Abstract
The crystal structure of V h-amylose has been refined by a combined analysis of stereochemical conformation and packing, and by analysis of X-ray fibre diagrams. The unit cell is orthorhombic with a 13.65 Å, b 23.70 Å, and c (fibre repeat) 8.05 Å. The chain conformation is a left-handed, six-fold helix with O-6 in the gg ( gauche to O-5 and gauche to C-4) position. The water molecules are located inside the helix channel of the amylose and in the interstitial spaces of the helices, forming an intensive hydrogen-bonding network.
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