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| Registros recuperados: 45 | |
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| Sánchez Portillo, Juan Fernando. |
| El nematodo agallador Meloidogyne incognita Kofoid y White, 1919, Chitwood, 1949, distribuido en 23 de los 32 estados del país y Nacobbus aberrans Thorne 1935, Thorne and Allen, 1944, distribuido en 10 de 32 estados de la República Mexicana, su combate para ambas especies, casi siempre se hace aplicando diferentes agroquímicos, los cuales algunos ya tienen problemas de registro. Se necesita evaluar nuevos productos que sean otra alternativa a su manejo y mas amigables al ambiente. En el presente trabajo se evaluó el efecto de quitina-quitosano con diferentes grados de desacetilación, biopolímeros naturales que poseen propiedades nematicidas y utilizados como reguladores de la población de estos fitonematodos; los estudios se hicieron in vitro, sobre la... |
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Palavras-chave: Biopolímero natural; Meloidogyne incognita; Nacobbus aberrans; Desacetilación; Control; Quitina; Quitosano; Chitin; Chitinase; Natural biopolymer; Chitosan; Deacetylation; Fitopatología; Maestría. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/55 |
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| Sánchez Portillo, Juan Fernando. |
| El nematodo agallador Meloidogyne incognita Kofoid y White, 1919, Chitwood, 1949, distribuido en 23 de los 32 estados del país y Nacobbus aberrans Thorne 1935, Thorne and Allen, 1944, distribuido en 10 de 32 estados de la República Mexicana, su combate para ambas especies, casi siempre se hace aplicando diferentes agroquímicos, los cuales algunos ya tienen problemas de registro. Se necesita evaluar nuevos productos que sean otra alternativa a su manejo y mas amigables al ambiente. En el presente trabajo se evaluó el efecto de quitina-quitosano con diferentes grados de desacetilación, biopolímeros naturales que poseen propiedades nematicidas y utilizados como reguladores de la población de estos fitonematodos; los estudios se hicieron in vitro, sobre la... |
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Palavras-chave: Biopolímero natural; Meloidogyne incognita; Nacobbus aberrans; Desacetilación; Control; Quitina; Quitosano; Chitin; Chitinase; Natural biopolymer; Chitosan; Deacetylation; Fitopatología; Maestría. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/55 |
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| Valenzuela,Carolina; Tapia,Cristian; López,Luis; Bunger,Andrea; Escalona,Victor; Abugoch,Lilian. |
| Background Strawberries are non-climacteric fruits with a low respiration rate, but are subject to serious fungal deterioration during postharvest handling. The edible coatings based on chitosan (CH), quinoa protein-chitosan (Q/CH) and quinoa protein-chitosan-sunflower oil (Q/CH/SO) may provide a solution to this problem. Thus, in this work CH, Q/CH and Q/CH/SO were elaborated and applied to fresh strawberries, and its effect on the strawberries shelf life during storage for 15 d was evaluated by mold and yeast count, fungal decay, carbon dioxide rate, physicochemical properties, and sensory evaluation. Results On all analysis days, the strawberries coated with the film-forming CH, Q/CH and Q/CH/SO solutions presented a significant lower amount of mold and... |
| Tipo: Journal article |
Palavras-chave: Chitosan; Edible films; Quinoa protein; Strawberry; Sunflower oil. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600004 |
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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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| Stamford,Thayza Christina Montenegro; Stamford,Tânia Lucia Montenegro; Stamford,Newton Pereira; Barros Neto,Benicio de; Campos-Takaki,Galba Maria de. |
| Microbiological processes were used for chitin and chitosan productions by Cunninghamella elegans (UCP 542) grown in a new economic culture medium. The assay was carried out to evaluate the growth of C. elegans using yam bean (Pachyrhizus erosus L. Urban) medium, in different times of growth (24, 48, 72 and 96 hrs), incubated at 28ºC in an orbital shaker at 150 rpm. The lyophilized biomass was determined by gravimetry. The polysaccharides were extracted by alkali-acid treatment, and characterized by infrared spectroscopy, titration and viscosity. C. elegans grown in the yam bean medium and produced higher yields of biomass (24.3 g/ mL) in 96 hrs. The high level was chitosan (66 mg/g), and chitin (440 mg/g) were produced at 48 and 72 hrs of growth,... |
| Tipo: Journal article |
Palavras-chave: Biopolymers; Chitin; Chitosan. |
| Ano: 2007 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100006 |
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| Wiernasz, Norman; Cornet, Josiane; Cardinal, Mireille; Pilet, Marie-france; Passerini, Delphine; Leroi, Francoise. |
