Download Fiesers' Reagents for Organic Synthesis, Volume 20 by Tse-Lok Ho PDF

By Tse-Lok Ho

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Ten years later Brach and von Fiirth45 determined the stoichiometry of D-glucosamine and acetic acid production, found it to be a 1:1 ratio and concluded that chitin is a 'polymerised monoacetylglucosamine'. Karrer et al. 6 Interconversion of chitin and chitosan13 enzymatic degradation .. In both cases only traces of o-glucosamine were detected. 1), confirmed that chitin is a polymer composed of N-acetyl-o-glucosamine residues. 3 Ring size and position of the glycoside bond Contemporary work on the structure of cellulose In dealing with this aspect of chitin structure it is of interest to consider the development of structural theories for cellulose, as these had a considerable influence on the structures proposed for chitin.

134 Closer inspection of the X-ray diffraction patterns disclosed minor differences between the structures of the three samples. 6 A, and suggesting that the protein helix has approximately six subunits per turn but is a non-integral helix repeating after five turns to give a 153 A repeat. The layer lines in the pattern for Sirex are not appreciably split, indicating that the helix symmetry is close to being exactly 61 , while those in the pattern for Aphrodite chaetae are split much more than for Megarhyssa, indicating greater deviation from an exact 61 symmetry for the helix of protein subunits.

Samuels referred to this as the form II structure to distinguish it from the form I structure that he obtained for the as-cast film. 136 Sakurai et aU 3S Ogawa et al.

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