Precipitation and crystallization of cellulose doped with dyes

Quenin, I.; Henrissat, Bernard

doi:10.1002/marc.1985.030061106

Cited by 8 publications

(2 citation statements)

References 14 publications

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“…Cellulose precipitated from N-methylmorpholine N-oxide solution in the presence of Congo red has been found to be completely amorphous and crystallizes only after the removal of the dye by treatment in hot water. 31 Immersion in water at llO°C for 24 h marginally increases the crystallinity of cellulose samples regenerated from LiCl/DMAC solutions. Congo red is removed by this treatment as indicated by the decrease in intensity of the dye absorption band shown in Fig.…”

Section: X-ray Diffractionmentioning

confidence: 96%

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Cholesteric order in gels and films of regenerated cellulose

Ritcey

Gray

1988

Biopolymers

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SynopsisCongo red bound to regenerated cellulose in highly swollen gel films formed by slow precipitation from LiCl/N,N-dimethylacetamide solution exhibits induced optical activity. The induced CD band of the dye vanishes when these films are dried under uniaxial stress, indicating that the effect is structural in origin and not simply due to association of dye with chiral centers on the cellulose chain. Cellulose was also regenerated from cellulose acetate films, cast both from isotropic and cholesteric solution, by deacetylation in aqueous ammonia. Congo red bound to cellulose regenerated from cholesteric cellulose acetate exhibits an induced CD band similar to that obtained for films precipitated from LiCl/DMAC solution. The CD spectrum of Congo red in cellulose films regenerated from isotropic cellulose acetate is featureless. These observations indicate that cellulose adopts cholesteric order on slow precipitation from solution.

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Section: X-ray Diffractionmentioning

confidence: 96%

“…31 Immersion in water at llO°C for 24 h marginally increases the crystallinity of cellulose samples regenerated from LiCl/DMAC solutions. Congo red is removed by this treatment as indicated by the decrease in intensity of the dye absorption band shown in Fig.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Cholesteric order in gels and films of regenerated cellulose

Ritcey

Gray

1988

Biopolymers

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Ultraviolet Absorption Spectroscopy

Esfandiary¹,

Middaugh²

2012

Analysis of Aggregates and Particles in Protein Pharmaceuticals

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Docking of congo red to the surface of crystalline cellulose using molecular mechanics

1995

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A method for the docking of ligands to crystalline surfaces using molecular mechanics was developed and applied to study the molecular features of the adsorption of Congo Red to cellulose crystals. The docking procedure was based on a grid search exploring the surface repeat unit of the cellulose crystals using several orientations of Congo Red at each grid point. Results suggest a preferential adsorption of Congo Red onto certain faces of the cellulose crystals and that the lower energy conformers have a similar positioning and orientation with respect to the cellulose chains at the surface repeat unit.

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Precipitation and crystallization of cellulose doped with dyes

Cited by 8 publications

References 14 publications

Cholesteric order in gels and films of regenerated cellulose

Cholesteric order in gels and films of regenerated cellulose

Ultraviolet Absorption Spectroscopy

Docking of congo red to the surface of crystalline cellulose using molecular mechanics

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