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IJBB Vol.46(5) [October 2009] >


Title: Partial purification and some properties of -amylase from Bacillus subtilis KIBGE-HAS
Authors: Bano, Saeeda
Qader, Shah Ali Ul
Aman, Afsheen
Azhar, Abid
Keywords: -Amylase
Bacillus sp.
Surfactant
Metal ions
Thermal stability
Issue Date: Oct-2009
Publisher: CSIR
Abstract:  An extracellular -amylase from Bacillus subtilis KIBGE-HAS was partially purified by ultrafiltration and ammonium sulphate precipitation with 19.2-fold purification and specific activity of 4195 U/mg. The enzyme showed relatively high thermostability and retained 62% of its activity when kept at 70°C for 15 min. -Amylase was highly stable at -18°C and loss of activity was very low during stability study. Metal ions like Mn2+, Ca2+, Co2+, K+, Mg2+, and Fe3+ activated the enzyme, while Hg2+ Ba2+, Cu2+, Na+ and Al3+ strongly inhibited the activity. The α-amylase was highly stable in various surfactants and detergents. In the presence of surfactants such as SDS and Triton X-100 the enzyme activity was found 2.9 and 1.8-fold higher respectively than control. The non-ionic detergents (Tween 20 and Tween 80) exhibited slightly inhibitory effect on the enzyme activity.
Page(s): 401-404
ISSN: 0975-0959 (Online); 0301-1208 (Print)
Source:IJBB Vol.46(5) [October 2009]

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