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Registro Completo |
Biblioteca(s): |
Embrapa Amazônia Ocidental; Embrapa Florestas. |
Data corrente: |
08/04/2008 |
Data da última atualização: |
29/07/2019 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
TEIXEIRA, P. C.; GONÇALVES, J. L. M.; ARTHUR JUNIOR, J. C.; DEZORDI, C. |
Afiliação: |
PAULO CESAR TEIXEIRA, CPAA; José Leonardo Moraes Gonçalves, ESALQ; José Carlos Arthur Junior, ESALQ; Cleci Dezordi, CPAA bolsista do SET/CNPq. |
Título: |
Eucalyptus sp. seedling response to potassium fertilization and soil water. |
Ano de publicação: |
2008 |
Fonte/Imprenta: |
Ciência Florestal, Santa Maria, v. 18, n. 1, p. 47-63, jan./mar. 2008. |
DOI: |
http://dx.doi.org/10.5902/19805098510 |
Idioma: |
Inglês |
Conteúdo: |
Matéria seca e relações hídricas em mudas de Eucalyptus sp. em função da fertilização potássica e da umidade do solo: este trabalho teve como objetivo verificar a influência da adubação potássica e do potencial de água do solo na produção de matéria seca e nas relações hídricas de mudas de eucalipto, em casa de vegetação. The objective of this study was to verify the influence of potassium fertilization and soil water potential on the dry matter production and on water relations of eucalypt seedlings grown under greenhouse conditions. |
Palavras-Chave: |
Déficit hídrico; Eucalypt; Nutrição potássica; Potassium nutrition; Relação hídrica; Relações hídricas; Water deficit; Water relation. |
Thesagro: |
Eucalipto. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/199926/1/1980-5098-cflo-18-01-00047.pdf
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Marc: |
LEADER 01387naa a2200277 a 4500 001 1682687 005 2019-07-29 008 2008 bl uuuu u00u1 u #d 024 7 $ahttp://dx.doi.org/10.5902/19805098510$2DOI 100 1 $aTEIXEIRA, P. C. 245 $aEucalyptus sp. seedling response to potassium fertilization and soil water. 260 $c2008 520 $aMatéria seca e relações hídricas em mudas de Eucalyptus sp. em função da fertilização potássica e da umidade do solo: este trabalho teve como objetivo verificar a influência da adubação potássica e do potencial de água do solo na produção de matéria seca e nas relações hídricas de mudas de eucalipto, em casa de vegetação. The objective of this study was to verify the influence of potassium fertilization and soil water potential on the dry matter production and on water relations of eucalypt seedlings grown under greenhouse conditions. 650 $aEucalipto 653 $aDéficit hídrico 653 $aEucalypt 653 $aNutrição potássica 653 $aPotassium nutrition 653 $aRelação hídrica 653 $aRelações hídricas 653 $aWater deficit 653 $aWater relation 700 1 $aGONÇALVES, J. L. M. 700 1 $aARTHUR JUNIOR, J. C. 700 1 $aDEZORDI, C. 773 $tCiência Florestal, Santa Maria$gv. 18, n. 1, p. 47-63, jan./mar. 2008.
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Registro original: |
Embrapa Amazônia Ocidental (CPAA) |
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Registro Completo
Biblioteca(s): |
Embrapa Meio Ambiente. |
Data corrente: |
04/04/2017 |
Data da última atualização: |
29/06/2017 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
PETRARCA, M. H.; ROSA, M. A.; QUEIROZ, S. C. do N. de; GODOY, H. T. |
Afiliação: |
M. H. PETRARCA, FEA/Unicamp; MARIA APARECIDA ROSA, CNPMA; SONIA CLAUDIA DO N DE QUEIROZ, CNPMA; H. T. GODOY. |
Título: |
Development, uncertainty estimation and application of a LC-MS/MS method for simultaneous determination of acrylamide and 4hydroxy2,5-dimethyl-3(2H)-furanone in baby food. |
Ano de publicação: |
2016 |
Fonte/Imprenta: |
In: IBERO-AMERICAN, 1.; BrMASS CONFERENCE ON MASS SPECTROMETRY, 6., 2016, Rio de Janeiro. Resumos Eletrônicos... São Paulo: Sociedade Brasileira de Espectrometria de Massas, 2016. |
Idioma: |
Inglês |
Conteúdo: |
