Anzeichen für eine Kettenfaltung des Cellulosemoleküls

Dolmetsch, H.

doi:10.1007/bf01542345

Cited by 13 publications

(2 citation statements)

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“…It was inevitable that these findings were also applied to cellulose. Chain folding within the microfibrils was proposed by Tbnnesen and Ellefsen (44), Dolmetsch and Dolmetsch (9). Manley (21), Marx-Figini and Schulz (24).…”

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confidence: 92%

Fine structure of natural polysaccharide systems

Mühlethaler

1969

J. polym. sci., C Polym. symp.

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The ultrastructure of cellulose in higher plant cell walls is discussed. The primary and secondary wall is built up of a framework of microfibrils composed of smaller strands which are termed elementary fibrils. In recent years a number of models for the chain‐arrangement of the cellulose molecules have been proposed. According to one view the cellulose chains are in a folded conformation. Based on a new method which allows the determination of the chain‐arrangement in the elementary fibrils it was found that the structural carbohydrate must be aggregated into continuous, extended‐chain filaments of nearly perfect crystallinity. Freezeeten profiles suggest that the mechanism of fibrillar formation is characterized by enzyme particles attached to the plasma membrane and involved in cellulose synthesis.

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confidence: 92%

Fine structure of natural polysaccharide systems

Mühlethaler

1969

J. polym. sci., C Polym. symp.

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“…Bei Algen-Cellulose konnte Schnepf (1965) keine einheitliche Fibrillenbreite feststellen, und auch Lazaro (Lazaro 1973;Lazaro und Chiaverina 1973) bezweifelt die Existenz von Elementarfibrillen gleichen Durchmessers bei Valonia-Cellulose. Seit den verschiedenen Vorschlägen von Kettenfaltungsmodellen (T0nnesen und Ellefsen 1960;Dolmetsch 1961;Manley 1964;Marx-Figini und Schulz 1966) ist eine heftige Diskussion entbrannt, ob in nativem Zustand die Cellulosemoleküle gefaltet sind oder nicht. Er schloß daraus, daß die meßbare Fibrillenbreite von der Art der Delignifizierung abhängt, und daß keine übergeordneten Strukturen in der Holzzellwand vorliegen.…”

Section: Introductionunclassified

Über die fibrilläre Struktur von Cellulose aus Holz

Fengel¹

1978

Holzforschung

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The structure of native cellulose

1974

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SynopsisNative cellulose has been shown to consist of a crystalline array of parallel chains, based on the X-ray diffraction data for specimens from the sea alga Vaknia ventricosadThe unit cell is monoclinic with dimensions a = 16.34 d, b = 15.72 A, c = 10.38 A (fiber axis), and @ = 97.0'. The space group is P21 and the cell contains disaccharide segments of eight chains. hlodels containing chains with the same sense (parallel) or alternating sense (antiparallel) were refined against the intensity data using rigidbody least squares procedures. The results show a preference for a parallel chain structure with specific chain polarity with respect to the c axis. The refinement places the -CHtOH side chains approximately 20" from the so-called tg conformation, with a result that an 02'-H. . .06 intramolecular bond is formed. The structure also contains an 03-H . . .05' intramolecular bond and an 06-H . . .03 intermolecular bond along the a axis. All these bonds lie in the 020 planes, and the structure is an array of hydrogenbonded sheets. A major consequence of this work is that regular chain folding can be ruled out and cellulose is seen as extended chain polymer single crystals.

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Anzeichen für eine Kettenfaltung des Cellulosemoleküls

Cited by 13 publications

References 12 publications

Fine structure of natural polysaccharide systems

Fine structure of natural polysaccharide systems

Über die fibrilläre Struktur von Cellulose aus Holz

The structure of native cellulose

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