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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
08/01/2019 |
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Data da última atualização: |
30/03/2023 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
ASSALIN, M. R.; SOUZA, D. R. C. de; ROSA, M. A.; DUARTE, R. C. R. M.; DONAIRE, P.; DURAN, N. |
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Afiliação: |
MARCIA REGINA ASSALIN, CNPMA; DEBORA RENATA CASSOLI DE S DUTRA, CNPMA; MARIA APARECIDA ROSA, CNPMA; R. C. R. M. Duarte; Patricia P. R. Donaire, Center of Natural and Human Sciences, Universidade Federal do ABC, Santo Andre, SP; Nelson Duran, Laboratory of Urogenital Carcinogenesis and Immunotherapy, Department of Structural and Functional Biology/UNICAMP; NanoBioss, Institute of Chemistry/UNICAMP; Nanomedicine Research Unit/UFABC. |
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Título: |
Ecotoxicity evaluation: preparation of poly-E-caprolactone and chitosan nanoparticles as carriers of thiametoxam pesticide. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
In: INTERNATIONAL CONFERENCE ON HEALTH AND SAFETY ISSUES RELATED TO NANOMATERIALS FOR A SOCIALLY RESPONSIBLE APPROACH - NANOSAFE, 6., 2018, Grenoble. Book of Abstracts... Grenoble: 2018. Ref. A91473MA. |
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Páginas: |
p. 198. |
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Idioma: |
Português |
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Conteúdo: |
Huanglongbing (HLB) is probably the most serious disease of citrus, nowadays. The severity of disease is mainly the rapid and efficient dissemination of the bacteria associated with HLB by psyllids Diaphorina citri (D. citri) and the absence of genetic resistance in citrus. Chemical control is the main way to control the psyllids, and there are different insecticides registered for this purpose. Thiamethoxam (neonicotinoid insecticide) is one of the active ingredients used in the control of HLB. Pesticide formulations nanocapsules allow a controlled release of active as well as protection against their premature degradation, allowing the use of conventional insecticide in a more sustainable way. Thus, studies of the effectiveness of encapsulated pesticide formulations are extremely important for enabling its use in agriculture. This study reports the encapsulation of the insecticide thiamethoxam in polymeric particles from poly-?-caprolactone (PCL) and chitosan by double emulsion and solvent evaporation method using different concentrations of chitosan and two Pluronic (poloxamer) copolymers, F 127 and F68. These nanoparticles were characterized in terms of size, polydispersity, and encapsulation efficiency. The microalgae Pseudokirchneriella subcapitata (bioindicator chloroficea) was used to evaluate to ecotoxicity of nanopesticide in comparation of commercial formulation. The nanopesticide obtained resulted in homogeneous and monodisperse particles, with the mean diameter obtained of 166.3 nm, polydispersity indices were lower than 0.4 and positive superficial charge (+25 mv).The encapsulation efficiency, measured by by liquid chromatography, it was 34%. The ecotoxicity results demonstrated that the nanopesticide was less toxic that commercial formulations, in the same concentrations. MenosHuanglongbing (HLB) is probably the most serious disease of citrus, nowadays. The severity of disease is mainly the rapid and efficient dissemination of the bacteria associated with HLB by psyllids Diaphorina citri (D. citri) and the absence of genetic resistance in citrus. Chemical control is the main way to control the psyllids, and there are different insecticides registered for this purpose. Thiamethoxam (neonicotinoid insecticide) is one of the active ingredients used in the control of HLB. Pesticide formulations nanocapsules allow a controlled release of active as well as protection against their premature degradation, allowing the use of conventional insecticide in a more sustainable way. Thus, studies of the effectiveness of encapsulated pesticide formulations are extremely important for enabling its use in agriculture. This study reports the encapsulation of the insecticide thiamethoxam in polymeric particles from poly-?-caprolactone (PCL) and chitosan by double emulsion and solvent evaporation method using different concentrations of chitosan and two Pluronic (poloxamer) copolymers, F 127 and F68. These nanoparticles were characterized in terms of size, polydispersity, and encapsulation efficiency. The microalgae Pseudokirchneriella subcapitata (bioindicator chloroficea) was used to evaluate to ecotoxicity of nanopesticide in comparation of commercial formulation. The nanopesticide obtained resulted in homogeneous and monodisperse particles, with the mean diameter ... Mostrar Tudo |
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Palavras-Chave: |
HBL. |
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Thesagro: |
Pesticida; Toxicologia. |
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Categoria do assunto: |
W Química e Física |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/189957/1/RA-AssalinMR-et-al-Nanosafe2018-p198.pdf
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Marc: |
LEADER 02625nam a2200217 a 4500
001 2103279
005 2023-03-30
008 2018 bl uuuu u00u1 u #d
100 1 $aASSALIN, M. R.
245 $aEcotoxicity evaluation$bpreparation of poly-E-caprolactone and chitosan nanoparticles as carriers of thiametoxam pesticide.$h[electronic resource]
260 $aIn: INTERNATIONAL CONFERENCE ON HEALTH AND SAFETY ISSUES RELATED TO NANOMATERIALS FOR A SOCIALLY RESPONSIBLE APPROACH - NANOSAFE, 6., 2018, Grenoble. Book of Abstracts... Grenoble: 2018. Ref. A91473MA.$c2018
300 $ap. 198.
