Download An Introduction to Polysaccharide Biotechnology by Stephen E. Harding, Michael P. Tombs, Gary G. Adams, Berit PDF

By Stephen E. Harding, Michael P. Tombs, Gary G. Adams, Berit Smestad Paulsen, Kari Tvete Inngjerdingen, Hilde Barsett

ISBN-10: 148224697X

ISBN-13: 9781482246971

Polysaccharides and similar excessive molecular weight glycans are highly assorted with large program in Biotechnology and nice possibilities for additional exploitation. An advent to Polysaccharide Biotechnology – a moment variation of the preferred unique textual content through Tombs and Harding – introduces scholars, researchers, clinicians and industrialists to the homes of a few of the major fabrics concerned, how those are utilized, a number of the fiscal components touching on their creation and the way they're characterised for regulatory purposes.

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Although the theoretical limits are Lp = 0 (random coil) and infinity (rigid rod), practically the range is from ~1–2 nm (random coil) to ~200 nm (rigid rod). 14). 7 ORDERED STRUCTURE Several commercially important polysaccharides such as xanthan, κ-carrageenan, schizophyllan and agarose are known to possess secondary structure (helices) under certain conditions. This will affect the optical activity of the polysaccharide: this in turn is manifested by the ability of a substance to absorb light at certain wavelengths depending on the plane of polarization of that light (a phenomenon known as circular dichroism [CD]) and also will rotate the plane of polarization at any wavelength (optical rotatory dispersion [ORD]).

Starch usually occurs as an insoluble mixture of two forms, as grains with considerable radial structure. Amylose, amylopectin and glycogen are all built from α-d-glucose residues through 1→4 links, but differ in the degree of branching. Amylose is unbranched, with a DP of about 1000 though it may have a few 1→6 links in the chain, while amylopectin is branched through 1→6 linkages at about every 20–25 residues and has a DP of around 1 million. Glycogen is more highly branched, at every tenth residue, and has a DP of about 100,000.

Clearly the side chains modify its properties and its role in the wall structure is unclear: they certainly interact with both the cellulose and the pectin, and covalent links may be involved with the latter. 6 HETEROXYLANS These are chains of (1→4) linked β-d-xylopyranosyl residues, with extensive side chains, and the main chain can also be acetylated. They may also carry phenols. These too make up part of the fibrous structure of the wall. 7 GALACTOMANNANS, GLUCOMANNANS AND GALACTOGLUCOMANNANS These, as their names suggest, contain galactose residues, and glucose residues attached as side chains to the main mannan chain.

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