First obtaining of glass solutions and phase diagram of glucose with fully tunable anomeric concentration

Dujardin, N.; willart, Jean-François; Dudognon, Emeline; Danède, Florence; Descamps, Marc

doi:10.1002/jps.21900

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…21,22 It has been recently shown that the amorphization of glucose by milling leads to the formation of anomerically pure amorphous compounds. 23,24 We took advantage of this exceptional opportunity to study the mutarotation directly in the solid state. We report here direct experimental evidence of the mutarotation of glucose by means of Raman scattering measurements.…”

Section: Introductionmentioning

confidence: 99%

Solid State Mutarotation of Glucose

et al. 2011

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It has been recently shown that mechanical milling can amorphize D-glucose without any mutarotation, giving rise to an anomerically pure amorphous sample. We have taken advantage of this exceptional possibility to study the kinetic of mutarotation in the amorphous solid state. The investigations have been performed in situ by time-resolved Raman spectroscopy. The results reveal an unexpected coupling between the mutarotation process and the structural relaxations involved in the glassy state.

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Section: Introductionmentioning

confidence: 99%

Solid State Mutarotation of Glucose

et al. 2011

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“…To date, however, very few investigations have been performed in the dry state. It has been recently shown that the amorphization of glucose by milling leads to the formation of anomerically pure amorphous compounds [12,13]. This solid-state route to the amorphous state was found to be free of mutarotation, contrary to the usual quenching of the liquid which provides unavoidably a mixture of two monomers [14,15].…”

Section: Introductionmentioning

confidence: 99%

Surface Characterization of Powdered Cellulose Activated by Potassium Hydroxide in Dry Condition Through Ball Milling

Azadfar

Wolcott

2020

Polysaccharides

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The surface chemical compositions of powdered cellulose have been characterized utilizing X-ray photoelectron spectroscopy (XPS) and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) techniques. Powdered cellulose was prepared by milling of bleached softwood pulp residues through a lab-scale planetary ball mill. Here we show how milling a mixture of the powdered cellulose with potassium hydroxide determines the surface chemical compositions of the obtained powdered cellulose, in a completely dry condition. The XPS analysis indicated the presence of new carbon and oxygen atoms as C4, C5, and O3. In turn, the FTIR analysis showed the stretching vibrations of the carbon–carbon double bond. The results suggest the formation of active oxygenated species on powdered cellulose surfaces.

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“…After 150 years of studying mutarotation in solvents, only a few reports on mutarotation in the supercooled liquid and the glassy state have been reported until now. Very recently, studies on D-fructose, D-ribose, L-sorbose and (D,L)-fucose in the supercooled liquid state were carried out by Wlodarczyk et al 4-10 by means of dielectric spectroscopy, while D-glucose was studied intensively by Dujardin et al 11,12 in the supercooled liquid and the glassy state by means of Raman spectroscopy. All of these studies indicate that in the supercooled liquid state, the activation energy for this process can be higher or much lower than in the aqueous solution, but it is significantly lower than the theoretical predictions for the gas phase.…”

Section: Introductionmentioning

confidence: 99%

A mutarotation mechanism based on dual proton exchange in the amorphous d-glucose

Włodarczyk

Paluch

Włodarczyk

et al. 2014

Phys. Chem. Chem. Phys.

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It is a well known fact that carbohydrates have unusual chemical and physical properties when they approach the glassy state during the cooling process. Differences between sugar aqueous solutions and their pure anhydrous states are caused mainly by the different intermolecular interactions related to the different hydrogen bond patterns. The mutarotation, a specific reaction in the saccharides, was recently investigated in the supercooled liquid and the glassy state of D-glucose. It was shown that the activation energy of this process in the supercooled liquid state is twice as low as for the same process in aqueous solution. In contrast, the activation energy in the glassy state is twice as high as in the aqueous solution. Herein, we present possible explanations for this phenomenon and propose a universal mechanism for the mutarotation process in the amorphous state of matter. In this work, for the first time, a double proton exchange mechanism in carbohydrates is proposed.

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First obtaining of glass solutions and phase diagram of glucose with fully tunable anomeric concentration

Cited by 5 publications

References 23 publications

Solid State Mutarotation of Glucose

Solid State Mutarotation of Glucose

Surface Characterization of Powdered Cellulose Activated by Potassium Hydroxide in Dry Condition Through Ball Milling

A mutarotation mechanism based on dual proton exchange in the amorphous d-glucose

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