The crystalline polymorphism of mannan in plant cell walls and after recrystallisation |
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Authors: | H D Chanzy A Grosrenaud R Vuong W Mackie |
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Institution: | (1) Centre de Rechèrches sur les Macromolécules Végétales (CNRS), B.P.68, F-38402 Saint Martin D'Hères, France;(2) Astbury Department of Biophysics, University of Leeds, LS2 9JT Leeds, UK |
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Abstract: | Mannan-rich plant cell walls were mechanically disintegrated and chemically extracted in order to ascertain their morphology and structure by electron microscopy and electron diffraction. For Acetabularia crenulata and Codium fragile, the cell-wall fragments were found to consist of alkali-resistant fibrillar mannan II encrusted with alkali-soluble granular mannan I. In the case of ivory nuts (Phytelephas macrocarpa) there is, in addition, a microfibrillar cellulose component which was also identified. The mannan I—mannan II polymorphism was also obtained when various mannan fractions were recrystallized from solution. In these recrystallizations, the occurrence of one or the other polymorph was found to depend on several parameters: the molecular weight of the mannan, the temperature of crystallization and the polarity of the crystallization medium.Abbreviations DP
degree of polymerization
- EDTA
ethylenediaminetetraacetic acid
Affiliated with the Scientific and Medical University of Grenoble |
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Keywords: | Acetabularia Chlorophyta Codium Cell wall (mannan) Mannan polymorphism Phytelephas (cell wall) |
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