INVESTIGATIONS ON POTATO PULP AS A DIETARY FIBER SOURCE - COMPOSITIONOF POTATO PULP AFTER INFLUENCE OF PECTINASES AND CELLULASES AND ENZYMATIC DEGRADATION OF STARCH

The composition of alcohol insoluble substances (AIS) of potato pulp h ave been investigated after succesive degradation with different pecto lytic and cellulolytic enzymes followed by starch degrading enzymes. T he pretreatment with pectinase/cellulase combinations has a significan t influence on the amount and the properties of the residues after sta rch degradation. Furthermore the most important changes in the composi tion were found in the receiving residues after action of amylolytic e nzymes. A correlation exists between the content of residual starch in the residues and the action of the cell wall degrading enzymes. The a mount of residual starch correlates negatively with the intensity of c ell wall degradation. The enzymatic susceptibility of starch depends o n the damage of cell wall of potato pulp, especially on the degree of degradation of the cellulose. The water binding capacity decreases int ensively after action of pectinase/cellulase combinations. The treatme nt with amylolytic enzymes causes only a negligible variation of the w ater binding capacity.