Acrylamide, a heatgenerated food contaminant, has been associated with neurotoxic effects in humans and was classified under group 2A as a probable human carcinogen by the International Agency Research on Cancer (IARC) [1]. Additionally, hydroxy2,5dimethyl3(2H)furanone (DMHF), a furanic compound, has demonstrated genotoxic effects in vitro as also in vivo [2]. In this study, a new accurate liquid chromatographytandem mass spectrometry method was developed for simultaneous analysis of acrylamide and DMHF in baby food. To the best of our knowledge, this is the first study on DMHF in baby foods as well as pioneer in acrylamide monitoring in baby foods from Brazil. For this, a sample preparation method was optimized, which involves acetonitrile-based extraction, followed by dispersive solidphase extraction (dSPE) using primary and secondary amine sorbent (PSA) and then, a final cleanup of extract by solid phase extraction (SPE). An ACQUITY ultraperformance liquid chromatography (UPLC) system interfaced to a Quattro Premier XE triple quadrupole mass spectrometer with electrospray ionization (ESI) source (WATERS) was employed for analysis. The chromatographic separation was achieved on a C8 column (150 mm x 2.1 mm i.d., 5?m particle size) at 30ºC with a flow rate of 0.2 ml/min, and the injection volume was 20 ?l. The mobile phases consisted of MilliQ water (A) and acetonitrile (B), both containing 0.01% of formic acid, and the elution gradient employed was as follows: 0 min, 5% B? 5 min, 50% B? 5.1 min, 100% B? 6?10 min 5% B, resulting in a total run time of 10 min. Data acquisition was carried out in selective reaction monitoring (SRM) mode employing ESI in positive mode, whose conditions were: capillary voltage 3 KV? temperatures of source at 120°C and desolvation at 400°C and gas flow 500 L/h. The collision energy and cone voltage were 10 and 25 V. The m/z 55 and 44 (acrylamide) and m/z 101 and 83 (DMHF) were used respectively for quantitative and confirmative purposes. As a great result, the optimized sample preparation method provided sufficient removal of potential analytical interfering commonly present in fruitbased matrices, the amino acid valine, without affecting the sensitivity, trueness and precision of the method. Limits of detection (LOD) and quantification (LOQ) of 10 and 20 ?g/kg were obtained for both analytes. Linearity in solventonly and matrixmatched calibration curves was achieved in the range between 10 and 300 ?g/kg, with determination coefficients higher than 0.99. Matrix effects, calculated from slopes obtained for solvent and matrixmatched calibrations, were observed for acrylamide (?45%) and DMHF(?11%). Recoveries between 75 and 115% were obtained for the two studied compounds from blank baby foods spiked at 20 (LOQ), 100 and 200 ?g/kg. Precision, under repeatability and withinlaboratory reproducibility conditions, was verified with RSD values < 20%. In addition, by using data obtained from inhouse validation, was possible to estimate the expanded measurement uncertainty for the levels of acrylamide and DMHF detected in the samples, whose values were lower than 25%. The applicability of proposed analytical method was evaluated by analyzing 20 baby food samples available in Brazilian markets. MenosAcrylamide, a heatgenerated food contaminant, has been associated with neurotoxic effects in humans and was classified under group 2A as a probable human carcinogen by the International Agency Research on Cancer (IARC) [1]. Additionally, hydroxy2,5dimethyl3(2H)furanone (DMHF), a furanic compound, has demonstrated genotoxic effects in vitro as also in vivo [2]. In this study, a new accurate liquid chromatographytandem mass spectrometry method was developed for simultaneous analysis of acrylamide and DMHF in baby food. To the best of our knowledge, this is the first study on DMHF in baby foods as well as pioneer in acrylamide monitoring in baby foods from Brazil. For this, a sample preparation method was optimized, which involves acetonitrile-based extraction, followed by dispersive solidphase extraction (dSPE) using primary and secondary amine sorbent (PSA) and then, a final cleanup of extract by solid phase extraction (SPE). An ACQUITY ultraperformance liquid chromatography (UPLC) system interfaced to a Quattro Premier XE triple quadrupole mass spectrometer with electrospray ionization (ESI) source (WATERS) was employed for analysis. The chromatographic separation was achieved on a C8 column (150 mm x 2.1 mm i.d., 5?m particle size) at 30ºC with a flow rate of 0.2 ml/min, and the injection volume was 20 ?l. The mobile phases consisted of MilliQ water (A) and acetonitrile (B), both containing 0.01% of formic acid, and the elution gradient employed was as follows: 0 min, 5% B?... Mostrar Tudo |
Palavras-Chave: |
Acrylamide metabolite; Baby Food; Contaminante; Food contaminant; Food contaminants; LCMS/MS. |
