Extração da lignina e emprego da mesma em curvas de calibração para a mensuração da lignina em produtos vegetais

Fukushima, Romualdo Shigueo; Garippo, Geraldo; Habitante, Ana Mônica Quinta Barbosa; Lacerda, Roseli Sengling

doi:10.1590/s1516-35982000000500007

Cited by 11 publications

(12 citation statements)

References 17 publications

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“…Resultados semelhantes foram também registrados por Fukushima et al (2000) ao extraírem a lignina brometo de acetila (LBrAc) da parede celular de plantas forrageiras em diferentes estágios de maturidade, obtendo um rendimento variando entre 1,1 a 25,6%.…”

Section: Resultadoss E Discussõesunclassified

Study of adsorption of lead II in lignin modified from corn waste

Schafhauser

Gonçalves²,

Consolin³

et al. 2015

REBRAPA

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Resumo: A utilização de metais pesados, principalmente no setor industrial, tem chamado a atenção quanto aos impactos gerados pela utilização de metais potencialmente tóxicos ao meio ambiente e saúde pública. A adsorção é um processo no qual uma substância (adsorvato) é aderida físicamente ou quimicamente à superfície do componente adsorvente e pode ser visto como uma alternativa para a remoção de metais tóxicos. Este trabalho tem o intuito de realizar um estudo sobre a adsorção de Chumbo II (Pb II) em um polímero natural modificado (lignina) obtido a partir do resíduo do milho (palha). Para a extração da lignina a partir de materiais lignocelulósicos, esta foi então isolada da palha do milho por meio da polpação com ácido fórmico (CH2O2) a 80,0% de concentração, obtendo a lignina fórmica (LFOR), que em seguida foi reticulada com ácido clorídrico (HCl) a 37,0%, dando origem ao polímero adsorvente utilizado neste estudo, a lignina fórmica reticulada (LFRT). Foram feitos testes adsortivos com diferentes tempos de contato entre adsorvente e a solução de Chumbo II com concentração de 10,0 mgL -1 , sendo a concentração final da solução medida por espectrofotometria de absorção atômica (EAA). Os resultados obtidos com a adsorção atômica mostraram que o polímero adsorvente apresentou uma capacidade adsortiva para a retenção de íons Pb +2 , removendo após 100 minutos 98,87% de Chumbo II da solução inicial. Sendo assim, o polímero LFRT pode vir a ser utilizado como um possível meio para remover metais pesados de efluentes agroindustriais.Palavras-chave: Adsorção; Metais Pesados; Chumbo II; Polímeros; Lignina Reticulada. Study of adsorption of lead II in lignin modified from corn waste:The use of heavy metals, especially in the industrial sector, has attracted attention for the impacts generated by the use of potentially toxic metals to the environment and public health. Adsorption is a process in which a substance (adsorbate) is physically or chemically attached to the surface of the adsorbent component and currently this process can be seen as an alternative to remove toxic metals from waste of agro-industrial sectors. This article aims to conduct a study about the adsorption of lead II (Pb II) on a modified natural polymer (lignin) obtained from corn stover. For the extraction of the lignin from lignocellulosic material, it was isolated by pulping with formic acid (CH2O2) at 80% concentration, obtaining lignin formica (LFOR). LFOR already been crosslinked with hydrochloric acid (HCl) 37.0% to give the polymer adsorbent used in this study crosslinked lignin formica (LFRT). Adsorption tests were performed with different times of contact between adsorbent and the solution of 10.0 mgL -1 lead II, and the final concentration of the solution was measured by atomic absorption spectrophotometry (AAS). The results which was obtained with atomic adsorption proved the adsorbent polymer show a capability to retain ions of lead II, removing after 100 minutes 98.87% of the heavy metal in the initial solution. Therefore, the polymer ...

