Studies on the amylase characterization revealed that the
optimum temperature of this enzyme was 90ºC. The enzyme was stable for 1 h at temperatures ranging from 40-
50ºC while at 90ºC, 66% of its maximum activity was lost. However, in the presence of 5 mM CaCl2, the enzyme
was stable at 90ºC for 30 min and retained about 58% residual activity after 1 h. The optimum pH of the enzyme
was found to be 8.5. After incubation of enzyme for 2 h at pH 9.5 and 11.0 was observed a decrease of about
6.3% and 16.5% of its original activity. At pH 6.0 the enzyme lost about 36% of its original activity. The enzyme
was strongly inhibited by Co2+, Cu2+ and Ba2+, but less affected by Mg2+, Na+ and K+. In the presence of 2.0
M NaCl, 63% of amylase activity was retained after 2 h incubation at 45ºC. The amylase exhibited more than
70% activity when incubated for 1 h at 50ºC with sodium dodecyl sulphate. However, very little residual
activity was obtained with sodium hypochlorite and with hydrogen peroxide the enzyme was completely
inhibited. The compatibility of Bacillus sp SMIA-2 amylase with certain commercial detergents was shown to
be good as the enzyme retained 86%, 85% and 75% of its activity after 20 min incubation at 50ºC in the
presence of the detergent brands Omo®, Campeiro® and Tide®, respectively.
Studies on the amylase characterization revealed that theoptimum temperature of this enzyme was 90ºC. The enzyme was stable for 1 h at temperatures ranging from 40-50ºC while at 90ºC, 66% of its maximum activity was lost. However, in the presence of 5 mM CaCl2, the enzymewas stable at 90ºC for 30 min and retained about 58% residual activity after 1 h. The optimum pH of the enzymewas found to be 8.5. After incubation of enzyme for 2 h at pH 9.5 and 11.0 was observed a decrease of about6.3% and 16.5% of its original activity. At pH 6.0 the enzyme lost about 36% of its original activity. The enzymewas strongly inhibited by Co2+, Cu2+ and Ba2+, but less affected by Mg2+, Na+ and K+. In the presence of 2.0M NaCl, 63% of amylase activity was retained after 2 h incubation at 45ºC. The amylase exhibited more than70% activity when incubated for 1 h at 50ºC with sodium dodecyl sulphate. However, very little residualactivity was obtained with sodium hypochlorite and with hydrogen peroxide the enzyme was completelyinhibited. The compatibility of Bacillus sp SMIA-2 amylase with certain commercial detergents was shown tobe good as the enzyme retained 86%, 85% and 75% of its activity after 20 min incubation at 50ºC in thepresence of the detergent brands Omo®, Campeiro® and Tide®, respectively.
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