Thesagro: |
Poluente. |
Thesaurus NAL: |
Acrylamides; Infant foods. |
Categoria do assunto: |
W Química e Física |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/161184/1/2016RA-027.pdf
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Marc: |
LEADER 04219nam a2200253 a 4500 001 2068083 005 2017-06-29 008 2016 bl uuuu u00u1 u #d 100 1 $aPETRARCA, M. H. 245 $aDevelopment, uncertainty estimation and application of a LC-MS/MS method for simultaneous determination of acrylamide and 4hydroxy2,5-dimethyl-3(2H)-furanone in baby food.$h[electronic resource] 260 $aIn: IBERO-AMERICAN, 1.; BrMASS CONFERENCE ON MASS SPECTROMETRY, 6., 2016, Rio de Janeiro. Resumos Eletrônicos... São Paulo: Sociedade Brasileira de Espectrometria de Massas$c2016 520 $aAcrylamide, a heatgenerated food contaminant, has been associated with neurotoxic effects in humans and was classified under group 2A as a probable human carcinogen by the International Agency Research on Cancer (IARC) [1]. Additionally, hydroxy2,5dimethyl3(2H)furanone (DMHF), a furanic compound, has demonstrated genotoxic effects in vitro as also in vivo [2]. In this study, a new accurate liquid chromatographytandem mass spectrometry method was developed for simultaneous analysis of acrylamide and DMHF in baby food. To the best of our knowledge, this is the first study on DMHF in baby foods as well as pioneer in acrylamide monitoring in baby foods from Brazil. For this, a sample preparation method was optimized, which involves acetonitrile-based extraction, followed by dispersive solidphase extraction (dSPE) using primary and secondary amine sorbent (PSA) and then, a final cleanup of extract by solid phase extraction (SPE). An ACQUITY ultraperformance liquid chromatography (UPLC) system interfaced to a Quattro Premier XE triple quadrupole mass spectrometer with electrospray ionization (ESI) source (WATERS) was employed for analysis. The chromatographic separation was achieved on a C8 column (150 mm x 2.1 mm i.d., 5?m particle size) at 30ºC with a flow rate of 0.2 ml/min, and the injection volume was 20 ?l. The mobile phases consisted of MilliQ water (A) and acetonitrile (B), both containing 0.01% of formic acid, and the elution gradient employed was as follows: 0 min, 5% B? 5 min, 50% B? 5.1 min, 100% B? 6?10 min 5% B, resulting in a total run time of 10 min. Data acquisition was carried out in selective reaction monitoring (SRM) mode employing ESI in positive mode, whose conditions were: capillary voltage 3 KV? temperatures of source at 120°C and desolvation at 400°C and gas flow 500 L/h. The collision energy and cone voltage were 10 and 25 V. The m/z 55 and 44 (acrylamide) and m/z 101 and 83 (DMHF) were used respectively for quantitative and confirmative purposes. As a great result, the optimized sample preparation method provided sufficient removal of potential analytical interfering commonly present in fruitbased matrices, the amino acid valine, without affecting the sensitivity, trueness and precision of the method. Limits of detection (LOD) and quantification (LOQ) of 10 and 20 ?g/kg were obtained for both analytes. Linearity in solventonly and matrixmatched calibration curves was achieved in the range between 10 and 300 ?g/kg, with determination coefficients higher than 0.99. Matrix effects, calculated from slopes obtained for solvent and matrixmatched calibrations, were observed for acrylamide (?45%) and DMHF(?11%). Recoveries between 75 and 115% were obtained for the two studied compounds from blank baby foods spiked at 20 (LOQ), 100 and 200 ?g/kg. Precision, under repeatability and withinlaboratory reproducibility conditions, was verified with RSD values < 20%. In addition, by using data obtained from inhouse validation, was possible to estimate the expanded measurement uncertainty for the levels of acrylamide and DMHF detected in the samples, whose values were lower than 25%. The applicability of proposed analytical method was evaluated by analyzing 20 baby food samples available in Brazilian markets. 650 $aAcrylamides 650 $aInfant foods 650 $aPoluente 653 $aAcrylamide metabolite 653 $aBaby Food 653 $aContaminante 653 $aFood contaminant 653 $aFood contaminants 653 $aLCMS/MS 700 1 $aROSA, M. A. 700 1 $aQUEIROZ, S. C. do N. de 700 1 $aGODOY, H. T.
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