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Search Results: 1 - 10 of 549 matches for " Marney Pascoli;Sarmento "
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Características físicas de filmes biodegradáveis produzidos a partir de amidos modificados de mandioca
Henrique, Celina Maria;Cereda, Marney Pascoli;Sarmento, Silene Bruder Silveira;
Ciência e Tecnologia de Alimentos , 2008, DOI: 10.1590/S0101-20612008000100033
Abstract: cassava starches may be used as raw materials for developing biodegradable films. some starch modification processes can make them miscible in cold water and others can modify their film properties, making them stronger and more flexible. the aim of this study was to evaluate the physical characteristics of biodegradable films developed from cassava modified starches using the casting process (dehydration of a filmogenic solution on petri dishes). the modified starches used were cross linked, low and high viscosity carboxymethyl starches and esterified starch. starch viscosity is an important property to produce the filmogenic solution and it was tested using the rapid visco analyser (rva). excepting cross linked starch, all modified starches presented cold solubility. this property enables an easier preparation of the filmogenic solutions. however, all modified starches presented a severe reduction of setback values, property associated with film formation. the cassava modified starch films were compared to commercial pvc films of 0.0208 to 0.0217 mm thickness. the cassava modified starch films presented thickness values from 0.0551 to 0.1279 mm. the minimum thickness values were observed in pre-gelatinized and cross linked films. the scanning electron microscopy analysis of the films showed differences among the starches. the resulting films were transparent and homogeneous. there was no significant interference of film thickness in water vapor permeability and the films with 5% dry matter were more permeable than the pvc film. however, when modified starch films are compared to pvc commercial films, there is still much research to be made in the formulation to improve several properties necessary to fulfill the requirements of food packaging today.
Extra??o da fécula retida no resíduo fibroso do processo de produ??o de fécula de mandioca
LEONEL, Magali;CEREDA, Marney Pascoli;
Ciência e Tecnologia de Alimentos , 2000, DOI: 10.1590/S0101-20612000000100023
Abstract: improvement of the extraction process of cassava starch is a problem for researchers and industries in brazil. in the extraction process of cassava starch for each ton of processed root, 250kg of the starch is produced and about 140kg of the starch is wasted in the cassava fibrous residue. a new extraction and auxiliary solutions were evaluated aiming the improvement of the industrial yield. the use of a second extraction, without auxiliary solutions, was possible to recover 20% of the starch that was not extracted in the traditional process.
Caracteriza??o físico-química de algumas tuberosas amiláceas
Leonel, Magali;Cereda, Marney Pascoli;
Ciência e Tecnologia de Alimentos , 2002, DOI: 10.1590/S0101-20612002000100012
Abstract: the commercial starches of the world come mainly from corn, potato and cassava. however, food industries are searching for native starches that can satisfy the technical and economic demands for food production. the present study was conducted to evaluate the physicochemical composition of starchy tubers, saffron, ahipa, arrowroot, sweet potato, biri, yam and arracacha attempting to characterize their industrial potential. the contents of moisture, ash, protein, lipids, reducing and total sugars, fibers and starch were determined in some starchy tubers. the results showed high starch content in arrowroot (maranta arundinacea), yam (dioscorea sp) and biri (canna edulis). the best results for potential starchy yield (t starch/ha) were to yam and biri.
Avalia??o da celulase e pectinase como enzimas complementares, no processo de hidrólise-sacarifica??o do farelo de mandioca para produ??o de etanol
LEONEL, Magali;CEREDA, Marney Pascoli;
Ciência e Tecnologia de Alimentos , 1999, DOI: 10.1590/S0101-20611999000100020
Abstract: this work it was proposed to evaluate the use of complementary enzymes (cellulase and pectinase) in the enzymatic process of hydrolysis-saccharification of the cassava fibrous waste for alcohol production. the results indicated that 63,42% of starch was hydrolyzed in the treatment without complementary enzymes, 89,55% in the treatment with the enzymes, 65,42% with the cellulase by complementary and 88,73% in the pectinase treatment. the pressing was efficacious for sugar recuperation and 10% of total sugar was retaining in the final fibrous residue. the pectinase was the better complementary enzyme enhance the yield.
Extra o da fécula retida no resíduo fibroso do processo de produ o de fécula de mandioca
LEONEL Magali,CEREDA Marney Pascoli
Ciência e Tecnologia de Alimentos , 2000,
Abstract: A melhoria do processo de extra o da fécula de mandioca é um problema bastante discutido entre industriais e pesquisadores. Atualmente, para cada tonelada de raiz de mandioca processada obtêm-se por volta de 250kg de fécula e perde-se no resíduo fibroso cerca de 140kg de fécula que n o foi extraída no processamento. Neste trabalho objetivou-se analisar o efeito de uma segunda extra o em paralelo e o uso de solu es auxiliares na extra o da fécula retida no resíduo fibroso (farelo), visando a melhoria no rendimento industrial. Foram avaliados quatro tratamentos utilizando-se: água (T1), solu o de NaOH 0,2% (T2), solu o água-álcool 10%v/v (T3) e solu o água- Tween 80 0,002% (T4). A partir dos resultados obtidos foi possível concluir que a adi o de solu es auxiliares n o promoveu diferen a significativa (p< 0,05) de extra o em rela o à água (T1), e que uma nova extra o da fécula retida no farelo possibilitaria uma redu o de cerca de 20% no teor de amido do farelo, o qual n o é extraído no processo convencional.
Caracteriza o físico-química de algumas tuberosas amiláceas
Leonel Magali,Cereda Marney Pascoli
Ciência e Tecnologia de Alimentos , 2002,
Abstract: As principais fontes de amido comercial no mundo s o o milho, a batata e a mandioca. Entretanto, nos últimos anos vem crescendo o interesse em amidos naturais que possam ser utilizados pela indústria alimentícia. Assim, este trabalho teve por objetivo caracterizar, quanto à composi o físico-química, a afr o, ahipa, araruta, batata-doce, biri, inhame e mandioquinha-salsa, tuberosas amiláceas potencialmente passíveis de introdu o como matérias-primas de interesse comercial. Amostras das tuberosas foram analisadas quanto ao teor de umidade, cinzas, proteína, matéria graxa, a úcares redutores e totais, fibras e amido. Os resultados obtidos mostraram que das tuberosas analisadas as que apresentaram maior teor de amido foram a araruta (Maranta arundinacea), o inhame (Dioscorea sp) e o biri (Canna edulis), sendo que o inhame e o biri apresentaram também o maior rendimento potencial em toneladas de amido/hectare.
Avalia o da celulase e pectinase como enzimas complementares, no processo de hidrólise-sacarifica o do farelo de mandioca para produ o de etanol
LEONEL Magali,CEREDA Marney Pascoli
Ciência e Tecnologia de Alimentos , 1999,
Abstract: Neste trabalho objetivou-se avaliar o uso de enzimas complementares no processo enzimático de hidrólise e sacarifica o para a produ o de etanol a partir do resíduo fibroso das fecularias. Os resultados obtidos demonstraram que 63,42% do amido foram hidrolisados no tratamento em que n o se utilizaram enzimas complementares. No tratamento com as duas enzimas complementares foram hidrolisados 89,55%, no tratamento com celulase 65,42% e no tratamento com pectinase 88,73%. A prensagem do resíduo após o processo de hidrólise e sacarifica o mostrou-se eficiente, ficando 10,43% do total de a úcares obtidos retidos no resíduo fibroso final. Portanto, o tratamento em que se utilizou a pectinase como enzima complementar na hidrólise foi o melhor. A celulase n o apresentou efeito significativo no rendimento do processo.
Contribui??o da religi?o para com o desenvolvimento local: estudo de caso da organiza??o "Dando as M?os"
Silva, Elizabete Maria da;Cereda, Marney Pascoli;
Intera??es (Campo Grande) , 2011, DOI: 10.1590/S1518-70122011000100009
Abstract: the unstable social tissues of rural brazilian area shows that ownership of the land itself has failed to develop. of the institutions that came into contact with before and after land ownership, religious organizations are most remembered. the article analyzed the role of religion in the social organization of the settlement by interviews with settlers. the trust has stood as the decisive action of restoring the fragile bonds in the studied community.
Pós-colheita de pêssegos (Prunus pérsica L. Bastsch) revestidos com filmes a base de amido como alternativa à cera comercial
Oliveira, Marcelo Alvares de;Cereda, Marney Pascoli;
Ciência e Tecnologia de Alimentos , 2003, DOI: 10.1590/S0101-20612003000400006
Abstract: the main objective of this work was to prolong the shelf life of peaches at ambient conditions. initially, the studies were to get a film forming of cassava starch and bee wax with similar properties of commercial waxes. the second pass was apply in the surface of the fruits, commercial wax (" fruit wax") or film-forming of cassava starch and bee wax. the peaches of the variety 'biuti' were picked in 14/01/1999 and 120 uniform fruits were scratched. the analyses were of loss of fresh mass, respiration, texture, total soluble solids (tss), total acidity, and ph tested every 3 days during 12 days. at first, fruits were put into 0.3g/l of "benomyl" in hot water (52oc) during 2 minutes. four treatments were made: control, fruit wax, film-forming of cassava starch and film forming of cassava starch and bee wax. the fruits treated fruit wax and film forming of cassava starch and bee wax showed improved efficiency in relation to loss of fresh mass to the control and film forming of cassava starch treatments. the respiration was measured to be in the order of 40mg de co2.kg-1.h-1. sugar profile verified that sucrose is a sugar found in larger quantities, and verified traces of glucose and fructose in some samples. equally to total soluble solids, the fruit wax treatment decreased the values of sucrose compared with the control. the use of film forming of cassava starch and bee wax was better than the expectations, being very similar to the fruit wax treatment in all attributes. it was also superior to control and film forming of cassava starch with respect to loss of fresh mass.
Cassava wastewater (manipueira) treatment using a two-phase anaerobic biodigestor
BARANA, Ana Cláudia;CEREDA, Marney Pascoli;
Ciência e Tecnologia de Alimentos , 2000, DOI: 10.1590/S0101-20612000000200010
Abstract: a two-phase anaerobic biodigestor was employed in order to analyze methane production with different manipueira organic loading rates. the acidogenic phase was carried out in a batch process whereas the methanogenic in an up-flow anaerobic fixed bed reactor with continuous feeding. the organic loading rates varied from 0.33 up to 8.48g of chemical demand oxygen (cod)/l.day. the highest content of methane, 80.9%, was obtained with organic loading rate of 0.33g and the lowest, 56.8%, with 8.48gcod/l.d. the highest reduction of cod, 88.89%, was obtained with organic loading rate of 2.25g and the lowest, 54.95%, with 8.48gcod/l.d. from these data it was possible to realize that anaerobic biodigestion can be managed in at least two ways, i.e., for energy production (methane) or for organic loading reduction. the organic loading rate should be calculated as part of the purpose of the treatment to be accomplished.
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