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Registro Completo |
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Biblioteca(s): |
Embrapa Agroenergia. |
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Data corrente: |
16/08/2022 |
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Data da última atualização: |
16/08/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BARBOSA, B. M.; VAZ JUNIOR, S.; COLODETTE, J. L.; AGUIAR, A. R. de; CABRAL, C. P. T.; FARIA, B. de F. H. de. |
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Afiliação: |
BIANCA MOREIRA BARBOSA, Universidade Federal de Viçosa; SILVIO VAZ JUNIOR, CNPAE; JORGE LUIZ COLODETTE, Universidade Federal de Viçosa; ALEX RAMOS DE AGUIAR, Universidade Federal de Viçosa; CARLA PRISCILA TÁVORA CABRAL, Universidade Federal do Amapá; BRUNO DE FREITAS HOMEM DE FARIA, Universidade Federal de Viçosa. |
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Título: |
Structural and chemical characterization of lignin and hemicellulose isolated from corn fibers toward agroindustrial residue valorization. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Cellulose, 2022. |
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DOI: |
https://doi.org/10.1007/s10570-022-04769-2 |
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Idioma: |
Inglês |
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Conteúdo: |
Corn fiber (CF) is an agroindustrial residue obtained from starch or corn syrup. Currently, there has been increasing research interest in lignocellulosic materials from these residual materials. Consequently, this paper is a novel approach that complements the structural and chemical characterizations already published in the literature for CF. In this study, isolation, chemical composition and characterization was conducted of hemicellulose by means of 1H NMR and FTIR-ATR and Klason lignin by means of acid soluble lignin (ASL) and acid insoluble lignin (AIL) determination using UV spectrophotometry and Py?GC‒MS. Hemicellulose was obtained after aqueous extraction, lipid removal, delignification and alkaline extraction. The isolated hemicellulose from CF confirmed the presence of arabinoxylan, which was similar to the results reported in the literature. The CF contained 8.0% and 4.0% ASL and AIL, respectively. Regarding lignin, the study identified more than 47 primary pyrolysis products for ASL, with 17%, 20% and 59% relative molar abundance for lignin, carbohydrates, and other products, respectively, and 39 primary pyrolysis products with 44% and 7% relative molar abundance for lignin and carbohydrates, respectively. The main products derived from lignin were phenol, 4-methylphenol, guaiacol, 4-vinilguaiacol, syringol and syringylaldehyde. The peaks of lignin derivatives indicated that the Klason method is effective for lignin isolation, and the Py? GC‒MS technique allowed for the identification of the presence of residual lignin in AIL and ASL from CF. In this context, lignocellulosic components of CF are chemically suitable for use as raw materials to transform biomass into high value-added products. MenosCorn fiber (CF) is an agroindustrial residue obtained from starch or corn syrup. Currently, there has been increasing research interest in lignocellulosic materials from these residual materials. Consequently, this paper is a novel approach that complements the structural and chemical characterizations already published in the literature for CF. In this study, isolation, chemical composition and characterization was conducted of hemicellulose by means of 1H NMR and FTIR-ATR and Klason lignin by means of acid soluble lignin (ASL) and acid insoluble lignin (AIL) determination using UV spectrophotometry and Py?GC‒MS. Hemicellulose was obtained after aqueous extraction, lipid removal, delignification and alkaline extraction. The isolated hemicellulose from CF confirmed the presence of arabinoxylan, which was similar to the results reported in the literature. The CF contained 8.0% and 4.0% ASL and AIL, respectively. Regarding lignin, the study identified more than 47 primary pyrolysis products for ASL, with 17%, 20% and 59% relative molar abundance for lignin, carbohydrates, and other products, respectively, and 39 primary pyrolysis products with 44% and 7% relative molar abundance for lignin and carbohydrates, respectively. The main products derived from lignin were phenol, 4-methylphenol, guaiacol, 4-vinilguaiacol, syringol and syringylaldehyde. The peaks of lignin derivatives indicated that the Klason method is effective for lignin isolation, and the Py? GC‒MS tech... Mostrar Tudo |
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Palavras-Chave: |
Agricultural residues; Bioproducts; Lignocellulosic biomass. |
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Thesaurus Nal: |
Green chemistry. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1145474/1/Silvio-Artigo-SEG-1.pdf
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Marc: |
LEADER 02518naa a2200241 a 4500
001 2145474
005 2022-08-16
008 2022 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s10570-022-04769-2$2DOI
100 1 $aBARBOSA, B. M.
