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Registro Completo |
Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
23/11/2017 |
Data da última atualização: |
04/01/2018 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
LAZZAROTTO, S. R. da S.; BET, C. D.; HORNUNG, P. S.; LAZZAROTTO, M.; SCHNITZLER, E. |
Afiliação: |
Simone Rosa da Silveira Lazzarotto, Doutoranda da UEPG; Camila Delinski Bet, UEPG; Polyanna Silveira Hornung, UFPR; MARCELO LAZZAROTTO, CNPF; Egon Schnitzler, UEPG. |
Título: |
Induced effects by oxidation with potassium permanganate on the thermal, morphological, colorimetric and pasting properties of corn starch. |
Ano de publicação: |
2017 |
Fonte/Imprenta: |
Ukrainian Food Journal, v. 6, n. 2, p. 197-210, 2017. |
DOI: |
10.24263/2304- 974X-2017-6-2-3 |
Idioma: |
Inglês |
Conteúdo: |
Introduction. Native starches are the most consumed polysaccharides in human diet. They are used in several industries as food, textile, pharmaceutic, etc. However due to some limitations starches should be modified chemically. Materials and methods. Corn starch modified with standard solutions of potassium permanganate (KMnO4) was analysed by simultaneous thermogravimetry-differential thermal analysis, differential scanning calorimetry, rapid viscoamylographic analysis, field emission gun-scanning electron microscopy/energy dispersive spectroscopy, X-ray powder diffraction and colorimetric analysis. Results and discussion. Corn starch was oxidised with KMnO4 at different concentrations (0.01; 0.02 and 0.05 mol L-1) at pH = 6.0 for 1 hour. (0.01; 0.02 and 0.05 mol L-1), pH = 6.0 for 1 hour. After filtered, washed and dried at 40 oC by 24 hours, the properties of the samples were investigated. Thermogravimetric curves showed an endothermic peak attributed to evaporation of water and two exothermic peaks, which refer to the decomposition and oxidation of organic matter until the formation of ash. A period of stability was observed, which decrease after modification. The gelatinisation of oxidised starch occurred at higher peak temperatures and also required higher gelatinisation enthalpy. The viscosity of the samples was significantly reduced and the relative crystallinity increased in proportion to the oxidant concentration used. Manganese and potassium content increased with the modification. There were no morphological changes after oxidation; however a darkening of the samples was identified due to the presence of potassium and manganese observed by energy dispersive spectroscopy (EDS). Conclusions. The obtained fluid paste with low retrogradation tendency suggests the application of oxidised starch in the paper industry. MenosIntroduction. Native starches are the most consumed polysaccharides in human diet. They are used in several industries as food, textile, pharmaceutic, etc. However due to some limitations starches should be modified chemically. Materials and methods. Corn starch modified with standard solutions of potassium permanganate (KMnO4) was analysed by simultaneous thermogravimetry-differential thermal analysis, differential scanning calorimetry, rapid viscoamylographic analysis, field emission gun-scanning electron microscopy/energy dispersive spectroscopy, X-ray powder diffraction and colorimetric analysis. Results and discussion. Corn starch was oxidised with KMnO4 at different concentrations (0.01; 0.02 and 0.05 mol L-1) at pH = 6.0 for 1 hour. (0.01; 0.02 and 0.05 mol L-1), pH = 6.0 for 1 hour. After filtered, washed and dried at 40 oC by 24 hours, the properties of the samples were investigated. Thermogravimetric curves showed an endothermic peak attributed to evaporation of water and two exothermic peaks, which refer to the decomposition and oxidation of organic matter until the formation of ash. A period of stability was observed, which decrease after modification. The gelatinisation of oxidised starch occurred at higher peak temperatures and also required higher gelatinisation enthalpy. The viscosity of the samples was significantly reduced and the relative crystallinity increased in proportion to the oxidant concentration used. Manganese and potassium content increased with... Mostrar Tudo |
Thesagro: |
Amido; Milho; Oxidação; Permanganato de potássio. |
Thesaurus Nal: |
Corn starch; Oxidation; Potassium permanganate. |
Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/167360/1/2017-MarceloL-UFJ-Induced.pdf
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Marc: |
LEADER 02682naa a2200265 a 4500 001 2080555 005 2018-01-04 008 2017 bl uuuu u00u1 u #d 024 7 $a10.24263/2304- 974X-2017-6-2-3$2DOI 100 1 $aLAZZAROTTO, S. R. da S. 245 $aInduced effects by oxidation with potassium permanganate on the thermal, morphological, colorimetric and pasting properties of corn starch.$h[electronic resource] 260 $c2017 520 $aIntroduction. Native starches are the most consumed polysaccharides in human diet. They are used in several industries as food, textile, pharmaceutic, etc. However due to some limitations starches should be modified chemically. Materials and methods. Corn starch modified with standard solutions of potassium permanganate (KMnO4) was analysed by simultaneous thermogravimetry-differential thermal analysis, differential scanning calorimetry, rapid viscoamylographic analysis, field emission gun-scanning electron microscopy/energy dispersive spectroscopy, X-ray powder diffraction and colorimetric analysis. Results and discussion. Corn starch was oxidised with KMnO4 at different concentrations (0.01; 0.02 and 0.05 mol L-1) at pH = 6.0 for 1 hour. (0.01; 0.02 and 0.05 mol L-1), pH = 6.0 for 1 hour. After filtered, washed and dried at 40 oC by 24 hours, the properties of the samples were investigated. Thermogravimetric curves showed an endothermic peak attributed to evaporation of water and two exothermic peaks, which refer to the decomposition and oxidation of organic matter until the formation of ash. A period of stability was observed, which decrease after modification. The gelatinisation of oxidised starch occurred at higher peak temperatures and also required higher gelatinisation enthalpy. The viscosity of the samples was significantly reduced and the relative crystallinity increased in proportion to the oxidant concentration used. Manganese and potassium content increased with the modification. There were no morphological changes after oxidation; however a darkening of the samples was identified due to the presence of potassium and manganese observed by energy dispersive spectroscopy (EDS). Conclusions. The obtained fluid paste with low retrogradation tendency suggests the application of oxidised starch in the paper industry. 650 $aCorn starch 650 $aOxidation 650 $aPotassium permanganate 650 $aAmido 650 $aMilho 650 $aOxidação 650 $aPermanganato de potássio 700 1 $aBET, C. D. 700 1 $aHORNUNG, P. S. 700 1 $aLAZZAROTTO, M. 700 1 $aSCHNITZLER, E. 773 $tUkrainian Food Journal$gv. 6, n. 2, p. 197-210, 2017.
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Registro original: |
Embrapa Florestas (CNPF) |
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Registro Completo
Biblioteca(s): |
Embrapa Tabuleiros Costeiros. |
Data corrente: |
27/02/1996 |
Data da última atualização: |
16/08/2013 |
Autoria: |
ARAGAO, W. M.; ALMEIDA, S. A.; SOBRAL, L. F. |
Afiliação: |
WILSON MENEZES ARAGAO; SILVIO ARAGAO ALMEIDA; LAFAYETTE FRANCO SOBRAL, CPATC. |
Título: |
Avaliação de espécies do gênero brachiaria em solo do tipo vermelho na região de Nossa Senhora do Socorro, Sergipe. |
Ano de publicação: |
1983 |
Fonte/Imprenta: |
Aracaju: EMBRAPA-UEPAE de Aracaju, 1983. |
Páginas: |
6 p. |
Série: |
(EMBRAPA-UEPAE Aracaju. Pesquisa em Andamento, 18). |
Idioma: |
Português |
Palavras-Chave: |
Avaliação; Brasil; Nossa Senhora do Socorro; Pastagens; Sergipe; Solo vermelho. |
Thesagro: |
Brachiaria; Solo. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/87917/1/CPATC-PESQ.-AND.-18-83.pdf
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Marc: |
LEADER 00715nam a2200241 a 4500 001 1964232 005 2013-08-16 008 1983 bl uuuu u0uu1 u #d 100 1 $aARAGAO, W. M. 245 $aAvaliação de espécies do gênero brachiaria em solo do tipo vermelho na região de Nossa Senhora do Socorro, Sergipe. 260 $aAracaju: EMBRAPA-UEPAE de Aracaju$c1983 300 $a6 p. 490 $a(EMBRAPA-UEPAE Aracaju. Pesquisa em Andamento, 18). 650 $aBrachiaria 650 $aSolo 653 $aAvaliação 653 $aBrasil 653 $aNossa Senhora do Socorro 653 $aPastagens 653 $aSergipe 653 $aSolo vermelho 700 1 $aALMEIDA, S. A. 700 1 $aSOBRAL, L. F.
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