| As fragile food commodities, microbial and organoleptic qualities of fishery and seafood can quickly deteriorate. In this context, microbial quality and security improvement during the whole food processing chain (from catch to plate), using hurdle technology, a combination of mild preserving technologies such as biopreservation, modified atmosphere packaging and superchilling, are of great interest. Thirty-five lactic acid bacteria (LAB) belonging to the species Carnobacterium maltaromaticum, Carnobacterium inhibens, Lactococcus piscium, Leuconostoc gelidum, Vagococcus fluvialis, Vagococcus penaei and Aerococcus viridans, known to possess interesting antimicrobial activity, were chosen for their potential application as bioprotective agents as a part of... |
| Tipo: Text |
Palavras-chave: Antimicrobial activity; Spoilage; Screening; Chitosan; Fish juice; Safety assessment. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00382/49342/49732.pdf |
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| García, M.A.; Díaz, R.; Puerta, F.; Beldarraín, T.; Castillo, A.; González, J.; Duarte, C.. |
| El objetivo del estudio fue evaluar la influencia de coberturas de quitosana en lascas de jamón cocido y jamón Visking envasadas al vacío. En ambos productos se observó un incremento de la acidez, mayor en los productos con coberturas de quitosana. Se produjo un aumento de la dureza con el tiempo, sin que existieran diferencias significativas (p≤0,05) atribuibles a la aplicación de coberturas. Se encontró un efecto favorable de las coberturas de quitosana en cuanto a retardar el desarrollo de los psicrófilos. La calidad sensorial fue el parámetro que más se afectó durante el almacenamiento; en el jamón cocido el sabor se tornó ácido y se observó un exudado lechoso y en el jamón Visking los jueces refirieron olores y sabores atípicos y una disminución... |
| Tipo: Journal Contribution |
Palavras-chave: Conservation; Cold storage; Packaging materials; Sausages; Hams; Chitosan; Wrapping. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/4892 |
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| García, M.; Díaz, R.; Casariego, A.; Bolumen, S.; de Hombre, R.; González, I.; Rodríguez, I.; Salgado, J. M.. |
| Se aplicaron coberturas de quitosana en pimientos (Capsicum annuum L.) con el objetivo de evaluar su influen- cia en el mejoramiento de la calidad y prolongación del perío- do de conservación. Cada lote de pimientos fue tratado en forma diferente, considerando muestras sin tratar y tratadas con disoluciones de quitosana. Las coberturas se aplicaron mediante pinceladas con disoluciones a 1 y 2 % (m/v) de quitosana en ácido láctico a 1 %. Posterior al secado de los frutos, estos se envasaron en bolsas de polietileno de baja densidad. Se determinaron varios parámetros de calidad du- rante el almacenamiento de 10 a 12 ºC: pérdida de peso, textu- ra, sólidos solubles, pH y evaluación sensorial mediante el análisis descriptivo cuantitativo. Las coberturas de... |
| Tipo: Journal Contribution |
Palavras-chave: Preservation (organisms); Green peppers; Bell peppers; Chitosan. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/5059 |
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| Casariego, A.; Díaz, R.; Sergrañes, Y.; Nieto, O. M.; Durán, C.; López, N; Rodríguez, M.; González, J.. |
| Se elaboraron películas a partir de disoluciones a 3 % (m/v) de quitosana en ácido láctico a 1% (v/v), empleando glicerina, sorbitol o polietilenglicol como plastificante en concentraciones de 0,25 a 0,50 mL/g de quitosana. Se midieron el esfuerzo tensil, elongación, fuerza de ruptura, deformación y el espesor de las películas, con el objetivo de evaluar la influencia de la masa molar y concentración de plastificante sobre sus propiedades mecánicas. Se obtuvieron los modelos matemáticos que relacionan estos factores. Las películas con polietilenglicol, presentaron mayor esfuerzo tensil y fuerza de ruptura normalizada que las plastificadas con glicerina o sorbitol, pero resultaron menos elásticas y deformables, además, mientras mayor fue la concentración de... |
| Tipo: Journal Contribution |
Palavras-chave: Mechanical properties; Chitosan; Biopolymers; Elasticity. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/5095 |
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| Rodrigues,Antonio Augusto Marques; Silva,Silvanda de Melo; Dantas,Ana Lima; Silva,Antonio Fernando da; Santos,Leonardo da Silva; Moreira,Dayse das Neves. |
| Abstract The aim of this work was to evaluate the effect of jackfruit seed starch-based (S) coatings, added to chitosan and alginate on the physiology and maintenance of quality of cold stored ‘Paluma’ guavas, followed by transfer to the room condition. The design was the completely randomized, in a 4x2 factorial scheme, in 4 replications, with 4 coatings (dispersion of S - 4%; S 2% + chitosan - 2% (SC); S - 2% + alginate - 2% (SA); and the uncoated control), in 2 environments (refrigerated (10±2 °C e 80±2% RH) with transfer to room condition (25±3 °C e 75±4% HR)), on the 16th and 20th day of cold storage. The SC and SA coatings were efficient in reducing the respiratory rate in fruits during 10 days at room condition. The SC coating delayed fruit... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Artocarpus heterophyllus; Fruit waste; Chitosan; Sodium alginate; Fruit quality. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000200303 |
