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Correlation between entomotoxicity potency and protease activity produced by Bacillusthuringiensis var. kurstaki grown in wastewater sludge

Paper ID Volume ID Publish Year Pages File Format Full-Text
36605 45138 2006 7 PDF Available
Title
Correlation between entomotoxicity potency and protease activity produced by Bacillusthuringiensis var. kurstaki grown in wastewater sludge
Abstract

Bacillus thuringiensis (Bt) production using wastewater sludge as a raw material was studied in bench scale fermentor at different sludge solids concentration. The highest cell and spore concentrations and entomotoxicity were observed at a suspended solids concentration of 20–25 g/l. Maximal protease activity also increased with solids concentration, however, it decreased after attaining a peak at about 36 h. Maximal protease activity (2.3–2.8 IU/ml) obtained at 25 and 20 g/l sludge suspended solids concentration was 1.75 and 1.5 times that of the maximal activity obtained at 15 g/l. Irrespective of the sludge suspended solids concentration, protease activity (until its peak) showed an exponential relationship with total cell count and a linear relationship with entomoxicity potency. An exponential correlation was also established between spore concentration and entomotoxicity. The correlations tested using a regression model were highly significant.

Keywords
Bacillus thuringiensis var. kurstaki; Wastewater sludge; Alkaline protease; Sporulation; Entomotoxicity
First Page Preview
Correlation between entomotoxicity potency and protease activity produced by Bacillusthuringiensis var. kurstaki grown in wastewater sludge
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 41, Issue 4, April 2006, Pages 794–800
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering