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Applied Microbiology and Biotechnology

, Volume 77, Issue 5, pp 1023–1031 | Cite as

Production of surfactant and detergent-stable, halophilic, and alkalitolerant alpha-amylase by a moderately halophilic Bacillus sp. Strain TSCVKK

  • Kondepudi Kanthi Kiran
  • T. S. Chandra
Biotechnologically Relevant Enzymes and Proteins

Abstract

A moderately halophilic alkalitolerant Bacillus sp. Strain TSCVKK, with an ability to produce extracellular halophilic, alkalitolerant, surfactant, and detergent-stable alpha-amylase was isolated from soil samples obtained from a salt-manufacturing industry in Chennai. The culture conditions for higher amylase production were optimized with respect to NaCl, substrate, pH, and temperature. Maximum amylase production of 592 mU/ml was achieved in the medium at 48 h with 10% NaCl, 1% dextrin, 0.4% yeast extract, 0.2% tryptone, and 0.2% CaCl2 at pH 8.0 at 30 °C. The enzyme activity in the culture supernatant was highest with 10% NaCl at pH 7.5 and 55 °C. The amylase that was partially purified by acetone precipitation was highly stable in various surfactants and detergents. Glucose, maltose, and maltooligosaccharides were the main end products of starch hydrolysis indicating that it is an alpha-amylase.

Keywords

Moderate halophile Bacillus sp. Strain TSCVKK Alpha-amylase Alkalitolerant Surfactant stable Detergent stable 

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Biochemistry Laboratory, Department of ChemistryIndian Institute of Technology MadrasChennaiIndia
  2. 2.Department of BiotechnologyIndian Institute of Technology MadrasChennaiIndia

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