Molecular vibration and Boson peak analysis of glucose polymers and ester via terahertz spectroscopy

Zhong, Junlan; Mori, Tatsuya; Fujii, Yasuhiro; Kashiwagi, Takanari; Terao, Wakana; Yamashiro, Midori; Minami, Hidotoshi; Tsujimoto, Manabu; Tanaka, Tomoaki; Kawashima, Hidehisa; Itô, Junko; Kijima, Masashi; Iji, Masatoshi; Watanabe, Makoto M.; Kadowaki, K.

doi:10.1016/j.carbpol.2019.115789

Cited by 14 publications

(4 citation statements)

References 48 publications

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“…A terahertz time-domain spectroscopy (THz-TDS) system (RT-10000, Tochigi Nikon Co.) and a liquid-helium flow cryostat system (Helitran LT-3B, Advanced Research Systems) [28,30,54,55] were used with the standard transmission configuration for temperature-dependent measurements in the frequency range of 0.25-2.25 THz from 13 to 295 K. Lowtemperature grown GaAs photoconductive antennae were used as emitters and detectors of the THz wave. The THz wave propagation path was enclosed in a dry air chamber within which dry air flowed.…”

Section: B Terahertz Time-domain Spectroscopymentioning

confidence: 99%

Detection of boson peak and fractal dynamics of disordered systems using terahertz spectroscopy

et al. 2020

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The boson peak is a largely unexplained excitation found universally in the terahertz vibrational spectra of disordered systems; the so-called fracton is a vibrational excitation associated with the self-similar structure of monomers in polymeric glasses. We demonstrate that such excitations can be detected using terahertz spectroscopy. In the case of fractal structures, we determine the infrared light-vibration coupling coefficient for the fracton region and show that information concerning the fractal and fracton dimensions appears in the exponent of the absorption coefficient. Finally, using terahertz time-domain spectroscopy and low-frequency Raman scattering, we experimentally observe these universal excitations in a protein (lysozyme) system that has an intrinsically disordered and fractal structure and argue that the system should be considered a single supramolecule. These findings are applicable to amorphous and fractal objects in general and will be valuable for understanding universal dynamics of disordered systems via terahertz light.

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Section: B Terahertz Time-domain Spectroscopymentioning

confidence: 99%

Detection of boson peak and fractal dynamics of disordered systems using terahertz spectroscopy

et al. 2020

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“…Of course, it is too early to talk about a full understanding of the relationship between the structure of these two substances, and extra studies are required, involving, for example, molecular modeling methods. However, it is already clear that the feasibility of THz-TDS as a structural method is not restricted to crystalline objects [ 67 , 88 , 89 , 90 , 91 ], but it could be developed to a consistent method of studying aqueous solution structures such as NMR and IR-spectroscopy. In addition, instead of the chemical shift and the position of spectral bands, THz spectroscopy should operate by the dielectric permittivity parameters of the water phase of the studied solutions.…”

Section: Discussionmentioning

confidence: 99%

Relationships between Molecular Structure of Carbohydrates and Their Dynamic Hydration Shells Revealed by Terahertz Time-Domain Spectroscopy

Penkov

2021

IJMS

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Despite more than a century of research on the hydration of biomolecules, the hydration of carbohydrates is insufficiently studied. An approach to studying dynamic hydration shells of carbohydrates in aqueous solutions based on terahertz time-domain spectroscopy assay is developed in the current work. Monosaccharides (glucose, galactose, galacturonic acid) and polysaccharides (dextran, amylopectin, polygalacturonic acid) solutions were studied. The contribution of the dissolved carbohydrates was subtracted from the measured dielectric permittivities of aqueous solutions based on the corresponding effective medium models. The obtained dielectric permittivities of the water phase were used to calculate the parameters describing intermolecular relaxation and oscillatory processes in water. It is established that all of the analyzed carbohydrates lead to the increase of the binding degree of water. Hydration shells of monosaccharides are characterized by elevated numbers of hydrogen bonds and their mean energies compared to undisturbed water, as well as by elevated numbers and the lifetime of free water molecules. The axial orientation of the OH(4) group of sugar facilitates a wider distribution of hydrogen bond energies in hydration shells compared to equatorial orientation. The presence of the carboxylic group affects water structure significantly. The hydration of polysaccharides is less apparent than that of monosaccharides, and it depends on the type of glycosidic bonds.

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“…Of course, it is too early to talk about a full understanding of the relationship between the structure of these two substances, and extra studies are required, involving, for example, molecular modeling methods. However, it is already clear that the feasibility of THz-TDS as a structural method is not restricted to crystalline objects [67,[88][89][90][91], but it www.videleaf.com could be developed to a consistent method of studying aqueous solution structures such as NMR and IR-spectroscopy. In addition, instead of the chemical shift and the position of spectral bands, THz spectroscopy should operate by the dielectric permittivity parameters of the water phase of the studied solutions.…”

Section: Carbohydratementioning

confidence: 99%

Relationships between Molecular Structure of Carbohydrates and Their Dynamic Hydration Shells Revealed by Terahertz Time-Domain Spectroscopy

Penkov

2022

Prime Archives in Molecular Sciences

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Molecular vibration and Boson peak analysis of glucose polymers and ester via terahertz spectroscopy

Cited by 14 publications

References 48 publications

Detection of boson peak and fractal dynamics of disordered systems using terahertz spectroscopy

Detection of boson peak and fractal dynamics of disordered systems using terahertz spectroscopy

Relationships between Molecular Structure of Carbohydrates and Their Dynamic Hydration Shells Revealed by Terahertz Time-Domain Spectroscopy

Relationships between Molecular Structure of Carbohydrates and Their Dynamic Hydration Shells Revealed by Terahertz Time-Domain Spectroscopy

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