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| Taghinezhad, Ebrahim; Rasooli Sharabiani, Vali. |
| Most of the world's consumers have used the natural coatings instead of chemical coatings. In this research, some quality properties of Thomson orange were evaluated using Chitosan edible coating (at concentrations of 0.5, 1 and 2%) and chemical coating of fungicide (Ortho Phenyl Phenol) as compared to uncoated samples during storage for three months. Fruit were maintained in cold storage at 6 °C temperature and 85-90% relative humidity, then pH, total soluble solid (TSS) of orange juice and percentage of fruit weight loss were measured during storage every month. The results showed that weight loss of fruit with 2% chitosan coating was lower than other treatments. Also this treatment had high resistance against fungal attacks due to high values of pH, so... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chitosan; Citrus; Fungicide; Quality; Storage. |
| Ano: 2018 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4189 |
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| FINISIE,MELLATIE R.; JOSUÉ,ATCHE; FÁVERE,VALFREDO T.; LARANJEIRA,MAURO C. M.. |
| Bioceramic composites were obtained from chitosan and hydroxyapatite pastes synthesized at physiological temperature according to two different syntheses approaches. Usual analytical techniques (X-ray diffraction analysis, Fourier transformed infrared spectroscopy, Thermo gravimetric analysis, Scanning electron microscopy, X-ray dispersive energy analysis and Porosimetry) were employed to characterize the resulting material. The aim of this investigation was to study the bioceramic properties of the pastes with non-decaying behavior from chitosan-hydroxyapatite composites. Chitosan, which also forms a water-insoluble gel in the presence of calcium ions, and has been reported to have pharmacologically beneficial effects on osteoconductivity, was added to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioceramic; Chitosan; Hydroxyapatite; Composites; Bone regeneration. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000400006 |
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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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| Grade,Luciana Carvalho; Moreira,Amanda Aleixo; Varea,Geni da Silva; Mandarino,José Marcos Gontijo; Silva,Josemeyre Bonifácio da; Ida,Elza Iouko; Ribeiro,Mara Lúcia Luiz. |
| The objective of this study was to investigate the immobilisation efficiency of soybean β-glucosidase (181.6 U/mL; 23.8 mg protein/mL) on activated chitosan beads. Central Composite Rotational Design (CCDR) 23 was used and the application of immobilised enzyme in commercial soy drink was evaluated. The activation of chitosan beads was achieved with established 2.5% glutaraldehyde, pH 7.5, 8 h incubation time (6 h with agitation and 2 h without agitation) at 37ºC. The highest immobilisation efficiency (%) of soybean β-glucosidase on chitosan beads obtained was 37.74 U/mL and 18.84 mg protein/4 chitosan beads at pH 7.5 and 20 h coupling time of enzyme-matrix (7 h with agitation and 13 h without agitation) at 4ºC. The immobilised enzyme incubated at 50ºC, pH... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Β-glucosidase soybean; Immobilisation; Chitosan; Aglycones. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000500766 |
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| Cavargere,Victor Agati; França,Camille Feitoza; Cardoso,Ricardo; Vianna,Lucia Marques. |
| Several studies characterize the connection of overweight and obesity with chronic diseases. Therefore, new alternatives are being studied for controlling hypertension, such as chitin and chitosan fibers, commonly found on crustacean's carapace like Emerita brasiliensis. Rats from two different strains were divided into control and supplemented groups (n=6). The Wistar strain experiment started with a 14-days baseline period, followed by supplementation of E.brasiliensis flour added to the diet in the doses of 5, 10 and 20%, for a 14-days period each. With the optimal dose of 20%, the study was undertaken with SHR rats, starting with a 7-days baseline period, followed by three weeks of supplementation. Data were evaluated using one-way ANOVA and p<0.05... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chitin; Chitosan; Emerita brasiliensis; Blood pressure. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000400006 |
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| Registros recuperados: 45 | |
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