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- W1997733766 abstract "A new structure is proposed for the polysaccharide chitin, [C8H13O5N]n. X-ray diffraction fibre photographs of lobster tendon reveal a well-defined orthorhombic lattice with the space group P212121 and cell dimensions of a = 4.69 Å, b = 19.13 Å, and c = 10.43 Å (fibre repeat). It is suggested that the unit cell contains two polysaccharide chains running in opposite directions and four asymmetric N-acetyl-glucosamine units which gives a density in close agreement with the observed experimental value of 1.42 g/ml. The structure was arrived at by a trial and error method, with the aid of an optical diffractometer for testing the diffraction patterns of the various possibilities suggested by stereochemical considerations. The structure finally arrived at, is in good agreement with infra-red absorption data, and has no short contacts. The chains are separated by a distance of 4.69 Å perpendicular to the “plane” of the sugar rings and consequently the NH and CO groups in the neighbouring aminoacetyl side chains are hydrogen bonded, the plane of the amide groups in the “trans” configuration being almost perpendicular to the fibre axis. The hydroxymethyl side chains containing a hydroxyl group are also hydrogen bonded, the OH of one being linked to the oxygen of a similar group from a neighbouring chain running in the opposite direction. The short hydroxyl group is intrahydrogen bonded to the oxygen of the amide group in the same asymmetric unit. The calculated intensities for the proposed set of coordinates are in fairly good agreement with observed X-ray intensities visually estimated from fibre photographs." @default.
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- W1997733766 date "1960-01-01" @default.
- W1997733766 modified "2023-10-16" @default.
- W1997733766 title "The structure of chitin" @default.
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- W1997733766 doi "https://doi.org/10.1016/0006-3002(60)91597-3" @default.
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