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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pecuária Sudeste. Para informações adicionais entre em contato com cppse.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
18/08/2005 |
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Data da última atualização: |
13/03/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SANTOS, D. M.; PEDROSO, M. M.; COSTA, L. M.; NOGUEIRA, A. R. de A.; NÓBREJA J. A. |
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Afiliação: |
DANIELE M. SANTOS, Universidade Federal de Uberlândia; MARIELE M. PEDROSO, Universidade Federal de São Carlos; LETICIA M. COSTA, Universidade Federal de São Carlos; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; JOAQUIM A. NOBREGA, Universidade Federal de São Carlos. |
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Título: |
A new procedure for bovine milk digestion in a focused microwave oven: gradual sample addition to pre-heated acid. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Talanta, v. 65, n. 2, p. 505-510, jan. 2005. |
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DOI: |
https://doi.org/10.1016/j.talanta.2004.07.013 |
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Idioma: |
Inglês |
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Conteúdo: |
Milk samples can be efficiently digested using a focused microwave oven, however the conventional procedure of addition of concentrated acids to the liquid sample leads to digestates with elevated acidity and residual carbon concentrations. In this work a focused microwave oven was applied for acid digestion of bovine milk samples using a conventional and an alternative procedure based on gradual sample addition to hot and concentrated acids. A two-level 23 full factorial design experiment with eight runs was carried out to evaluate the optimum experimental conditions for reducing both the residual carbon and the final acidity of digestates. The three studied parameters were: temperature of the digestion medium for sample addition, addition of sulfuric acid before the sample or during the first step, and number of aliquots of the sample gradually added. The best conditions were attained by adding small aliquots of milk (ten-fold a volume of 0.5 ml added during 5.0 min) to a digestion mixture containing 3.0 ml nitric acid plus 1.0 ml sulfuric acid heated at 105 °C. It was demonstrated that the digestion efficiency of the alternative procedure was better than the conventional procedure, i.e. 98 and 80%, respectively. The alternative procedure was applied for determination of Ba, Ca, Cu, K, Mg, Na, P, and Zn in whole and non-fat bovine milk. The accuracy was proved using two certified reference materials (whole and non-fat milk powder). |
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Palavras-Chave: |
Bovine milk; Focused microwave assisted digestion; Pre heated acid; Sample addition. |
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Thesagro: |
GADO DE CORTE; GADO LEITEIRO. |
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Categoria do assunto: |
W Química e Física |
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Marc: |
LEADER 02264naa a2200253 a 4500
001 1047183
005 2023-03-13
008 2005 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.talanta.2004.07.013$2DOI
100 1 $aSANTOS, D. M.
245 $aA new procedure for bovine milk digestion in a focused microwave oven$bgradual sample addition to pre-heated acid.$h[electronic resource]
260 $c2005
520 $aMilk samples can be efficiently digested using a focused microwave oven, however the conventional procedure of addition of concentrated acids to the liquid sample leads to digestates with elevated acidity and residual carbon concentrations. In this work a focused microwave oven was applied for acid digestion of bovine milk samples using a conventional and an alternative procedure based on gradual sample addition to hot and concentrated acids. A two-level 23 full factorial design experiment with eight runs was carried out to evaluate the optimum experimental conditions for reducing both the residual carbon and the final acidity of digestates. The three studied parameters were: temperature of the digestion medium for sample addition, addition of sulfuric acid before the sample or during the first step, and number of aliquots of the sample gradually added. The best conditions were attained by adding small aliquots of milk (ten-fold a volume of 0.5 ml added during 5.0 min) to a digestion mixture containing 3.0 ml nitric acid plus 1.0 ml sulfuric acid heated at 105 °C. It was demonstrated that the digestion efficiency of the alternative procedure was better than the conventional procedure, i.e. 98 and 80%, respectively. The alternative procedure was applied for determination of Ba, Ca, Cu, K, Mg, Na, P, and Zn in whole and non-fat bovine milk. The accuracy was proved using two certified reference materials (whole and non-fat milk powder).
650 $aGADO DE CORTE
650 $aGADO LEITEIRO
653 $aBovine milk
653 $aFocused microwave assisted digestion
653 $aPre heated acid
653 $aSample addition
700 1 $aPEDROSO, M. M.
700 1 $aCOSTA, L. M.
700 1 $aNOGUEIRA, A. R. de A.
700 1 $aNÓBREJA J. A.
773 $tTalanta$gv. 65, n. 2, p. 505-510, jan. 2005.
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
29/11/2008 |
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Data da última atualização: |
29/11/2008 |
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Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
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Autoria: |
NUNES, R. de S.; SOUSA, D. M. G. de; GOEDERT, W. J.; SOARES, J. R. R. |
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Afiliação: |
Rafael de Souza Nunes, UnB; Djalma Martinhão Gomes de Sousa, CPAC; Wenceslau J. Goedert, UnB; João Ricardo Ramos Soares, UnB. |
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Título: |
Fracionamento da matéria orgânica de um solo sob sistema de preparo convencional e plantio direto. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
In: SIMPÓSIO NACIONAL CERRADO, 9.; SIMPÓSIO INTERNACIONAL SAVANAS TROPICAIS, 2., 2008, Brasília, DF. Desafios e estratégias para o equilíbrio entre sociedade, agronegócio e recursos naturais: anais... Planaltina, DF: Embrapa Cerrados, 2008. 1 CD-ROM. |
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Idioma: |
Português |
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Palavras-Chave: |
Plantio convencional. |
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Thesagro: |
Plantio Direto; Solo. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00753naa a2200181 a 4500
001 1571142
005 2008-11-29
008 2008 bl uuuu u00u1 u #d
100 1 $aNUNES, R. de S.
245 $aFracionamento da matéria orgânica de um solo sob sistema de preparo convencional e plantio direto.
260 $c2008
650 $aPlantio Direto
650 $aSolo
653 $aPlantio convencional
700 1 $aSOUSA, D. M. G. de
700 1 $aGOEDERT, W. J.
700 1 $aSOARES, J. R. R.
773 $tIn: SIMPÓSIO NACIONAL CERRADO, 9.; SIMPÓSIO INTERNACIONAL SAVANAS TROPICAIS, 2., 2008, Brasília, DF. Desafios e estratégias para o equilíbrio entre sociedade, agronegócio e recursos naturais: anais... Planaltina, DF: Embrapa Cerrados, 2008. 1 CD-ROM.
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