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Fractional extraction of acid polysaccharides from Carpinus betulus

A. Ebringerová, A. Kramár, and R. Domanský

Institut de chimie de V Academie slovaque des sciences, Bratislava 9

 

Abstract:  Two procedures of the fractional extraction of acid polysaccharides from the holocellulose of Klauditz were tested and compared. These procedures comprised a single acid and three alkaline steps. The analytical composition of particular fractions wras reviewed but the chief attention was given to the composition of acid portions of hydrolysates. Some uronic and aldouronic acids were isolated and identified which indicated the presence of other acid polysaccharides besides 4-O-methylglucuronoxylan. These polysaccharides were present mainly in the acid fraction irrespective whever its extraction wras performed before or after the alkaline extractions. The same polysaccharides were obtained by using a simple extraction of holocellulose by ammonium oxalate. On the basis of the composition and isolation procedure of these acid polysaccharides, it may bo supposed that the essential part of these substances originates from pectic substances which are always present in small amounts in wood.

Full paper in Portable Document Format: 2310a787.pdf (in French)

 

Chemical Papers 23 (10) 787–792 (1969)

Monday, May 27, 2024

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