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Production of Bacillus thuringiensis ‐based biopesticides in batch and fed batch cultures using wastewater sludge as a raw material
Author(s) -
Yezza A,
Tyagi RD,
Valéro JR,
Surampalli RY
Publication year - 2005
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1204
Subject(s) - bacillus thuringiensis , raw material , biopesticide , wastewater , spore , pulp and paper industry , sequencing batch reactor , fermentation , food science , microbiology and biotechnology , biology , chemistry , environmental science , botany , bacteria , environmental engineering , pesticide , agronomy , ecology , genetics , engineering
Bacillus thuringiensis subsp kurstaki was grown in batch and fed batch cultures using wastewater sludge as a raw material. A simple fed batch strategy based on dissolved oxygen measurement during the fermentation cycle was developed in this work. It was established that while shifting the process strategy from batch to fed batch, the maximum spore concentration was increased from 5.62 × 10 8 to 8.6 × 10 8 colony forming units per cm 3 and resulted in an increase of entomocidal activity from 13 × 10 9 to 18 × 10 9 spruce budworm potency units per dm 3 . Higher entomotoxicity was recorded at low spore concentration using wastewater sludge as a raw material whereas low entomotoxicity was reported at high spore concentration in synthetic medium. Copyright © 2005 Society of Chemical Industry