PolySacDb

A Database of Polysachharide 3D structures

 
By A. Sarkar & S. Pérez
 
 
 

Polysaccharides For Experts

Inulin (Hemihydrate)

 

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Diffraction Diagram

 

Fig.1 Comparison of the observed (A) and simulated (B) electron diffraction patterns for the base plane (hk0) of inulin hemihydrate. The arrow points toward the 040 reflection that is weak in the observed diffractogram but absent in the simulated pattern.

 

Fig.2 Comparison of the simulated (A and C) and observed (B and D) X-ray patterns of inulin hemihydrate. A and B correspond to powder patterns whereas C and D correspond to oriented patterns taken on crystal mats with the X-ray beam parallel to the mat surface. The arrows in B and D correspond to composite reflections 110 and 200 that are observed in inulin hemihydrate but are totally absent in inulin monohydrate.

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  Inulin (Hemihydrate)

Linkage :       beta 2-1      alpha 1-2

 

Space Group :       orthorhombic P212121

 

Unit Cell Dimensions (a, b, c in Å and α, β, γ in °)

(No values are displayed if no information is available or the value is zero)

a (Å) =   16.70

b (Å) =   9.65

c (Å) =   14.40

 

γ (°) =   90.00

 

Helix Type :      

two antiparallel sixfold helices centred on the twofold screw axes intersecting the base plane of the orthorhombic system

 

Method(s) Used For Structure Determination :      

electron diffraction patterns for the base plane (hk0) hemihydrate

 

Link to the Abstract :      
 
http://pubs.acs.org/doi/abs/10.1021/ma951799f

 

Reference :      

Molecular and Crystal Structures of Inulin from Electron Diffraction Data
I. André, K. Mazeau, I. Tvaroska, J.-L. Putaux, W. T. Winter, F. R. Taravel, and, H. Chanzy, Macromolecules 1996, 29(13), 4626-4635

 

 

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