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Acetolysis of α-d-glucans in the presence of 1,1,3,3-tetramethylurea

✍ Scribed by Takao Narui; Kunio Takahashi; Shoji Shibata

Publisher: Elsevier Science
Year: 1987
Tongue: English
Weight: 224 KB
Volume: 168
Category: Article
ISSN: 0008-6215
DOI: 10.1016/0008-6215(87)80019-8

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✦ Synopsis

Acetoly4 and partial hydrolysiti with acid are often applied to the chemical degradation of polysaccharides in order to elucidate their chemical structures by obtaining oligosaccharide fragments of various molecular sizes. On acetolysis, CPD-(1+6)-s!ycosidic linkages are cleaved relatively faster than a-(1+4), a-(1*3), and a-(1+2) linkages3A. whereas, on acid hydrolysis, the a-D-(1+4)-glycosidic linkages are the most readily cleawxW. Acetolysis is usually performed at low temperature in order to avoid irregular reaction and caramelization, therefore, it requires a long period of time to complete the reaction. Recently, in connection with our previous studies on the effect of 1,1,3,3-tetramethylurea (Me&J) on the allcylation of polysaccharides7~8, we found

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