Single crystals and oriented crystallization of ivory nut mannan

Biopolymers - Tập 18 Số 4 - Trang 887-898 - 1979
Henri Chanzy1,2,3, M. Dubé1, R. H. Marchessault4,2,3, J.‐F. Revol4
1Centre de Recherches sur les Macromolécules Végétales, C.N.R.S., 53 X, 38041 Grenoble Cédex, France
2Henri Chanzy, Centre de Recherches sur les Macromolécules Végétales, C.N.R.S., 53 X, 38041 Grenoble Cédex, France
3R. H. Marchessault, Chemistry Department, Université de Montréal, C.P. 6210, Succursale A, Montreal, Québec H3C 3V1, Canada
4Chemistry Department, Université de Montréal, C.P. 6210, Succursale A, Montreal, Québec H3C 3V1, Canada

Tóm tắt

AbstractThe preparation of lamellar single crystals of mannan[poly((1 → 4)‐β‐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 Å and b = 8.92 Å, and the systematic absences observed confirm the proposed P212121 group. It was found that cellulose microfibrils from Valonia ventricosa 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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Thông tin xuất bản

Biopolymers

Tập 18 Số 4

887-898

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