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| Registros recuperados: 72 | |
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| Karimi,Soroush; Moradipour,Pouran; Azandaryani,Abbas Hemati; Arkan,Elham. |
| In the present study, a mucoadhesive non-woven fiber mat (d= 116 nm) was fabricated by the electrospinning method using chitosan (80% Wt), polyethylene oxide (10% Wt), cysteine (4% Wt) and drugs (6% Wt), respectively. In addition, a comparative study was conducted to define effect of drugs and mucoadhesive agent on the nanofiber formation. FTIR, SEM, DSC and DMA were used to investigate the chemical and physical properties of the nanofibers. In vitro release of the drugs was assessed over a 48-hour period by the total immersion method. Release data were fitted to kinetic models, including the zero-order, first-order, Higuchi matrix, and Hixson-Crowell. Zone inhibition investigations were used to describe the inhibition content of vancomycin and amphotericin... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mucoadhesive; Vancomycin; Amphotericin-B; Electrospinning; Aphthous; Chitosan. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502019000100521 |
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| ANDRÉ, W. P. P.; PAIVA JUNIOR, J. R. de; CAVALCANTE, G. S.; RIBEIRO, W. L. C.; ARAÚJO FILHO, J. V. de; SANTOS, J. M. L. dos; ALVES, A. P. N. N.; MONTEIRO, J. P.; MORAIS, S. M. de; SILVA, I. N. G. da; OLIVEIRA, L. M. B. de; ABREU, F. O. M. da S.; BEVILAQUA, C. M. L.. |
| Abstract: The objective of this study was to evaluate the efficacy of carvacryl acetate (CVA) and nanoencapsulated CVA (nCVA) on gastrointestinal nematodes of sheep. The CVA was nanoencapsulated with chitosan/gum arabic and the efficacy of nanoencapsulation (EE), yield, zeta potential, nanoparticle morphology and release kinetics at pH 3 and 8 were analyzed. Acute and subchronic toxicity were evaluated in rodents and reduction of egg counts in the faeces (FECRT) of sheep. The sheep were divided into four groups (n = 10): G1, 250 mg/kg CVA; G2, 250 mg/kg nCVA; G3, polymer matrix and G4: 2.5 mg/kg monepantel. EE and nCVA yield were 65% and 57%, respectively. The morphology of the nanoparticles was spherical, size (810.6±286.7 nm), zeta potential in pH 3.2... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Quitosana; Biocompostos; Acetilação; Nematoide gastrintestinal; Acetato de carvacrila; Segurança toxicológica; Biocompounds; Toxicological safety; Gastrointestinal parasitic nematodes; Ovino; Haemonchus Contortus; Helminto Gastrintestinal; Goma Arábica; Anti-Helmíntico; Parasitose; Chitosan; Gum arabic; Acetylation; Nematode control; Essential oils; Bioactive compounds. |
| Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1125192 |
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| Prado,R.O.F.; Tellez,I.G.; García,M.L.J.; Aldaco,L.L.E.; García,C.A.C.. |
| ABSTRACT The aim of this study was to develop a chitosan biofilm against Salmonella enteritidis, for the conservation of fertile and table eggs. Two experiments were performed. Experiment 1: 400 specific pathogen-free table eggs were divided in a completely randomized design into four treatments, five replicates and each replicate with 20 table eggs. Experimental groups were assigned to control and 1, 5 and 10% chitosan treatment. The eggs were immersed in the chitosan solution. They were then exposed to Salmonella enteritidis and stored for 1, 24, 96 and 168h at 4ºC. The eggs were then washed with 10mL of physiological saline solution. Experiment 2: 80 specific pathogen-free fertile eggs were tested, the assays were assigned to control and 1, 5 and 10%... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chitosan; Fertile eggs; Table eggs; Salmonella enteritidis. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352020000100208 |
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| OLIVEIRA JUNIOR, E. N.; MELO, I. S. de; FRANCO, T. T.. |
| In this work, changes in the hyphal morphology due to chitosan treatment in some fungal species were studied. Scanning electron microscope (SEM) observations revealed that chitosans with molar fraction of acetyl groups (FA 0.16 and 0.18) and degree of polymerization (DP 1,089 and 1,242) had a direct effect on the morphology of the chitosan-treated fungi, reflecting its potential for causing a delay in the growth of Alternaria alternata (500 µg × mL-1), Botrytis cinerea (1,000 µg × mL-1), Penicillium expansum (1,000 µg × mL-1) and Rhizopus stolonifer (500 µg × mL-1). Mycelial aggregation and structural changes such as excessive branching, swelling of the cell wall and hyphae size reduction were observed in the micrographs. |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Alternative control of fungi; Antifungal activity; Fungal morphology; Fungo; Doença fúngica; Chitosan; Antifungal agents; Plant pathogenic fungi. |
| Ano: 2012 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/941619 |
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| Oliveira Junior,Enio Nazaré de; Melo,Itamar Soares de; Franco,Telma Teixeira. |
| In this work, changes in the hyphal morphology due to chitosan treatment in some fungal species were studied. Scanning electron microscope (SEM) observations revealed that chitosans with molar fraction of acetyl groups (F A 0.16 and 0.18) and degree of polymerization (DP 1,089 and 1,242) had a direct effect on the morphology of the chitosan-treated fungi, reflecting its potential for causing a delay in the growth of Alternaria alternata (500 µg × mL-1), Botrytis cinerea (1,000 µg × mL-1), Penicillium expansum (1,000 µg × mL-1) and Rhizopus stolonifer (500 µg × mL-1). Mycelial aggregation and structural changes such as excessive branching, swelling of the cell wall and hyphae size reduction were observed in the micrographs. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chitosan; Alternative control of fungi; Antifungal activity; Plant pathogenic fungi; Fungal morphology. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000500001 |
