Selective acetolysis of cellulose to low degrees of polymerization

Kaustinen, Hilkka M.; Kaustinen, Ola A.; Swenson, Harold A.

doi:10.1016/s0008-6215(00)80084-1

Cited by 10 publications

(4 citation statements)

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“…The grainy, yellowish cellulose triacetate is subsequently washed first with water and then with methanol to remove smaller (water-soluble) saccharides and the yellow color. The yield with regard to the amount of cellulose powder employed was as high as 90% (w/w) [92].…”

Section: Acetolysismentioning

confidence: 99%

“…In order to address the preparation of cellooligosaccharides with higher degrees of polymerization, Kaustinen et al [92] presented a method for selective acetolysis of cellulose to DPs ranging from 18 to 100. The study was inspired by a method originally developed by Frith [93] in an effort to determine the kinetics of the acidcatalyzed acetylation of cellulose.…”

Section: Acetolysismentioning

confidence: 99%

“…The amount of cellulose used should be around 3% (w/w). Through variation of the reaction parameters (i.e., type and concentration of catalyst, temperature, and time), different product compounds with regard to the average DP of the peracetylated polysaccharides can be achieved, ranging from DP 18, when hypochloric acid at the highest concentration is used, to DP 100, when sulfuric acid at the lowest concentration is used [92]. The products are isolated by increasing the pH with sodium acetate, which precipitates the oligosaccharides.…”

Section: Acetolysismentioning

confidence: 99%

“…Kaustinen et al [92], who developed the method of selective acetolysis, allowing the preparation of cellooligosaccharides with a defined DP of 18-100 by altering the reaction conditions, used SEC on a silica-based material to determine the molecular weight of their product hydrolysates. Elution was performed with 1:1 (v/v) 1,4-dioxane and 1,2-dichloroethane.…”

Section: Size Exclusion Chromatographymentioning

confidence: 99%

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Preparation and Analysis of Cello- and Xylooligosaccharides

Vejdovszky

Oberlerchner

Zweckmair

et al. 2015

Advances in Polymer Science

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This review provides a general overview of preparation, separation, and analytical methods for cello-and xylooligosaccharides. Arising as side-stream products of different biorefinery processes, these compounds have increasingly gained the interest of researchers and engineers in the last few decades. Beside their application as additives in the food, feed, and pharmaceutical industries, these oligomeric carbohydrates are of key importance as model compounds for studying the dependence of physicochemical properties on the degree of polymerization (DP). First, different preparation methods for mixtures of oligosaccharides with DPs between 1 and 30 are discussed. These methods include acetolysis, acid and enzymatic hydrolysis, and glycoside synthesis. Then, separation techniques, including size exclusion chromatography, normal phase and hydrophilic interaction chromatography, and chromatography on cation exchange resins, are presented. Analysis of oligosaccharides by different techniques is described.

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Section: Acetolysismentioning

confidence: 99%

Section: Acetolysismentioning

confidence: 99%

Section: Acetolysismentioning

confidence: 99%

Section: Size Exclusion Chromatographymentioning

confidence: 99%

See 2 more Smart Citations

Preparation and Analysis of Cello- and Xylooligosaccharides

Vejdovszky

Oberlerchner

Zweckmair

et al. 2015

Advances in Polymer Science

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Single crystals and oriented crystallization of ivory nut mannan

et al. 1979

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SynopsisThe preparation of lamellar single crystals of mannan[poly((l -4)-P-D-mannose)] is described. Electron diffractograms clearly identify the perpendicular orientation of the chain axis with respect to the lamellar surface. Since the degree of polymerization is 40 or less, no conclusion is made as to chain folding. The unit cell corresponds to the mannan I structure derived from x-ray fiber data on oriented algal mannan. The baseplane dimensions found were a = 7.22 8 and b = 8.92 8, and the systematic absences observed confirm the proposed P212121 group. It was found that cellulose microfibrils from Valonia uentricosa and bacterial cellulose could serve as extended chain nuclei for inducing oriented crystallization of mannan on cellulose. This produces a shish-kebab type of morphology.

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Single crystals of cellulose II

Buléon

Chanzy

1978

J. Polym. Sci. Polym. Phys. Ed.

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SynopsisRibbon-like lamellar single crystals of cellulose I1 are grown from dilute aqueous solution of cellulose triacetate (number-average degree of polymerization (DP)-15) by deacetylation and consequent precipitation. The best results are obtained with methylamine as the deacetylation reagent a t 90°C. Electron diffraction indicates the (170) planes to be the growth face. Twin growth occurs frequently with (170) as the twinning plane.

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Selective acetolysis of cellulose to low degrees of polymerization

Cited by 10 publications

References 0 publications

Preparation and Analysis of Cello- and Xylooligosaccharides

Preparation and Analysis of Cello- and Xylooligosaccharides

Single crystals and oriented crystallization of ivory nut mannan

Single crystals of cellulose II

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