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| Registros recuperados: 69 | |
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| VASCONCELOS, N. F.; FEITOSA, J. P. DE A.; GAMA, F. M. P. DA; MORAIS, J. P. S.; ANDRADE, F. K.; SOUZA FILHO, M. de S. M. de; ROSA, M. de F.. |
| Bacterial cellulose (BC) is a polymer with interesting physical properties owing to the regular and uniformstructure of its nanofibers, which are formed by amorphous (disordered) and crystalline (ordered) regions.Through hydrolysis with strong acids, it is possible to transform BC into a stable suspension of cellulosenanocrystals, adding new functionality to the material. The aim of this work was to evaluate the effectsof inorganic acids on the production of BC nanocrystals (BCNCs). Acid hydrolysis was performed usingdifferent H2SO4concentrations and reaction times, and combined hydrolysis with H2SO4and HCl wasalso investigated. The obtained cellulose nanostructures were needle-like with lengths ranging between622 and 1322 nm, and diameters ranging between... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Nanocristais de celulose; Celulose bacteriana; Hidrólise; Ácido sulfúrico; Ácido clorídrico; Hydrolysis; Sulfuric acid; Hydrochloric acid. |
| Ano: 2017 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1083533 |
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| LIMA, H. L. S.; NASCIMENTO, E. S.; ANDRADE, F. K.; BRIGIDA, A. I. S.; BORGES, M. de F.; CASSALES, A. R.; MUNIZ, C. R.; SOUZA FILHO, M. de S. M. de; MORAIS, J. P. S.; ROSA, M. de F.. |
| In this study, we have optimized production of bacterial cellulose (BC) by Komagataeibacter hansenii ATCC 23769 in a static cultivation using sisal juice, an agroindustrial residue, as substrate. Optimization of fermentation parameters has been carried out using the one-variable-at-a-time method. Effect of initial sugar concentration, pH, nitrogen supplement, and cultivation time was evaluated. The influence of nitrogen source and quantity for bacterial cellulose production was studied using a central composite rotational design (CCRD).The highest production of BC (3.38 g/L) was obtained after 10 days of cultivation, using sisal juice (pH 5) at 15 g/L of sugars and supplemented with 7.5 g/L of extract yeast. The cellulose production yield in selected sisal... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Celulose bacteriana; Komagataeibacter hansenii; Nanotecnologia; Resíduo agroindustrial; Nanotechnology; Sisal; Sisal. |
| Ano: 2017 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1087796 |
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| LIMA, H. L. S.; NASCIMENTO, E. S.; ANDRADE, F. K.; BRIGIDA, A. I. S.; BORGES, M. de F.; CASSALES, A. R.; MUNIZ, C. R.; SOUZA FILHO, M. de S. M. de; MORAIS, J. P. S.; ROSA, M. de F.. |
| bitstream/item/177378/1/ART18009.pdf |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Bacterial cellulose; Sisal juice; Komagataeibacter hansenii; Agroindustrial waste; Celulose bacteriana; Suco de sisal; Resíduos Agroindustriais; Nanotecnologia; Nanotechnology. |
| Ano: 2017 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1091104 |
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| FIGUEIREDO, M. C. B. de; MATSUURA, M. I. da S. F.; SOUZA FILHO, M. de S. M. de; ROSA, M. de F.; BRAID, A. C. C. S.; DIAS, A. F.. |
| Resumo This work compares the environmental impacts of cellulose nanowhiskers obtained from four tropical vegetal fibers: cotton linter, cotton plume, green coconut husk, and sugarcane bagasse. Life cycle impact assessment was performed, according to ISO 14040, considering the following impact categories: eutrophication, human toxicity, ecotoxicity, and climate change. The evaluation showed that the lowest impacts occur when cotton plume is used as the source of cellulose to the extraction of nanowhiskers. |
| Tipo: Artigo em anais de congresso (ALICE) |
Palavras-chave: Avaliação do ciclo de vida; Fibra vegetal; Algodão; Coco; Bagaço; Cana de açúcar; Impacto ambiental; Life cycle assessment; Environmental impact; Lint cotton; Sugarcane bagasse; Cellulosic fibers. |
| Ano: 2013 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/963551 |
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| LEITAO, R. C.; CASSALES, A. R.; ALEXANDRE, L. C.; PINHEIRO, F. G. C.; SOARES, A. K. L.; BRITO, M. Z. R. de; VALE, M. do S.; SOUZA FILHO, M. de S. M. de; SANTAELLA, S. T.; ROSA, M. de F.. |
| 2016 |
| Tipo: Comunicado Técnico (INFOTECA-E) |
Palavras-chave: Resinas fenol-formaldeído; Biomassa lignocelulósica; Processo organossolve; Indústria sucroalcooleira; Resinas fenol-formaldeído; Biomassa lignocelulósica; Processo organossolve; Indústria sucroalcooleira. |
| Ano: 2016 |
URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/1058470 |
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| Registros recuperados: 69 | |
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