The amylase from pitaya peel exhibited the highest activity towards starch.
The enzyme also displayed lower amylase activity on amylopectin, glycogen and pulullan, at 90%, 82% and 70%, respectively, of the starch-substrate activity. These results indicate that the enzyme has the capability of cleaving long chains (i.e., alpha-1,6 bonds).
The enzyme partially hydrolysed maltooligosaccharide but did not achieve any significant (p < 0.05) hydrolysis of a/b-cyclodextrin (Fig. 4a)