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Section: Resultadoss E Discussõesunclassified

Study of adsorption of lead II in lignin modified from corn waste

Schafhauser

Gonçalves²,

Consolin³

et al. 2015

REBRAPA

View full text Add to dashboard Cite

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“…These values were higher than those analyzed in the greenhouse, and one hypothesis suggested it is due to the fact that the analyses were carried out at different stages of maturity of the crop, as observed by other authors (Fukushima et al, 2000).…”

Section: Resultsmentioning

confidence: 59%

Maize Stover Degradation Under the Influence of Haloxyfop-Methyl Underdoses

et al. 2016

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-One of the major constraints to sustainable tillage is the rapid decomposition of the dry matter. The mechanism known to facilitate this process is the interference in the metabolic pathways of lignin polymers from spraying herbicide underdoses. This study has aimed to verify the effect of underdoses of haloxyfop-methyl in the synthesis of lignin and correlate the interference of this phenolic compound in the decomposition of maize stover. Two preliminary experiments were carried out in a greenhouse to set up the best underdoses to be applied in the yield area experiment. The treatments in the first experiment consisted of: 0; 2.5; 5 and 10 g a.i. ha of haloxyfop-methyl increased in 13% the lignin content without interfering in height and biomass of the plants, contributing to delay the decomposition rate in 4% in the residual stover.Keywords: Zea mays, herbicide, levels of lignin, growth stimulus. de haloxyfop-methyl, acrescidas de 0,5% (v:v) RESUMO -Uma das maiores limitações para sustentabilidade do plantio direto é a rápida decomposição da matéria seca. O mecanismo conhecido para viabilizar esse processo é a interferência nas vias metabólicas dos polímeros de lignina a partir da aplicação de subdoses de herbicida. Este trabalho teve por objetivos verificar o efeito de subdoses do haloxyfop-methyl na síntese da lignina e correlacionar a interferência desse composto fenólico na decomposição da palhada do milho. Dois experimentos preliminares em casa de vegetação foram conduzidos para ajuste das melhores subdoses a serem aplicadas no experimento em área de produção. Os tratamentos, no primeiro experimento, constituíram-se da aplicação do herbicida haloxyfop-methyl nas subdoses

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“…ha These values were higher than those analyzed in the greenhouse. One hypothesis to explain these different results may be in the different plants stages at the time of collection of plant material for the analyses, a fact also confirmed by Fukushima et al (2000). This demonstrates that apparently a temporary effect on the change of plant lignin contents occurs, but these changes do not persist until the final stages of the cycle, which does not contribute to significant changes in the composition of maize stover.…”

Section: Nsmentioning

confidence: 63%

Management of Maize Stover With Underdoses Rates of Glyphosate Applications in No-Tillage

et al. 2015

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-Glyphosate has significant effects on the growth and development of plants when in underdoses. This work was developed to verify the effect of the application of glyphosate in underdoses in lignin synthesis and consequently decomposition of maize stover. Two experiments were conducted; the first one in a greenhouse for underdoses adjustments and the second one in the production area. The experimental design of the first trial was completely randomized with four replications. The treatments consisted in the application of the underdoses: 0, 25, 50 and 100 g ha -1 of glyphosate. In the production area, the experimental design was a randomized block with four replications, in underdoses: 0, 12.5, 25 and 50 g ha -1. The results were submitted to analysis of variance and regression. The underdoses of 25 g a.e. ha -1 in a greenhouse promoted 36% increase in productivity of stover, in addition to increasing the lignin content in 16%, with no change in the unwanted growth of maize plants. In the production area, the concentration of 12.5 g a.e. ha

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Extração da lignina e emprego da mesma em curvas de calibração para a mensuração da lignina em produtos vegetais

Cited by 11 publications

References 17 publications

Study of adsorption of lead II in lignin modified from corn waste

Study of adsorption of lead II in lignin modified from corn waste

Maize Stover Degradation Under the Influence of Haloxyfop-Methyl Underdoses

Management of Maize Stover With Underdoses Rates of Glyphosate Applications in No-Tillage

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