Characterization of the secondary structure and order–disorder transition of a β-(1 → 3, 1 → 6)-glucan from Aureobasidium pullulans

Kono, Hiroyuki; Kondo, Nobuhiro; Isono, Takuya; Ogata, Makoto; Hirabayashi, Katsuki

doi:10.1016/j.ijbiomac.2019.11.018

Cited by 16 publications

(7 citation statements)

References 41 publications

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“…Solid Relaxation Measurements. The solid T 1C and T 1ρH measurements were performed according to the methods reported previously 19,20 via the solid-state NMR experiments described above. Briefly, the T 1C measurements were performed by the Torchia method 21 by varying the 13 C relaxation delays of 0.1, 0.5, 1.0, 2.5, 5, 7.5, 10, 30, and 60 s. The integral value of each 13 C resonance region was plotted against the 13 C relaxation delay, and the plots were fitted with a monoexponential function (eq 1).…”

Section: ■ Introductionmentioning

confidence: 99%

Nanofibrillated Bacterial Cellulose Surface Modified with Methyltrimethoxysilane for Fiber-Reinforced Composites

Kono

Uno

Tsujisaki

et al. 2020

ACS Appl. Nano Mater.

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Surface modification of nanofibrillated bacterial cellulose (NFBC) with methyltrimethoxysilane was performed in water to hydrophobize its surface. A series of cellulose samples with different degrees of molar substitution of methyltrimethoxysilane was prepared by changing the NFBC:methyltrimethoxysilane ratio in the preparation. Detailed structural characterization of these samples, including their degrees of molar substitution and crystallinity, was conducted by X-ray diffraction, Fourier-transform infrared spectroscopy, and solid-state NMR spectroscopy, and their molecular dynamics were studied by solid NMR relaxation measurements. Furthermore, the effects of degrees of molar substitution on their dispersibility in organic solvents and fiber morphology were evaluated. These analyses revealed that the solidstate relaxation behaviors of the cellulose and polysiloxane domains formed on the NFBC surface strongly correlate with their dispersibility in chloroform. The optimal degree of molar substitution for NFBC was found to be 0.66. The surface-modified NFBC with the degree of molar substitution of 0.66 showed the almost equivalent molecular mobility as NFBC and could be uniformly dispersed in chloroform. Therefore, it was revealed that the solid-state NMR could provide extremely valuable information on the mobility and surface chemical property of the surface-modified NFBC. In addition, the surface-modified NFBC could be an excellent filler for fiber-reinforced nanocomposite resins.

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Section: ■ Introductionmentioning

confidence: 99%

Nanofibrillated Bacterial Cellulose Surface Modified with Methyltrimethoxysilane for Fiber-Reinforced Composites

Kono

Uno

Tsujisaki

et al. 2020

ACS Appl. Nano Mater.

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“…Conformation analysis can be performed using X-ray diffraction (XRD), e.g., for measuring the triple-helix β -glucan [ 71 ]. Atomic force microscopy (AFM) is a powerful tool to observe chain conformations in solution, including rod-, sphere- and fiber-like shapes.…”

Section: Characterization Methods For β -Glucan Structure and Conformation Analysismentioning

confidence: 99%

A Review on the Structure and Anti-Diabetic (Type 2) Functions of β-Glucans

Wan

Gilbert

et al. 2021

Foods

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Type 2 diabetes, a long-term chronic metabolic disease, causes severe and increasing economic and health problems globally. There is growing evidence that β-glucans can function as bioactive macromolecules that help control type 2 diabetes with minimal side effects. However, conflicting conclusions about the antidiabetic activities of β-glucans have been published, potentially resulting from incomplete understanding of their precise structural characteristics. This review aims to increase clarity on the structure–function relationships of β-glucans in treating type 2 diabetes by examining detailed structural and conformational features of naturally derived β-glucans, as well as both chemical and instrumental methods used in their characterization, and their underlying anti-diabetic mechanisms. This may help to uncover additional structure and function relationships and to expand applications of β-glucans.

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“…Triple helical and single random coil structures of APG were prepared by dissolving 250 mg of APG in 50 mL of deionized water and DMSO, respectively, at 298 K for 3 d followed by lyophilization. In a method similar to that used to prepare the triple helical and single random coil structures of APG, lyophilization of SPG dissolved in water or DMSO for 3 d provided the triple helical and single random coil structures of SPG, respectively [1].…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

“…id="M1" xmlns:mml="http://www.w3.org/1998/Math/MathML">It=I0exptrue(−t/T1ρHtrue)where I t is the measured integral value at 1 H spin-lock time t and I 0 is the initial intensity ( t = 0) of the 13 C magnetization. The T 1ρH values for the four 13 C region of each sample could be determined by the fitting curves [1].…”

Section: Datamentioning

confidence: 99%

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Solid-state relaxation NMR dataset for a water-soluble β-(1→3, 1→6)-glucan from Aureobasidium pullulans and schizophyllan from Schizophyllum commune

et al. 2020

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We report the solid-state nuclear magnetic resonance (NMR) relaxation dataset for a triple helix and a random structure of water-soluble Aureobasidium pullulans β-(1→3, 1→6)-d-glucan (APG) and those of schizophyllan from Schizophyllum commune (SPG), obtained by the Bruker BioSpin 500 MHz NMR spectrometer. These data include solid-state proton spin-lattice relaxation in the rotating frame (T1ρH) and 13C spin-lattice relaxation (T1C) of these two β-(1→3, 1→6)-glucans, which are related to the subject of article in International Journal of Biological Macromolecules, entitled “Characterization of the secondary structure and order–disorder transition of a β-(1→3, 1→6)-glucan from Aureobasidium pullulans” [1]. Data can help to investigate the structural characterization of the structural polysaccharides.

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Characterization of the secondary structure and order–disorder transition of a β-(1 → 3, 1 → 6)-glucan from Aureobasidium pullulans

Cited by 16 publications

References 41 publications

Nanofibrillated Bacterial Cellulose Surface Modified with Methyltrimethoxysilane for Fiber-Reinforced Composites

Nanofibrillated Bacterial Cellulose Surface Modified with Methyltrimethoxysilane for Fiber-Reinforced Composites

A Review on the Structure and Anti-Diabetic (Type 2) Functions of β-Glucans

Solid-state relaxation NMR dataset for a water-soluble β-(1→3, 1→6)-glucan from Aureobasidium pullulans and schizophyllan from Schizophyllum commune

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