Paul F. Micheel

Synthese von Polysacchariden. Neuere Ergebnisse der Getreide- und Brotforschung

• Broschiertes Buch

Produktbeschreibung

The chemical synthesis of polysaccharides is an old problem, wh ich has been studied for several decades without noteworthy success. We have accomplished this synthesis in three different ways. The most comprehen sive in application is the synthesis from mono-or disaccharides in dimethyl sulphoxide as solvent, at room temperature and under H-ion catalysis. If the water formed in the equilibrium between mono- and polysaccharides is removed, polysaccharides of molecular weights up to about 30. 000 are obtained. These are still soluble in water. Substantially higher molecular weight polysaccharides are not water soluble. Such polysaccharides were obtained from o-glucose, o-galactose, o-mannose, o-xylose, maltose, cellobiose, and lactose. The structural deter mination showed that they have, in the main, a highly branched structure. Since polysaccharides containing amino-sugars and uronic-acids occur very widely in nature, such polymers were synthesised in a similar manner from o-glucosamine, and others which contained o-glucuronic acid and o-glucose, o-glucuronic acid and o-glucosamine and o-glucose and o-glucosamine. Poly saccharides could be obtained by another method, from 1-fluoro-sugars in acid medium. The mechanism of this synthesis is different. Polysaccharides are formed from both hexose and pentose derivatives. A synthesis from 1-fluor-sugars in alkaline medium was more stereospecific. It is only suc cessful if for steric reasons, the formation of products of low molecular weight is not possible.

---

Hinweis: Dieser Artikel kann nur an eine deutsche Lieferadresse ausgeliefert werden.

Produktdetails

• Arbeitsgemeinschaft für Forschung des Landes Nordrhein-Westfalen .121
• Verlag: VS Verlag für Sozialwissenschaften
• 1963.
• Seitenzahl: 108
• Erscheinungstermin: 1. Januar 1963
• Deutsch
• Abmessung: 244mm x 170mm x 7mm
• Gewicht: 203g
• ISBN-13: 9783663030775
• ISBN-10: 3663030776
• Artikelnr.: 39153941

Inhaltsangabe

Synthese von Polysacchariden.- Diskussionsbeiträge Dr. phil., Dr. med. h. c. Fritz Gummen, Professor Dr. phil. Fritz Micheel, Professor Dr. phil. Burkhardt Helferich, Professor Dr. med. Walter Kikuth, Staatssekretär Professor Dr. h. c, Dr.-Ing. E. h. Leo Brandt, Professor Dr. med. Hans Hermann Weber.- Neuere Ergebnisse der Getreide- und Brotforschung.- Diskussionsbeiträge Professor Dr. phil. Hermann Ullrich, Professor Dr. sc. nat. habil. Paul F. Felshenke, Professor Dr. phil., Dr. rer. techn. Eduard Mückenhausen, Professor Dr. phil. Fritz Micheel, Dr. phil., Dr. med. h. c. Fritz Gummert, Professor Dr. phil. Ernst Peschl, Professor Dr. agr. Hans Braun.