245 $aStructural and chemical characterization of lignin and hemicellulose isolated from corn fibers toward agroindustrial residue valorization.$h[electronic resource]
260 $c2022
520 $aCorn fiber (CF) is an agroindustrial residue obtained from starch or corn syrup. Currently, there has been increasing research interest in lignocellulosic materials from these residual materials. Consequently, this paper is a novel approach that complements the structural and chemical characterizations already published in the literature for CF. In this study, isolation, chemical composition and characterization was conducted of hemicellulose by means of 1H NMR and FTIR-ATR and Klason lignin by means of acid soluble lignin (ASL) and acid insoluble lignin (AIL) determination using UV spectrophotometry and Py?GC‒MS. Hemicellulose was obtained after aqueous extraction, lipid removal, delignification and alkaline extraction. The isolated hemicellulose from CF confirmed the presence of arabinoxylan, which was similar to the results reported in the literature. The CF contained 8.0% and 4.0% ASL and AIL, respectively. Regarding lignin, the study identified more than 47 primary pyrolysis products for ASL, with 17%, 20% and 59% relative molar abundance for lignin, carbohydrates, and other products, respectively, and 39 primary pyrolysis products with 44% and 7% relative molar abundance for lignin and carbohydrates, respectively. The main products derived from lignin were phenol, 4-methylphenol, guaiacol, 4-vinilguaiacol, syringol and syringylaldehyde. The peaks of lignin derivatives indicated that the Klason method is effective for lignin isolation, and the Py? GC‒MS technique allowed for the identification of the presence of residual lignin in AIL and ASL from CF. In this context, lignocellulosic components of CF are chemically suitable for use as raw materials to transform biomass into high value-added products.
650 $aGreen chemistry
653 $aAgricultural residues
653 $aBioproducts
653 $aLignocellulosic biomass
700 1 $aVAZ JUNIOR, S.
700 1 $aCOLODETTE, J. L.
700 1 $aAGUIAR, A. R. de
700 1 $aCABRAL, C. P. T.
700 1 $aFARIA, B. de F. H. de
773 $tCellulose, 2022.
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Registro original: |
Embrapa Agroenergia (CNPAE) |
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Biblioteca |
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Origem |
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Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
04/07/2007 |
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Data da última atualização: |
20/10/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - A |
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Autoria: |
PARAIBA, L. C.; PULINO, P. |
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Afiliação: |
LOURIVAL COSTA PARAIBA, CNPMA; P. PULINO, IMECC-UNICAMP. |
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Título: |
Pesticide dispersion-advection equation with soil temperature effect. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
Environmetrics, Sussex, v. 14, n. 3, p.323-337, 2003. |
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Idioma: |
Inglês |
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Conteúdo: |
A dispersion-advection equation, denoted as a DAPESTE model, of one-dimensional evolution to simulate pesticide leaching in soil with a sinusoidal function to describe the daily average soil temperature at different depths is presented. In numerical simulation, the finite element method (FEM) will be used for space semi-discretization and the regressive Eüler method (REM) for time discretization. It will be used as an FEM for dispersion-advection problems in which the advective transport predominates over the dispersive one. Let us suppose that the pesticide diffusivities in the gaseous and aqueous soil phases depend on the soil temperature. In this way, the effective hydrodynamic dispersion coefficient of the dispersion-advection equation will depend on the soil temperature. The pesticide air-water partition coefficient of the Henry law, varying with temperature, will be determined by the Clausius-Clapeyron equation. The van´t Hoff equation will be used to determine the temperature dependence of the pesticide soil sorption coefficient. The Arrhenius equation will be used to estimate the effect of the soil temperature on the pesticide degradation rate. These temperature dependence relationships can help comprehend the pesticide behavior in the soil under different scenarios of the soil temperatures, especially in pesticide concentration leaching and its half-life in soil. |
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Thesagro: |
Dispersão; Lixiviação; Pesticida; Solo; Sorção; Temperatura. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/163811/1/Paraiba-Pesticide-6961.pdf
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Marc: |
LEADER 01949naa a2200205 a 4500
001 1015532
005 2017-10-20
008 2003 bl uuuu u00u1 u #d
100 1 $aPARAIBA, L. C.
245 $aPesticide dispersion-advection equation with soil temperature effect.$h[electronic resource]
260 $c2003
520 $aA dispersion-advection equation, denoted as a DAPESTE model, of one-dimensional evolution to simulate pesticide leaching in soil with a sinusoidal function to describe the daily average soil temperature at different depths is presented. In numerical simulation, the finite element method (FEM) will be used for space semi-discretization and the regressive Eüler method (REM) for time discretization. It will be used as an FEM for dispersion-advection problems in which the advective transport predominates over the dispersive one. Let us suppose that the pesticide diffusivities in the gaseous and aqueous soil phases depend on the soil temperature. In this way, the effective hydrodynamic dispersion coefficient of the dispersion-advection equation will depend on the soil temperature. The pesticide air-water partition coefficient of the Henry law, varying with temperature, will be determined by the Clausius-Clapeyron equation. The van´t Hoff equation will be used to determine the temperature dependence of the pesticide soil sorption coefficient. The Arrhenius equation will be used to estimate the effect of the soil temperature on the pesticide degradation rate. These temperature dependence relationships can help comprehend the pesticide behavior in the soil under different scenarios of the soil temperatures, especially in pesticide concentration leaching and its half-life in soil.
650 $aDispersão
650 $aLixiviação
650 $aPesticida
650 $aSolo
650 $aSorção
650 $aTemperatura
700 1 $aPULINO, P.
773 $tEnvironmetrics, Sussex$gv. 14, n. 3, p.323-337, 2003.
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Embrapa Meio Ambiente (CNPMA) |
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