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Corrosion and stability study of Bacillus thuringiensis var. kurstaki starch industry wastewater-derived biopesticide formulation.

Gnepe, Jean Robert; Tyagi, Rajeshwar Dayal; Brar, Satinder Kaur; Valéro, José R.; Surampalli, Rao Y. (2014). Corrosion and stability study of Bacillus thuringiensis var. kurstaki starch industry wastewater-derived biopesticide formulation. Journal of Environmental Science and Health, Part B , vol. 49 , nº 11. p. 889-896. DOI: 10.1080/03601234.2014.938561.

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Résumé

Biopesticides are usually sprayed on forests by using planes made up of aluminum alloy. Bioval derived from starch industry wastewater (SIW) in suspension form was developed as stable anticorrosive biopesticide formulation. In this context, various anticorrosion agents such as activated charcoal, glycerin, ethylene glycol, phytic acid, castor oil and potassium silicate were tested as anticorrosive agents. There was no corrosion found in Bioval formulation where potassium silicate (0.5% w/v) was added and compared with Foray 76 B, as an industrial standard, when stored over 6 months. In relation to other parameters, the anticorrosion formulation of Bioval+buffer+KSi reported excellent zeta potential (-33.19 ± 4 mV) and the viscosity (319.13 ± 32 mPa.s) proving it's stability over 6 months, compared to the standard biopesticide Foray 76 B (-36.62 ± 4 mV potential zeta, pH 4.14 ± 0.1 and 206 ± 21 mPa.s viscosity). Metal analysis of the different biopesticides showed that Bioval+buffer+KSi has no corrosion (5.11 ± 0.5 mg kg⁻¹ of Al and 13.53 ± 1.5 mg kg⁻¹ of Fe) on the aluminum alloy due to the contribution of sodium acetate buffer at pH 5. The bioassays reported excellent results for Bioval+Buffer+KSi (2.95 ± 0.3 x 10⁹ CFU mL⁻¹ spores and 26.6 ± 2.7 x 10⁹ IU L⁻¹ Tx) compared with initial Bioval (2.46 ± 0.3 x 10⁹ CFU mL⁻¹ spores and 23.09 ± 3 x 10⁹ IU L⁻¹ Tx) and Foray 76 B (2.3 ± 0.2 10⁹ CFU mL⁻¹ spores and 19.950 ± 2.1 UI L⁻¹ Tx) which was due to the break-up of the external chitinous membrane due to abrasive action of potassium silicate after ingestion by insects. The contribution of sodium acetate buffer and potassium silicate (0.5% and at pH = 5) as anticorrosion agent in the Bioval allowed production of an efficient biopesticide with a reduced viscosity and favorable pH as compared to Foray 76 B which enhanced the entomotoxic potential against spruce budworm (SB) larvae (Lepidoptera: Choristoneura fumiferana).

Type de document: Article
Mots-clés libres: starch industry; wastewater; Bacillus thuringiensis; biopesticide; corrosion; entomotoxicity
Centre: Centre Eau Terre Environnement
Date de dépôt: 11 avr. 2018 20:09
Dernière modification: 11 avr. 2018 20:09
URI: http://espace.inrs.ca/id/eprint/3763

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