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| 161. |  | MATOS, W. O.; CHAVES, F. S.; SOUZA, G. B. de; MARTIN, F. C. N.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. Especiação redox de cromo em amostras de cimento e solo. In: ENCONTRO NACIONAL DE QUÍMICA ANALÍTICA, 13.; CONGRESSO ÍBERO - AMERICANO DE QUÍMICA ANALÍTICA, 2005, Niterói, RJ. Anais... Niterói: BENQ, 2005. 1 CD-ROM| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 162. | | PESSOA, A. G. G.; AMARAL, C. D. do; SANTOS, M. C. dos; DONATI, G. L.; NÓBREGA, J. A.; NOGUEIRA, A. R. de A. Emprego de extração assistida por radiação micro-ondas e padrão de interferência para especiação de arsênio por HPLC-ICP-MS. In: ENCONTRO NACIONAL DE QUÍMICA ANALÍTICA, 16., 2011, Campos de Jordão. Anais... Campos de Jordão: SBQ, 2011.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 168. | | MORAES, D. P. de; BIZZI, C. A.; NÓBREGA, J. A.; FLORES, E. M. de M.; NOGUEIRA, A. R. de A.; BARIN, J. S.; MESKO, M. F. Preparo de amostras assistido por radiação micro-ondas. In: KRUG, F. J.; ROCHA, F. R. P. Métodos de preparo de amostras para análise elementar. 2 ed. São Paulo: EditSBQ, 2019. p.299-369.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| Registros recuperados : 171 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
26/06/2009 |
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Data da última atualização: |
15/03/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
GONZALEZ, M. H.; SOUZA, G. B. D.; OLIVEIRA, R. V. DE; FORATO, L. A.; NÓBREGA, J. A.; NOGUEIRA, A. R. de A. |
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Afiliação: |
MÁRIO HENRIQUE GONZALEZ, UFSCAR; GILBERTO BATISTA DE SOUZA, CPPSE; REGINA V. DE OLIVEIRA, UFSCAR; LUCIMARA A. FORATO, UFSCAR; JOAQUIM A. NÓBREGA, UFSCAR; ANA RITA DE ARAUJO NOGUEIRA, CPPSE. |
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Título: |
Microwave-assisted digestion procedures for biological samples with diluted nitric acid: identification of reaction products. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Talanta, v. 79, n. 2, p. 396-401, jul. 2009. |
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DOI: |
10.1016/j.talanta.2009.04.001 |
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Idioma: |
Inglês |
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Conteúdo: |
Microwave-assisted sample preparation using diluted nitric acid solutions is an alternative procedure for digesting organic samples. The efficiency of this procedure depends on the chemical properties of the samples and in this work it was evaluated by the determination of crude protein amount, fat and original carbon. Soybeans grains, bovine blood, bovine muscle and bovine viscera were digested in a cavity-microwave oven using oxidant mixtures in different acid concentrations. The digestion efficiency was evaluated based on the determination of residual carbon content and element recoveries using inductively coupled plasma optical emission spectrometry (ICP OES). In order to determine the main residual organic compounds, the digests were characterized by nuclear magnetic resonance ((1)H NMR). Subsequently, studies concerning separation of nitrobenzoic acid isomers were performed by ion pair reversed phase liquid chromatography using a C18 stationary phase, water:acetonitrile:methanol (75:20:5, v/v/v)+0.05% (v/v) TFA as mobile phase and ultraviolet detection at 254 nm. Sample preparation based on diluted acids proved to be feasible and a recommendable alternative for organic sample digestion, reducing both the reagent volumes and the variability of the residues as a result of the process of decomposition. It was shown that biological matrices containing amino acids, proteins and lipids in their composition produced nitrobenzoic acid isomers and other organic compounds after cleavage of chemical bonds. MenosMicrowave-assisted sample preparation using diluted nitric acid solutions is an alternative procedure for digesting organic samples. The efficiency of this procedure depends on the chemical properties of the samples and in this work it was evaluated by the determination of crude protein amount, fat and original carbon. Soybeans grains, bovine blood, bovine muscle and bovine viscera were digested in a cavity-microwave oven using oxidant mixtures in different acid concentrations. The digestion efficiency was evaluated based on the determination of residual carbon content and element recoveries using inductively coupled plasma optical emission spectrometry (ICP OES). In order to determine the main residual organic compounds, the digests were characterized by nuclear magnetic resonance ((1)H NMR). Subsequently, studies concerning separation of nitrobenzoic acid isomers were performed by ion pair reversed phase liquid chromatography using a C18 stationary phase, water:acetonitrile:methanol (75:20:5, v/v/v)+0.05% (v/v) TFA as mobile phase and ultraviolet detection at 254 nm. Sample preparation based on diluted acids proved to be feasible and a recommendable alternative for organic sample digestion, reducing both the reagent volumes and the variability of the residues as a result of the process of decomposition. It was shown that biological matrices containing amino acids, proteins and lipids in their composition produced nitrobenzoic acid isomers and other organic compounds after ... Mostrar Tudo |
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Palavras-Chave: |
Biological samples; Diluted nitric acid; Nitrobenzoic acid isomers; Sample preparation. |
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Thesaurus NAL: |
high performance liquid chromatography. |
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Categoria do assunto: |
W Química e Física |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/38657/1/PROCI-2009.00018.pdf
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Marc: |
LEADER 02365naa a2200253 a 4500
001 1082784
005 2023-03-15
008 2009 bl uuuu u00u1 u #d
024 7 $a10.1016/j.talanta.2009.04.001$2DOI
100 1 $aGONZALEZ, M. H.
245 $aMicrowave-assisted digestion procedures for biological samples with diluted nitric acid$bidentification of reaction products.$h[electronic resource]
260 $c2009
520 $aMicrowave-assisted sample preparation using diluted nitric acid solutions is an alternative procedure for digesting organic samples. The efficiency of this procedure depends on the chemical properties of the samples and in this work it was evaluated by the determination of crude protein amount, fat and original carbon. Soybeans grains, bovine blood, bovine muscle and bovine viscera were digested in a cavity-microwave oven using oxidant mixtures in different acid concentrations. The digestion efficiency was evaluated based on the determination of residual carbon content and element recoveries using inductively coupled plasma optical emission spectrometry (ICP OES). In order to determine the main residual organic compounds, the digests were characterized by nuclear magnetic resonance ((1)H NMR). Subsequently, studies concerning separation of nitrobenzoic acid isomers were performed by ion pair reversed phase liquid chromatography using a C18 stationary phase, water:acetonitrile:methanol (75:20:5, v/v/v)+0.05% (v/v) TFA as mobile phase and ultraviolet detection at 254 nm. Sample preparation based on diluted acids proved to be feasible and a recommendable alternative for organic sample digestion, reducing both the reagent volumes and the variability of the residues as a result of the process of decomposition. It was shown that biological matrices containing amino acids, proteins and lipids in their composition produced nitrobenzoic acid isomers and other organic compounds after cleavage of chemical bonds.
650 $ahigh performance liquid chromatography
653 $aBiological samples
653 $aDiluted nitric acid
653 $aNitrobenzoic acid isomers
653 $aSample preparation
700 1 $aSOUZA, G. B. D.
700 1 $aOLIVEIRA, R. V. DE
700 1 $aFORATO, L. A.
700 1 $aNÓBREGA, J. A.
700 1 $aNOGUEIRA, A. R. de A.
773 $tTalanta$gv. 79, n. 2, p. 396-401, jul. 2009.
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