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Influence of media composition on the production of delta-endotoxin by Bacillus thuringiensis var. thuringiensis.

Mummigatti, S. G. and Raghunathan, A. N. (1990) Influence of media composition on the production of delta-endotoxin by Bacillus thuringiensis var. thuringiensis. Journal of invertebrate pathology, 55 (2). pp. 147-51. ISSN 0022-2011

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Abstract

Powders of edible leguminous seeds, greengram (Vigna radiata) or soybean (Glycine max), were used as the major protein source with different combinations of soluble starch and/or cane sugar molasses as the major carbohydrate source for the production of delta-endotoxin by Bacillus thuringiensis var. thuringiensis serotype 1 in submerged fermentation. The primary product (lyophilized with 6 g of lactose) yield was 8.7 to 9.1 g/liter from media with dehusked greengram powder and 9.7 to 10.3 g/liter from media with defatted soybean powder in basal medium. The toxicity of primary products was assayed against fifth-instar Bombyx mori larvae by force-feeding. The primary product from the medium containing defatted soybean powder and soluble starch gave a maximum viable spore count of 91.3 x 10(6)/mg, with a corresponding potency of 35,800 IU/mg, whereas the medium containing dehusked greengram powder and cane sugar molasses gave a spore count of 49.5 x 10(6)/mg, with a highest potency of 38,300 IU/mg. Either legume protein in combination with cane sugar molasses yielded primary product 2.1 to 2.4 times more potent than the U.S. standard. The combined carbohydrate source consisting of soluble starch and cane sugar molasses, irrespective of the source of protein in the media, drastically reduced delta-endotoxin production, thereby reducing the potency of the primary products compared to the U.S. standard.

Item Type: Article
Uncontrolled Keywords: Bacillus thuringiensis var. thuringiensis; Vigna radiata; Glycine max; Bombyx mori; submerged fermentation: &endotoxin; primary product; viable spore count; International Units; potency.
Subjects: 600 Technology > 01 Medical sciences > 17 Toxicology
600 Technology > 08 Food technology > 22 Legumes-Pulses
Divisions: Food Protectants and Infestation Control
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 30 Mar 2016 10:13
Last Modified: 30 Mar 2016 10:13
URI: http://ir.cftri.com/id/eprint/2349

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