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| Registros recuperados : 232 | |
| 82. |  | ASSALIN, M. R.; QUEIROZ, S. C. do N. de; FERRACINI, V. L.; OLIVEIRA, T.; VILHENA, E.; MATTOS, M. L. T. A method for determination of imazapic and imazethapyr residues in soil using an ultrasonic assisted extraction and LC-MS/MS. Bulletin of Environmental Contamination and Toxicology, California, v. 93, n. 3, p. 362-364, 2014.| Biblioteca(s): Embrapa Clima Temperado; Embrapa Meio Ambiente. |
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| 91. | | QUEIROZ, S. C. do N. de; FERRACINI, V. L.; PEREIRA, A. S.; GOMES, M. A. F.; SANTOS, G. L. dos. Monitoramento de herbicidas em água subterrânea da microbacia do córrego do Espraiado, Ribeirão Preto, SP. In: GOMES, M. A. F. (Ed.). Uso agrícola das áreas de afloramento do Aqüífero Guarani no Brasil: implicações para a água subterrânea e propostas de gestão com enfoque agroambiental. Brasília, DF: Embrapa Informação Tecnológica; Jaguariúna: Embrapa Meio Ambiente, 2008. p.113-130.| Biblioteca(s): Embrapa Meio Ambiente. |
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| 96. | | MORAES, R. M.; CERDEIRA, A. L.; DUKE, S. O.; CANTRELL, C. L.; QUEIROZ, S. C. do N. de. Pesticidas naturais derivados de plantas: descoberta e usos. In: HALFELD-VIEIRA, B. A.; MARINHO-PRADO, J. S.; NECHET, K. de L.; MORANDI, M. A. B.; BETTIOL, W. (Ed.). Defensivos agrícolas naturais: uso e perspectivas. Brasília, DF: Embrapa, 2016. p. 505-541.| Biblioteca(s): Embrapa Meio Ambiente. |
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| Registros recuperados : 232 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
23/04/2013 |
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Data da última atualização: |
23/04/2013 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
QUEIROZ, S. C. do N. de; CANTRELL, C. L.; DUKE, S. O.; MORAES, R. M.; CERDEIRA, A. L.; NANDULA, V. |
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Afiliação: |
SONIA CLAUDIA DO N DE QUEIROZ, CNPMA; C. L. CANTRELL, USDA-ARS; S. O. DUKE, USDA-ARS; R. M. MORAES, University of Mississippi-USA; ANTONIO LUIZ CERDEIRA, CNPMA; V. NANDULA, USDA-ARS. |
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Título: |
Bioassay-directed isolation and identification of phytotoxic terpenoids from horseweed (Conyza Canadensis). |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Thieme eJournals - Abstract. |
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Idioma: |
Inglês |
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Conteúdo: |
Horseweed [Conyza canadensis (L.) Cronquist, syn. Erigeron canadensis L.], Asteraceae, is a common weed with known allelopathic effects but few studies on the isolation and identification of the phytotoxic compounds have been reported [1]. C. canadensis infests orchards, vineyards, field crops such as corn, soybean and cotton, particularly in herbicide-resistant crops where conservation tillage or no-till systems are used. The objective of this study was to identify the phytotoxic compounds present by systematically performing bioassay-directed isolation and subsequent identification of the bioactive constituents according to Dayan et al. [2]. No significant phytotoxic activity against Lactuca sativa or Agrostis stolonifera was detected in methanol, or water extracts when tested at 1.0mg·mL-1; however, the dichloromethane extract was active. Further fractionation using liquid-liquid partitioning with hexane, chloroform, ethyl acetate and water was performed with the DCM extract. The most active extract (chloroform) was subjected to preparative HPLC and the fractions were tested again. The active compounds were isolated and identified by GC-MS and 1H- and 13C-NMR. The isolated compounds (Figure 1) were identified as (2Z,8Z)-matricaria acid methyl ester, (4Z,8Z)-matricarialactone and (4Z)-lachnophyllumlactone. Compound 3 shows similar activity as |
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Palavras-Chave: |
Horseweed; Phytotoxic terpenoids. |
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Thesaurus NAL: |
Conyza canadensis. |
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Categoria do assunto: |
W Química e Física |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/81863/1/RA-QueirozSCN-PlantaMedica-....pdf
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Marc: |
LEADER 01992nam a2200205 a 4500
001 1956433
005 2013-04-23
008 2012 bl uuuu u00u1 u #d
100 1 $aQUEIROZ, S. C. do N. de
245 $aBioassay-directed isolation and identification of phytotoxic terpenoids from horseweed (Conyza Canadensis).$h[electronic resource]
260 $aThieme eJournals - Abstract.$c2012
520 $aHorseweed [Conyza canadensis (L.) Cronquist, syn. Erigeron canadensis L.], Asteraceae, is a common weed with known allelopathic effects but few studies on the isolation and identification of the phytotoxic compounds have been reported [1]. C. canadensis infests orchards, vineyards, field crops such as corn, soybean and cotton, particularly in herbicide-resistant crops where conservation tillage or no-till systems are used. The objective of this study was to identify the phytotoxic compounds present by systematically performing bioassay-directed isolation and subsequent identification of the bioactive constituents according to Dayan et al. [2]. No significant phytotoxic activity against Lactuca sativa or Agrostis stolonifera was detected in methanol, or water extracts when tested at 1.0mg·mL-1; however, the dichloromethane extract was active. Further fractionation using liquid-liquid partitioning with hexane, chloroform, ethyl acetate and water was performed with the DCM extract. The most active extract (chloroform) was subjected to preparative HPLC and the fractions were tested again. The active compounds were isolated and identified by GC-MS and 1H- and 13C-NMR. The isolated compounds (Figure 1) were identified as (2Z,8Z)-matricaria acid methyl ester, (4Z,8Z)-matricarialactone and (4Z)-lachnophyllumlactone. Compound 3 shows similar activity as
650 $aConyza canadensis
653 $aHorseweed
653 $aPhytotoxic terpenoids
700 1 $aCANTRELL, C. L.
700 1 $aDUKE, S. O.
700 1 $aMORAES, R. M.
700 1 $aCERDEIRA, A. L.
700 1 $aNANDULA, V.
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Embrapa Meio Ambiente (CNPMA) |
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