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Polysaccharides

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Source: Wikipedia. Pages: 47. Chapters: Cellulose, Polysaccharide, Hemicellulose, Agar, Glycogen, Pectin, Chitin, Beta-glucan, Chi... Weiterlesen
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Beschreibung

Source: Wikipedia. Pages: 47. Chapters: Cellulose, Polysaccharide, Hemicellulose, Agar, Glycogen, Pectin, Chitin, Beta-glucan, Chitosan, Carrageenan, Cyclodextrin, Sugammadex, Hypromellose, Xanthan gum, Glucomannan, Alginic acid, Lentinan, Amylose, Dextran, FBCx, Alguronic acid, Glycocalyx, Fucoidan, Amylopectin, Icodextrin, Maltodextrin, Mucilage, Mixed-linkage glucan, Levan polysaccharide, Pleuran, Ficoll, Galactomannan, Fructan, Gellan gum, Pentastarch, Natural gum, Porphyran, Lichenin, Chrysolaminarin, Polydextrose, Welan gum, Oxidized cellulose, Xyloglucan, Pullulan, Zymosan, Kefiran, Arabinoxylan, Schizophyllan, Cellodextrin, Sizofiran, MatrixDB, Curdlan, Galactoglucomannan, Sepharose, Selective Relaxant Binding Agent, DEAE-Sepharose, Callose, Paramylon, Alpha glucan, Polysaccharide Peptide, Homopolysaccharide, Cellulin. Excerpt: ß-Glucans (beta-glucans) are polysaccharides of D-glucose monomers linked by ß-glycosidic bonds. ß-glucans are a diverse group of molecules that can vary with respect to molecular mass, solubility, viscosity, and three-dimensional configuration. They occur most commonly as cellulose in plants, the bran of cereal grains, the cell wall of baker's yeast, certain fungi, mushrooms and bacteria. Some forms of beta glucans are useful in human nutrition as texturing agents and as soluble fiber supplements, but can be problematic in the process of brewing. Yeast and medicinal mushroom derived ß-glucans are notable for their ability to modulate the immune system. Research has shown that insoluble (1,3/1,6) ß-glucan, has greater biological activity than that of its soluble (1,3/1,4) ß-glucan counterparts. The differences between ß-glucan linkages and chemical structure are significant in regards to solubility, mode of action, and overall biological activity. Examples of various ß-glucan glycosidic linkages.Glucans are polysaccharides that contain only glucose as structural components, and are linked with ß-glycosidic bonds. In general, one distinguishes between a- and ß-glycosidic bonds, depending on whether the substituent groups on the carbons flanking the ring oxygen are pointing in the same or opposite directions in the standard way of drawing sugars. An a-glycosidic bond for a D-sugar emanates below the plane of the sugar, whereas the hydroxyl (or other substituent group) on the other carbon points above the plane (opposite configuration), while a ß-glycosidic bond emanates above that plane. The numbers 1,4, and 6 identify the carbon atoms at each end of the glycosidic bond. Numbering starts next to the ring oxygen (See glucose). Glucose molecule, showing carbon numbering notation and ß orientation.By definition, beta-glucans are chains of D-glucose polysaccharides, linked by beta type glycosidic bonds. These six-sided D-glucose rings can be connected to one another, on a

Produktinformationen

Titel: Polysaccharides
Untertitel: Cellulose, Polysaccharide, Hemicellulose, Agar, Glycogen, Pectin, Chitin, Beta-glucan, Chitosan, Carrageenan, Cyclodextrin, Sugammadex, Hypromellose, Xanthan gum, Glucomannan, Alginic acid, Lentinan, Amylose, Dextran, FBCx, Alguronic acid
Editor:
EAN: 9781157565222
ISBN: 978-1-157-56522-2
Format: Kartonierter Einband
Herausgeber: Books on Demand
Anzahl Seiten: 96
Gewicht: g
Größe: H3mm x B246mm x T189mm
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