Ultrasonic depolymerization of the chitin–glucan isolated from Aspergillus niger
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چکیده
By means of ultrasonication two fractions of the carboxymethylated chitin–glucan complex isolated from the cell walls of 13 the filamentous fungus Aspergillus niger were obtained. Elemental analysis as well as C NMR investigation of the high-molecular weight (M 680 kDa) and low-molecular weight (M 75 kDa) fractions revealed their essentially different w w chitin content. HPLC analysis of the fractions produced by ultrasonic treatment of different duration, combined with nitrogen assay showed steadily increasing chitin content in the faster eluted fraction that allows one to suggest the different susceptibility of the two components of the chitin–glucan complex to the ultrasonication. 1999 Elsevier Science B.V. All
منابع مشابه
Chemical morphology of glucan and chitin in the cell wall of the yeast phase of Paracoccidioides brasiliensis.
Short and thick fibers were observed on the outer surface of the yeast phase of Paracoccidioides brasiliensis, and long and thin fibers were seen on the inner surface. The long fibers disappear with chitinase treatment and are composed of chitin. The short fibers disappear under alkali treatment and are composed of alpha-glucan. Comparisons with alpha-(1 --> 3)-glucan isolated from Aspergillus ...
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