Insoluble dietary fibre changes in lignocellulosic wastes after cultivation of fungi
1999
Lewandowska, M. (Olsztyn Univ. of Agriculture and Technology (Poland). Chair of Food Biotechnology) | Bednarski, W. | Kmita-Glazewska, H.
The studies were carried out on the biodegradation of two lignocellulosic substrates, i.e. faba bean hulls and wheat wastes, by fungi Trichoderma reesei and Aspergillus niger. The composition of water insoluble fraction of dietary fibre (IDF) was examined, i.e. the proportions of simple sugars (glucose, galactose, mannose, arabinose, xylose, fucose and rhammnose). The changes in IDF composition were determined as affected by the culturing method (single or mixed fungus culture). The degradation of insoluble dietary fibre was found to be about 50/ in each of the lignocellulosic material, irrespective of the culturing method. The dietary fibre in faba bean hulls was more susceptible to degradation during growing of A. niger fungus, whereas that in wheat wastes was more susceptible to degradation during growing of T. reesei fungus. The changes in the proportions of galactose and mannose in the IDF of faba bean hulls may prove that the structure of galactomannans was broken. On the other hand, the differences in the proportions of arabinose, xylose and rhammnose in IDF of wheat wastes suggest the degradation of arabinoxylans from the group of plant mucuses.
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