Abstract:The secreted α-amylase with dominant activity was purified from the crude extract of Mon Thong durian by steps of ammonium sulphate precipitation and the affinity column chromatography. The purified α-amylase (DzAmy1) had a molecular mass of approximately 44 kDa. Its optimum pH and temperature for activity were 7.0 and 50°C, respectively. The enzyme was stable from pH 6 to 10 and from 30 to 60°C. Many metal ions did not affect amylase activity. The gene cloning of DzAmy1 was carried out and it was confirmed th… Show more
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