Synthese Von Polysacchariden. Neuere Ergebnisse Der Getreide- Und Brotforschung Paul F Micheel

ISBN: 9783663030775

Published: January 1st 1963

Paperback

105 pages


Description

Synthese Von Polysacchariden. Neuere Ergebnisse Der Getreide- Und Brotforschung  by  Paul F Micheel

Synthese Von Polysacchariden. Neuere Ergebnisse Der Getreide- Und Brotforschung by Paul F Micheel
January 1st 1963 | Paperback | PDF, EPUB, FB2, DjVu, audiobook, mp3, RTF | 105 pages | ISBN: 9783663030775 | 3.37 Mb

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 synthesisMoreThe 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.



Enter the sum





Related Archive Books



Related Books


Comments

Comments for "Synthese Von Polysacchariden. Neuere Ergebnisse Der Getreide- Und Brotforschung":


awkwardandsons.com

©2009-2015 | DMCA | Contact us