520 $aHuanglongbing (HLB) is probably the most serious disease of citrus, nowadays. The severity of disease is mainly the rapid and efficient dissemination of the bacteria associated with HLB by psyllids Diaphorina citri (D. citri) and the absence of genetic resistance in citrus. Chemical control is the main way to control the psyllids, and there are different insecticides registered for this purpose. Thiamethoxam (neonicotinoid insecticide) is one of the active ingredients used in the control of HLB. Pesticide formulations nanocapsules allow a controlled release of active as well as protection against their premature degradation, allowing the use of conventional insecticide in a more sustainable way. Thus, studies of the effectiveness of encapsulated pesticide formulations are extremely important for enabling its use in agriculture. This study reports the encapsulation of the insecticide thiamethoxam in polymeric particles from poly-?-caprolactone (PCL) and chitosan by double emulsion and solvent evaporation method using different concentrations of chitosan and two Pluronic (poloxamer) copolymers, F 127 and F68. These nanoparticles were characterized in terms of size, polydispersity, and encapsulation efficiency. The microalgae Pseudokirchneriella subcapitata (bioindicator chloroficea) was used to evaluate to ecotoxicity of nanopesticide in comparation of commercial formulation. The nanopesticide obtained resulted in homogeneous and monodisperse particles, with the mean diameter obtained of 166.3 nm, polydispersity indices were lower than 0.4 and positive superficial charge (+25 mv).The encapsulation efficiency, measured by by liquid chromatography, it was 34%. The ecotoxicity results demonstrated that the nanopesticide was less toxic that commercial formulations, in the same concentrations.
650 $aPesticida
650 $aToxicologia
653 $aHBL
700 1 $aSOUZA, D. R. C. de
700 1 $aROSA, M. A.
700 1 $aDUARTE, R. C. R. M.
700 1 $aDONAIRE, P.
700 1 $aDURAN, N.
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Registro original: |
Embrapa Meio Ambiente (CNPMA) |
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Registro Completo
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
14/12/2016 |
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Data da última atualização: |
01/03/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
SAMPAIO, F. B.; KNUPP, A. M.; FERNANDES, E. P.; MARTIN-DIDONET, C. C. G.; FERREIRA, E. P. de B. |
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Afiliação: |
FERNANDA BUENO SAMPAIO, UFG; ADRIANO MOREIRA KNUPP, CNPAF; ELIANA PAULA FERNANDES, UFG; CLAUDIA CRISTINA GARCIA MARTIN-DIDONET, UNIVERSIDADE ESTADUAL DE GOIÁS, Anápolis-GO; ENDERSON PETRONIO DE BRITO FERREIRA, CNPAF. |
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Título: |
Morphophysiological characterization of rhizobia isolated from wild genotypes of the common bean. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Bioscience Journal, Uberlândia, v. 32, n. 6, p. 1502-1511, nov./dez. 2016. |
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Idioma: |
Inglês |
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Conteúdo: |
This study aimed to characterize, based on the morphology and on the use of carbon sources, rhizobial isolates obtained from nodules of wild common bean genotypes cultivated on soil samples from the states of Goiás, Minas Gerais and Paraná. Based on morphological and carbon source use, similarity matrixes were generated to perform clustering analysis based on the Jaccard index. A total of 523 isolates were obtained with the predominance of isolates that acidify the culture medium and showed fast growth. Isolates from the soils of Araucária and Prudentópolis produced a greater amount of mucus than those from Jussara, Nova Veneza, Uberlândia and Unaí soils. The rhizobia isolates obtained from soils of Goiás and Minas Gerais showed greater phenotypic diversity than those from the soils of Paraná. Analysis based on the use of different carbon sources revealed that rhizobia isolates obtained from soils of Goiás have higher metabolic diversity. Overall, the most part of isolates grouped with the reference strains, especially with the Rhizobium tropici and R. freirei strains used as inoculants for the common bean. |
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Palavras-Chave: |
Caracterização morfológica. |
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Thesagro: |
Feijão; Fixação de nitrogênio; Phaseolus vulgaris; Rhizobium. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/151800/1/CNPAF-2016-bj.pdf
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Marc: |
LEADER 01866naa a2200229 a 4500
001 2058668
005 2017-03-01
008 2016 bl uuuu u00u1 u #d
100 1 $aSAMPAIO, F. B.
245 $aMorphophysiological characterization of rhizobia isolated from wild genotypes of the common bean.$h[electronic resource]
260 $c2016
520 $aThis study aimed to characterize, based on the morphology and on the use of carbon sources, rhizobial isolates obtained from nodules of wild common bean genotypes cultivated on soil samples from the states of Goiás, Minas Gerais and Paraná. Based on morphological and carbon source use, similarity matrixes were generated to perform clustering analysis based on the Jaccard index. A total of 523 isolates were obtained with the predominance of isolates that acidify the culture medium and showed fast growth. Isolates from the soils of Araucária and Prudentópolis produced a greater amount of mucus than those from Jussara, Nova Veneza, Uberlândia and Unaí soils. The rhizobia isolates obtained from soils of Goiás and Minas Gerais showed greater phenotypic diversity than those from the soils of Paraná. Analysis based on the use of different carbon sources revealed that rhizobia isolates obtained from soils of Goiás have higher metabolic diversity. Overall, the most part of isolates grouped with the reference strains, especially with the Rhizobium tropici and R. freirei strains used as inoculants for the common bean.
650 $aFeijão
650 $aFixação de nitrogênio
650 $aPhaseolus vulgaris
650 $aRhizobium
653 $aCaracterização morfológica
700 1 $aKNUPP, A. M.
700 1 $aFERNANDES, E. P.
700 1 $aMARTIN-DIDONET, C. C. G.
700 1 $aFERREIRA, E. P. de B.
773 $tBioscience Journal, Uberlândia$gv. 32, n. 6, p. 1502-1511, nov./dez. 2016.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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