Data/hora: 16/05/2024 22:16:56

Biblioteca(s): | Embrapa Meio Ambiente.
Data corrente: | 28/03/1995
Data da última atualização: | 28/03/1995
Autoria: | MORAES, R. O.; MORAES, I. O.; CAPALBO, D. M. F.
Título: | Thermobacteriology an important factor on fermented product recuperation.
Ano de publicação: | 1995
Fonte/Imprenta: | In: INTERNATIONAL SYMPOSIUM ON SOLID STATE FERMENTATION, 2., 1995, Montpellier. Annals. Montpellier: ROUSSOS-OSRTOM, 1995.
Páginas: | p.53
Idioma: | Inglês
Conteúdo: | Bacillus thuringiensis (Bt), an aerobic bacterium used in biological control of insect pests is produced by submerged or solid state fermentation. After fermentation process, it is necessary to develop studies in product recuperation. In the case of Bt the toxin is the spore crystal complex, that is not thermoestable and constitutes a real problem because the preservation of the viability is associated to the thermal resistance of the microorganism and this is related to the time/temperature relationship. This paper presents studies on the thermobacteriological characteristics of the Bacillus thuringiensis, as the D value - Decimal reduction time, and z value - temperature coefficient of microbial destruction. These determinations were done after the fermentation process was finished, and the data obtained will be presented. They used a conventional dryer and a spray-dryer, where three different temperatures were used. The relative viability decreased as the spray dryed temperature incresead D values were 9.49s; 5.88s and 3.43s for initial temperatures of 120oC; 150oC and 180oC and z value was 135.16. Conventional drying at 50oC; 70oC and 90oC showed that at 90oC there was a reduction of viability with a D value of 5.86 h; but at 70oC and 50oC the viability was maintened and D value were 28.56 h. and 37.77 h. The conventional drying lasted 22.5 hours.
Palavras-Chave: | Biopesticide.
Thesagro: | Bacillus Thuringiensis.
Thesaurus Nal: | biological control; insect pests; solid state fermentation.
Categoria do assunto: | --
Registro original: | Embrapa Meio Ambiente (CNPMA)
Exemplares: | CNPMA - (2869-1) - ADD - PL - -- -  -  -  - DIS