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dc.contributor.authorQUEIROZ, S. C. do N. dept_BR
dc.contributor.authorCANTRELL, C. L.pt_BR
dc.contributor.authorDUKE, S. O.pt_BR
dc.contributor.authorMORAES, R. M.pt_BR
dc.contributor.authorCERDEIRA, A. L.pt_BR
dc.contributor.authorNANDULA, V.pt_BR
dc.date.accessioned2013-04-23T11:11:11Zpt_BR
dc.date.available2013-04-23T11:11:11Zpt_BR
dc.date.created2013-04-23pt_BR
dc.date.issued2012pt_BR
dc.identifier.citationThieme eJournals - Abstract.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/956433pt_BR
dc.descriptionHorseweed [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 aspt_BR
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectPhytotoxic terpenoidspt_BR
dc.subjectHorseweedpt_BR
dc.titleBioassay-directed isolation and identification of phytotoxic terpenoids from horseweed (Conyza Canadensis).pt_BR
dc.typeResumo em anais e proceedingspt_BR
dc.date.updated2013-04-23T11:11:11Zpt_BR
dc.subject.nalthesaurusConyza canadensispt_BR
riaa.ainfo.id956433pt_BR
riaa.ainfo.lastupdate2013-04-23pt_BR
dc.contributor.institutionSONIA 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.pt_BR
Aparece nas coleções:Resumo em anais de congresso (CNPMA)

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