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| Enrione,Javier; Osorio,Fernando; López,Daniel; Weinstein-Oppenheimer,Caroline; Fuentes,Miguel A; Ceriani,Ricardo; Brown,Donald I; Albornoz,Fernando; Sánchez,Elizabeth; Villalobos,Patricio; Somoza,Rodrigo A; Young,Manuel E; Acevedo,Cristian A. |
| Gelatin, chitosan and hyaluronic acid are natural components used to prepare polymeric scaffold in tissue engineering. The physical properties of these materials confer an appropriate microenvironment for cells, which can be used as a regeneration system for skin and cartilage. In this work, we prepared and characterized a Gelatin/Chitosan/Hyaluronan lyophilized-polymer. Physical properties of lyophilized-polymer changed slightly with moisture, but when polymer was totally hydrated the elasticity changed significantly. Thermophysical characterisation indicated that temperatures higher than 30ºC could modify irreversibly the polymeric matrix probably due to protein denaturation. Besides, we used the polymer as scaffold to prepare a biosynthetic-skin,... |
| Tipo: Journal article |
Palavras-chave: Chitosan; Fibrin; Gelatin; Hyaluronic acid; Scaffold. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500020 |
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| YE,Lizhu; CHEN,Huibin. |
| Abstract This research investigated the interaction between chitosan and whey protein molecules in terms of pH and heating. The FTIR, rheological analysis, turbidity, and zeta potential measurements were used to assess this interaction. At pH 4.0, addition of low amount chitosan with chitosan/whey protein isolate (C/WPI) ratio of 1:5 effectively prevented the denaturation of whey proteins after heating, whereas high amount of chitosan (C/WPI,1:2) led to depletion flocculation. The combination of chitosan and whey proteins was electrostatic attracting at pH 5.5 and 6.0. At low chitosan addition, the complexes formed at pH 5.5 showed higher viscosity and the complexes formed at pH 6.0 showed a shear-thinning behaviour. At high chitosan addition, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chitosan; Whey protein; Molecule; Interaction; PH. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612019000100163 |
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| İZCİ,Levent; EKİCİ,Furkan; GÜNLÜ,Ali. |
| Abstract In the investigate, we objectived to assess the effect of coating with chitosan film on the shelf life. To this end, skinless sea bream fillets were separated as control group (C), vacuum packed (VP) and coated with chitosan film and vacuum packed (CF+VP). Samples of each group were periodically analyzed for microbiological [Total mesophilic aerobic count (TMAc) and Total psychrophilic aerobic count (TPAc)] and physicochemical [pH, Total volatile basic nitrogen (TVB-N), Thiobarbituric acid (TBA) and Trimethylamine nitrogen (TMA-N)] in storage time. It was determined that CF+VP had the highest shelf life among the sample groups. The findings of the study showed that covering sea bream fillets with chitosan film and vacuum packaging significantly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sea bream; Chitosan; Film coating; Shelf life. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612018000100054 |
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| MENEZES, F. L. de. |
| O progresso da eletrônica nos últimos anos tem aumentado a necessidade de materiais leves, flexíveis, de alta razão eficiência/volume e biodegradáveis. Polímeros naturais podem ser usados para esse intuito. Significantes contribuições à miniaturização e performance desses materiais são reportadas na literatura quando um preenchimento de fases magneto-dielétricas é disperso nessas matrizes. Esse trabalho apresenta diferentes compósitos obtidos com a dispersão de nanopartículas superparamagnéticas (NPMs) em três biomacromoléculas: quitosana, colágeno e celulose. Suas propriedades térmicas, morfológicas, estruturais, dielétricas e magnéticas, bem como a elaboração de um substrato para antenas microfita, foram avaliados. NPMs de Fe3O4 foram sintetizadas e... |
| Tipo: Tese/dissertação (ALICE) |
Palavras-chave: Antenas de microfita; Celulose; Colágeno; Chitosan; Cellulose; Collagen; Magnetite. |
| Ano: 2018 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1103405 |
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| Rotta,Jefferson; Minatti,Edson; Barreto,Pedro Luiz Manique. |
| In this work, the structural, mechanical, diffractometric, and thermal parameters of chitosan-hydroxypropylmethylcellulose (HPMC) films plasticized with sorbitol were studied. Solutions of HPMC (2% w/v) in water and chitosan (2% w/v) in 2% acetic acid solution were prepared. The concentration of sorbitol used was 10% (w/w) to both polymers. This solutions were mixed at different proportions (100/0; 70/30; 50/50; 30/70, and 0/100) of chitosan and HPMC, respectively, and 20 mL was cast in Petri dishes for further analysis of dried films. The miscibility of polymers was assessed by X-ray diffraction, scanning electronic microscopy (SEM), differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). The results obtained indicate that the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Films; Chitosan; Hydroxypropylmethylcellulose; Physico-chemical properties. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612011000200026 |
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| Registros recuperados: 72 | |
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