ISSN:
0006-3525
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Visually integrated, flat-plate film data were collected from oriented filaments of V amylose dehydrated made from dimethyl sulfoxide-amylose; and X-ray diffraction and stereochemical methods were used to search a multidimensional parameter space for the most satisfactory description of the crystal and molecular structure. Results indicate that the helical chains are left-handed and that they pack into the unit cell in an antiparallel arrangement conforming to space group P212121. Packing is very compact with several O …. O contacts in the range 2.70-2.85 Å between both parallel and antiparallel pairs of chains. Other characteristics of the final model are residue geometry similarity to residue 3 from potassium acetate-cyclohexamylose, O(2)i-O(3)i+1 distance of 2.75 Å, O(6) gg, and O(6)i-O(2)i-6 distance of 2.84 Å. Proton magnetic resonance studies of dried, crystalline V amylose dehydrate powder showed only 0.15 water per glucose residue.
Zusätzliches Material:
4 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/bip.1975.360140714
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