An amylase enzyme from pitaya peel was purified 234.2-folds with 72.1% recovery using ammonium
sulphate precipitation, gel filtration and ion exchange chromatography. Gel filtration chromatography
and SDS–PAGE revealed that the enzyme is monomeric with a molecular weight of 42.1 kDa. The
apparent Km and Vmax of the amylase were 2.7 mg/ml and 34.30 u/min/mg of protein, respectively. The
enzyme was highly active and stable over a wide pH range from pH 3 to pH 11.0, with optimum activity
being observed at pH 5.0. The enzyme was highly selective for soluble starch, amylopectin, glycogen and
pulullan. The purified amylase did not require calcium and displayed extreme stability with regard to
surfactants and oxidising agents. EDTA, a powerful chelating agent, did not have any significant effect
on the stability of the enzyme. Such characteristics have not been previously reported for this type
of enzyme from fruit peel. This enzyme, which possesses unique properties, could be widely used in
different types of industries, especially in food and biotechnological applications.
An amylase enzyme from pitaya peel was purified 234.2-folds with 72.1% recovery using ammoniumsulphate precipitation, gel filtration and ion exchange chromatography. Gel filtration chromatographyand SDS–PAGE revealed that the enzyme is monomeric with a molecular weight of 42.1 kDa. Theapparent Km and Vmax of the amylase were 2.7 mg/ml and 34.30 u/min/mg of protein, respectively. Theenzyme was highly active and stable over a wide pH range from pH 3 to pH 11.0, with optimum activitybeing observed at pH 5.0. The enzyme was highly selective for soluble starch, amylopectin, glycogen andpulullan. The purified amylase did not require calcium and displayed extreme stability with regard tosurfactants and oxidising agents. EDTA, a powerful chelating agent, did not have any significant effecton the stability of the enzyme. Such characteristics have not been previously reported for this typeof enzyme from fruit peel. This enzyme, which possesses unique properties, could be widely used indifferent types of industries, especially in food and biotechnological applications.
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