

Cited by 3 publications

(6 citation statements)

References 15 publications

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“…Nevertheless, the presently observed dynamics should also not be confused with that of a typical JG β-relaxation because the motional process involves both a quasi-isotropic reorientation and a translational diffusion of the water molecules. The latter, distinguishing feature was directly demonstrated via NMR diffusometry for the rigid-matrix phases of hydrated elastin and hydrated collagen [54,55]. We point out that the phenomenology for this kind of secondary, but delocalized ν-process is by no means restricted to binary aqueous glasses.…”

Section: Discussionmentioning

confidence: 72%

“…Previously, 1 H PFG NMR was used to investigate translational motions of various protein hydration waters [52,53], including hydrated collagen [54] and hydrated elastin [55].…”

Section: Comparison Of Ds and Nmr Data For Dynamics Of Hydration Watementioning

confidence: 99%

“…These values are about an order of magnitude smaller than the corresponding diffusivity of bulk water and provide clear evidence for the existence of a translational motion of protein hydration waters on a micrometer length scale. In particular, for hydrated elastin and collagen, the results of the PFG NMR studies [54,55] demonstrate that long-range water transport occurs in basically rigid protein environments and, hence, that the water dynamics is non-local.…”

Section: Comparison Of Ds and Nmr Data For Dynamics Of Hydration Watementioning

confidence: 99%

“…This feature would be hard to reconcile with the fact that typical JG β-relaxations are associated with anisotropic motions. Secondly, hydration water can perform a translational displacement on the micrometer length scale deep in the glassy phase [54,55], whereas conventional βprocesses are understood to involve only spatially localized molecular motions.…”

Section: Decoupled Water Motionmentioning

confidence: 99%

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NMR and dielectric studies of hydrated collagen and elastin: Evidence for a delocalized secondary relaxation

Lusceac

Rosenstihl

Vogel

et al. 2011

Journal of Non-Crystalline Solids

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Using a combination of dielectric spectroscopy and solid-state deuteron NMR, the hydration water dynamics of connective tissue proteins is studied at sub-ambient temperatures. In this range, the water dynamics follows an Arrhenius law. A scaling analysis of dielectric losses, 'two-phase' NMR spectra, and spin-lattice relaxation times consistently yield evidence for a Gaussian distribution of energy barriers. With the dielectric data as input, random-walk simulations of a large-angle, water reorientation provide an approximate description of stimulated-echo data on hydrated elastin. This secondary process is quasi-isotropic and delocalized. The delocalization is inferred from previous NMR diffusometry experiments. It is emphasized that the phenomenology of this process is shared by many non-aqueous binary glasses in which the constituent components exhibit a sufficient dynamical contrast.

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Section: Discussionmentioning

confidence: 72%

“…Previously, 1 H PFG NMR was used to investigate translational motions of various protein hydration waters [52,53], including hydrated collagen [54] and hydrated elastin [55].…”

Section: Comparison Of Ds and Nmr Data For Dynamics Of Hydration Watementioning

confidence: 99%

Section: Comparison Of Ds and Nmr Data For Dynamics Of Hydration Watementioning

confidence: 99%

Section: Decoupled Water Motionmentioning

confidence: 99%

See 2 more Smart Citations

NMR and dielectric studies of hydrated collagen and elastin: Evidence for a delocalized secondary relaxation

Lusceac

Rosenstihl

Vogel

et al. 2011

Journal of Non-Crystalline Solids

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show abstract

“…The timescale of our DQF experiments range from τ = 0.1 ms up to 30 ms. The time dependent diffusion coefficients of water in elastin have been previously published by our group and are approximately D = 0.9 × 10 −6 (5 °C) to 2.3 × 10 −6 (37 °C) cm 2 /s over a time scale of 30 ms [34], The root mean square of the spatial displacement is given by…”

Section: Resultsmentioning

confidence: 99%

Investigation of the dynamical properties of water in elastin by deuterium Double Quantum Filtered NMR

Sun¹,

Boutis²

2010

Journal of Magnetic Resonance

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The anisotropic motion of tightly bound waters of hydration in bovine nuchal ligament elastin has been studied by deuterium Double Quantum Filtered (DQF) NMR. The experiments have allowed for a direct measurement of the degree of anisotropy within pores of elastin over a time scale ranging from 100 μs to 30 ms, corresponding to a tortuous spatial displacement ranging from 0.2 to 7 μm. We studied the anisotropic motion of deuterium nuclei in D2O hydrated elastin over a temperature of −15 °C to 37 °C and in solvents with varying dielectric constants. Our experimental measurements of the residual quadrupolar interaction as a function of temperature are correlated to the existing notion of hydrophobic collapse near 20 °C.

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Methane Storage in Nanoporous Media as Observed via High-Field NMR Relaxometry

Papaioannou

Kausik

2015

Phys. Rev. Applied

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The storage properties of methane gas in Vycor porous glass (5.7 nm) are characterized in a wide pressure range from 0.7 MPa-89.7 MPa using Nuclear Magnetic Resonance (NMR). We demonstrate the capability of high field NMR relaxometry for the determination of the methane gas storage capacity and the measurement of the Hydrogen Index, to a high degree of accuracy. This helps determine the excess gas in the pore space which can be identified to exhibit Langmuir properties in the low pressure regime of 0.7 MPa to 39.6 Mpa. The Langmuir model enables us to determine the equilibrium density of the monolayer of adsorbed gas to be 8.5% lower than that of liquid methane. We also identify the signatures of multilayer adsorption at the high pressure regime from 39.6 Mpa to 89.7 Mpa and use the Brunauer-Emmet-Teller (BET) theory to determine the number of adsorbed layers of methane gas. We show how these measurements help us differentiate the gas stored in the Vycor pore space into free and adsorbed fractions for the entire pressure range paving way for similar applications such as studying natural gas storage in gas shale rock or hydrogen storage in carbon nanotubes. arXiv:1507.06861v2 [physics.geo-ph] 3 Sep 2015

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High Resolution Q-Space Imaging Studies of Water in Elastin

Cited by 3 publications

References 15 publications

NMR and dielectric studies of hydrated collagen and elastin: Evidence for a delocalized secondary relaxation

NMR and dielectric studies of hydrated collagen and elastin: Evidence for a delocalized secondary relaxation

Investigation of the dynamical properties of water in elastin by deuterium Double Quantum Filtered NMR

Methane Storage in Nanoporous Media as Observed via High-Field NMR Relaxometry

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