Caracterização química e estrutural de fibra de sisal da variedade Agave sisalana

Martin, Adriana Regina; Martins, Maria Alice; Mattoso, L. H. C.; Silva, Odilon R. R. F.

doi:10.1590/s0104-14282009000100011

Cited by 78 publications

(63 citation statements)

References 44 publications

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“…Thus, the second event showed range of 251-363 °C for coconut fiber and between 267-393 °C for sisal fibers, with a mass loss of 51.5% and 55.5%, respectively. Probably, these intervals are related to the decomposition of cellulose and hemicellulose of natural fibers that are between 200-370 °C 44,59 .…”

Section: Tga Of the Fibers And Matrix Of Phbmentioning

confidence: 99%

Polyhydroxybutyrate Composites with Random Mats of Sisal and Coconut Fibers

et al. 2016

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Biodegradable polymeric composites using natural fibers have been investigated aiming to mitigate environmental impacts. In this paper, polyhydroxybutyrate (PHB) composites obtained using random mats of sisal and coconut fibers by compression molding in a hydraulic press, and the fiber content varied between 10% and 15% relative to the weight of the polymer. Thermal analyses were performed such as Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). Flexural and tensile tests were performed before and after conditioning in climate chamber with temperature and moisture. The results of thermal analysis show that the thermal stability of the materials remained, both PHB without fiber as for composites with natural fibers mats. The results of mechanical tests indicated that the PHB without fibers and composites showed similar flexural strength values, while the results of the tensile test PHB without fibers showed resistance to higher tensile composite.

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Section: Tga Of the Fibers And Matrix Of Phbmentioning

confidence: 99%

Polyhydroxybutyrate Composites with Random Mats of Sisal and Coconut Fibers

et al. 2016

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“…Agave sisalana is a plant belonging to the family Agavaceae, and it is popularly known in Brazil as sisal (Martin et al, 2009). The fibre is the main product of A. sisalana culture; it is used in the automotive industry and in the manufacture of ropes, twines, sea cables, carpets, bags, brooms, upholstery and crafts (Silva and Beltrão, 1999;Martin et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…The fibre-loosening process generates about 95% waste, which corresponds to the watery part of the plant and the bagasse (Pizarro et al, 1999). When not disposed of, the fibre is used as animal feed, biofertilisers and in the production of drugs, particularly hormones (Martin et al, 2009;Ribeiro et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Preliminary phytochemical analysis and the effect of Agave sisalana on body weight and defensive behaviours in ovariectomized rats

Andrade¹,

Silva²,

Espinoza³

et al. 2017

J. Med. Plants Res.

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Agave sisalana is a plant belonging to the Agavaceae family. Sisal juice is constituted of steroidic saponins which are precursor molecules of many pharmacologically active steroids. These precursor molecules can act in brain structures that are related to the modulation of emotional disorders. They can act on energy metabolism or directly on the absorptive process of fats. The objective of this research was to identify the biocompounds present in A. sisalana juice, and to evaluate the effect of different extracts on the expression of defensive behaviours of rats in elevated plus maze and open field tests, and body weight, in a condition that corresponds to an induced menopause. Wistar rats were subjected to bilateral ovariectomy or to a sham surgical procedure under anaesthesia. Following surgery, they were treated gavage with sisal juice -concentrated crude juice (CCJ): 500 or 1000 mg/kg; dried extract (DE): 50, 100 or 200 mg/kg; dry mucilage extract (DME): 25, 50 or 100 mg/kg; and intermediate product (IP): 25, 50 or 100 mg/kg; or distilled water. The results showed the presence of coumarins, flavonoids, condensed tannins, free anthraquinones, alkaloids and saponins in the sisal juice. Both CCJ and DE (100 mg/kg) caused weight loss without alteration of defensive behaviours related to the manifestation of anxiety. As saponins were identified in DE in significant amounts, the observed effects were attributed to this component. Such findings point to A. sisalana as a plant that could potentially be used to treat weight gain during menopause.

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“…A utilização da fibra do sisal como matéria para a produção via ação microbiológica de compostos bioativos se mostra viável tendo como base a proporção dos polímeros orgânicos que a compõem, sendo as mesmas aproximadamente: 78% celulose, 10% hemicelulose e 9% de lignina e 2% de cinzas (MARTIN, et al, 2009). …”

Section: Introductionunclassified

Avaliação Do Potencial Da Fibra Do Sisal Como Substrato Em Bioprocessos

Costa¹,

Santos²,

Silva³

et al. 2017

Blucher Chemical Engineering Proceedings

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RESUMO -Tendo em vista a grande relevância que os produtos de origem microbiológica vêm tomando nas ultimas décadas, o presente artigo estudou a viabilidade do uso da fibra do sisal como substrato em bioprocessos. A caracterização do material mostrou que o mesmo apresenta uma composição de 51,00% de celulose, 17,64% de hemicelulose e 12,26% de Lignina. Na etapa de pré-tratamento ácido, a condição que forneceu uma maior produção de açúcares fermentescíveis foi a realizada com 3,5% de H 2 SO 4 e 2 h de reação em autoclave, a uma proporção de material sólido/solução de 1:10 (m/v). INTRODUÇÃODentro do contexto da dinâmica socioeconômica da indústria mundial, é de vital importância o uso de resíduos agroindustriais como matéria-prima para produção de produtos de valor agregado (valorização dos resíduos), tornando-se evidente a necessidade de investimento na produção de bioprodutos.À medida que o conceito de sustentabilidade vem sendo difundido no meio industrial, o emprego de resíduos como matéria-prima para a produção de compostos por fermentação vem se consolidado cada vez mais. Esses resíduos apresentam uma composição bem característica, são os chamados materiais lignocelulósicos, pois os mesmo possuem em sua composição bioquímica basicamente: celulose, lignina e hemicelulose em proporções que variam para cada tipo de material e época/local de cultivo (CANILHA, et al., 2012).Um bom representante dessa classe de materiais é o Agave sisalana, que é de grande relevância econômica em regiões áridas como o Nordeste brasileiro, concentrando-se sua exploração no interior dos Estados da Bahia (87%), Paraíba (7,4%) e Rio Grande do Norte (5,2%). (DA SILVA, et al., 2008).A utilização da fibra do sisal como matéria para a produção via ação microbiológica de compostos bioativos se mostra viável tendo como base a proporção dos polímeros orgânicos que a compõem, sendo as mesmas aproximadamente: 78% celulose, 10% hemicelulose e 9% de lignina e 2% de cinzas (MARTIN, et al., 2009).

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Caracterização química e estrutural de fibra de sisal da variedade Agave sisalana

Cited by 78 publications

References 44 publications

Polyhydroxybutyrate Composites with Random Mats of Sisal and Coconut Fibers

Polyhydroxybutyrate Composites with Random Mats of Sisal and Coconut Fibers

Preliminary phytochemical analysis and the effect of Agave sisalana on body weight and defensive behaviours in ovariectomized rats

Avaliação Do Potencial Da Fibra Do Sisal Como Substrato Em Bioprocessos

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