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Biopesticide production using Bacillus thuringiensis kurstaki by valorization of starch industry wastewater and effluent from aerobic,anaerobic digestion

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Systems Microbiology and Biomanufacturing 2021年第4期1卷 494-504页

作者： Adama Ndao B.Sellamuthu Lalit R.Kumar R.D.Tyagi J.R.Valero INRS-ETE Universite du QuebecQuebec G1K 9A9Canada Centre de Recherche du CHUM 900 Saint DenisMontrealQuebec H2X 0A9Canada BOSK Bioproducts 100-399 rue JacquardQuebec G1N 4J6Canada School of Technology Huzhou UniversityHuzhouChina

Introduction Unconventional alternatives such as aerobic and anaerobic effluent from starch industry contain essential nutrients for Btk active ingredient *** from starch industry is rich in carbon and nitrogen and can replace expensive feedstock used during the fermentation *** The main objective of this study was to achieve a biopesticide formulation from starch industry wastewater(SIW)with high entomotoxicity(UI/ml)of larvae comparable to Foray 76B,which is a commercial *** Bacillus thuringiensis var kurstaki HD1(Btk)strain was cultivated and sub-cultured to aerobic,anaerobic digested effluent and ***-treatment was carried on these different substrates to enhance the residual carbon required for Btk growth and delta endotoxin *** 48 hours of fermentation,cells count and delta-endotoxin were determined.A biopesticide formulation containing fermented broth and adjuvants was fed to larvae to determine larvae *** Btk cell growth and sporulation profile in SIW media displayed a high total cell count and viable spores compared to btk growth in anaerobic or aerobic media after 48h *** maximum endotoxin concentration in the SIW medium was 435μg/mL,whereas,in anaerobic and aerobic effluent,the maximum concentrations were at 161μg/mL and 136μg/mL,*** acidic treatment was performed at pH 2 for these substrates,entomotoxicity obtained from aerobic and anaerobic biopesticide formulations displayed significantly higher entomoxicity than the untreated *** entomotoxicity of SIW treated at pH 2 was equivalent to the standard Foray 76B which is 20,000 IU/μ*** Anaerobic and aerobic effluent did not contain enough total organic carbon to augment Btk growth and *** pre-treated at pH 2 provided significant organic matter for Btk growth and resulted in larval mortality equivalent to the com ercial biopesticide Foray 76B.

关键词： Bacillus thuringiensis Aerobic digested effluent Anaerobic digested effluent effluent valorization Biopesticide

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