X-Ray diffraction data for (1→3)-α-d-glucan

Ogawa, K.; Misaki, Akira; Oka, Sachiko; Okamura, Keizo

doi:10.1016/s0008-6215(00)84664-9

Cited by 20 publications

(12 citation statements)

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“…12 ) Acetylation of the glucomannans was carried out with trifiuoroacetic anhydride. 14) In order to get a fiber diffraction pattern for Konjac glucomannan, its triacetate was cast as a continuous film from a chloroform solution. A strip of the film stretched to approximately 6· times its original length in hot glycerine (I 55°C) was deacetylated with 2 M sodium methoxide-methyl alcohol and then washed with methyl alcohol, while keeping the sample at a constant length.…”

Section: Methodsmentioning

confidence: 99%

X-Ray Diffraction Study of Glucomannans and Their Acetates

Ogawa¹,

Yui²,

Mizuno³

1991

Agricultural and Biological Chemistry

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Crystalline polymorphs of four glucomannans with a different mannose/glucose ratio from 1.5 to 4.0 and their acetyl derivatives was studied by X-ray diffraction measurements. The glucomannans showed an amorphous or similar crystal structure (Mannan I or Mannan II polymorph) of /?-l,4-D-mannan depending on their mannose content, indicating the occurrence of isomorphous replacement of mannose by glucose during glucomannan crystallization. Whenthese glucomannans were annealed, however, Konjac glucomannan (mannose/glucose ratio = 1.6) showed a different powder pattern from both MannansI and II. The fiber pattern of the annealed Konjac glucomannan indicated that it took an extended twofold helical structure. Amongthe acetylated glucomannans, Higanbana glucomannan with a high mannosecontent (mannose/glucose = 4.0) showed a similar diffraction pattern

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Section: Methodsmentioning

confidence: 99%

X-Ray Diffraction Study of Glucomannans and Their Acetates

Ogawa¹,

Yui²,

Mizuno³

1991

Agricultural and Biological Chemistry

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“…In vacuum, the stretched and annealed glucan film made from _S. salivarius (sample B) gave a clear x-ray pattern as shown in Figure 1 (17). All 29 reflections ( Figure 2) can be indexed with an orthorhombic unit cell (Tables I and II).…”

Section: Resultsmentioning

confidence: 99%

“…All 29 reflections ( Figure 2) can be indexed with an orthorhombic unit cell (Tables I and II). In the previous report (17), the unit cell was reported to be *Lattice parameters were obtained by a least-squares refinement program. monoclinic with a = 0.823 nm, b = 0.955 nm, c_ (fiber axis) = 0.844 nm, and y = 90°.…”

Section: Resultsmentioning

confidence: 99%

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Crystal Structure of (1→3)-α-D-Glucan

Ogawa

Okamura

Oka

et al. 1980

ACS Symposium Series

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“…By 1979, the structure of (1→3)-α- d -glucans had already been defined by Ogawa et al [45], who used X-ray analysis and defined conformation as extended, close to a 2/1 helix [45,46]. Moreover, in LiCl/DMSO solution, (1→3)-α- d -glucans occurs as a flexible chain [47,48] and (according to other reports) as a random coil [20] due to the breaking of hydrogen bonds.…”

Section: Structure and Property Of Fungal (1→3)-α-d-glucansmentioning

confidence: 99%

A Report on Fungal (1→3)-α-d-glucans: Properties, Functions and Application

et al. 2019

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The cell walls of fungi are composed of glycoproteins, chitin, and α- and β-glucans. Although there are many reports on β-glucans, α-glucan polysaccharides are not yet fully understood. This review characterizes the physicochemical properties and functions of (1→3)-α-d-glucans. Particular attention has been paid to practical application and the effect of glucans in various respects, taking into account unfavourable effects and potential use. The role of α-glucans in plant infection has been proven, and collected facts have confirmed the characteristics of Aspergillus fumigatus infection associated with the presence of glucan in fungal cell wall. Like β-glucans, there are now evidence that α-glucans can also stimulate the immune system. Moreover, α-d-glucans have the ability to induce mutanases and can thus decompose plaque.

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X-Ray diffraction data for (1→3)-α-d-glucan

Cited by 20 publications

References 10 publications

X-Ray Diffraction Study of Glucomannans and Their Acetates

X-Ray Diffraction Study of Glucomannans and Their Acetates

Crystal Structure of (1→3)-α-D-Glucan

A Report on Fungal (1→3)-α-d-glucans: Properties, Functions and Application

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