B-chitin

This paper is a review of x-ray diffraction work in the authors laboratory to refine the structures of cellulose I and II, and a- and B-chitin, concentrating on the methods used to select between alternate models. Cellulose I is shown to consist of an array of parallel chains, and this conclusion is supported by a separate refinement based on electron diffraction data. In the case of cellulose II, both parallel and antiparallel chain... 

FIGURE 3.3 Structure of polysaccharides (a) cellulose, (b) chitin, (c) chitosan, and (d) dextran. 

FIGURE 7 The SEM images of (a) chitin dispersion obtained using AMIMBr, (b) chitin nanofiber film, (c) regenerated chitin obtained using l-butyl-3-methylimidazolium acetate, (d) and chitin nonofiber-PVA composite film. 

FIGURE 9 The DSC profiles of (a) PVA, (b) chitin nanofiber-PVA composite film, and... 

Structural Polysaccharides Structural (fibrous) components are found in cell walls of plants and are represented by the linear p (1—4)-linked homopolysaccharides (a) cellulose, (b) chitin, (c) xylan, (d) mannan (10.20). Of these, cellulose is by far the most universally abundant and the most important. Starch (10.20e) derivatives are important in food technology (Chapter 12.4). 

Fig. 4. Scanning electron micrographs of iodine-poly saccharides (A) H-alg., (B) chitin.

Without using dissolved chitin, a sponge-hke gel can be obtained using a crushed chitin made of b-chitin from a squid. This is used for wound dressing and good results have been reported [18]. 

Fig. 1 Tensile test result for a) chitin and chitosan, b) chitin chitosan doped with O.Ig silver sulfate, c) chitin chitosan doped with 0.3g silver sulfate, d) chitin chitosan doped with 0.5g silver sulfate, e) chitin chitosan doped with 0.7g silver sulfate...

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