Dextransucrase
Mostrando 1-12 de 52 artigos, teses e dissertações.
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1. Scale up of dextran production from a mutant of Pediococcus pentosaceus (SPAm) using optimized medium in a bioreactor
The mutant of Pediococcus pentosaceus (SPAm) produced earlier by UV-mutagenesis exhibiting higher dextransucrase activity as compared to wild-type was used. The generated mutant SPAm gave 12.2 mg/ml, a 20% higher dextran than wild-type. Response surface methodology was carried out for further enhancement of dextran production. To enhance dextran production b
Brazilian Archives of Biology and Technology. Publicado em: 2011-12
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2. Suco de caju contendo oligossacarÃdeos prÃbioticos / Cashew juice containing prebiotic oligosaccharides
Os alimentos funcionais constituem hoje prioridade em pesquisas devido a crescente busca dos consumidores por alimentos que alÃm da funÃÃo bÃsica de nutrir possam trazer outros benefÃcios. Dessa forma, estudos para o desenvolvimento de prebiÃticos tornam-se interessantes. A enzima dextrana-sacarase quando em meio contendo sacarose e um aceptor como sub
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/06/2010
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3. Aproveitamento do pedÃnculo do caju para sÃntese de oligossacarÃdeos prebiÃticos / Exploitation of the cashew of the prebiootic synthesis
Leuconostoc mesenteroides B742 produces the enzyme dextransucrose in a medium containing sucrose (carbon source), a nitrogen source and mineral salts. This enzyme catalyses dextran synthesis when the only carbon source is sucrose. When acceptors (maltose, fructose, glucose or other simple sugar) are present as the main substrate and sucrose is the second one
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/02/2008
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4. The dextran production by three new bacteria strains isolated from sugar cane / Produção de dextrana por novas linhagens de bacterias isoladas da cana-de-açucar
Dextranas são polissacarídeos produzidos pela bactéria pertencente à família Lactobacileae constituídos de moléculas de glicose unidas por ligações a-(1-6) na cadeia principal e ligações ?-(1-4), a-(1-3) e ?-(1-2) nas ramificações. A enzima dextranasacarase, responsável por sua síntese, é extracelular e tem a sacarose como principal indutor.
Publicado em: 2006
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5. Scale-up of dextransucrase production by Leuconostoc mesenteroides in fed batch fermentation
Fermentação em batelada alimentada foi realizada visando a produção da enzima dextransucrase a partir de Leuconostoc mesenteroides e o seu escalonamento foi realizado usando critérios da transferência de oxigênio. Foi determinado que em fermentador de vaso de 5L de capacidade, a melhor velocidade de agitação foi de 225 m-1 e a taxa de aeração foi
Brazilian Archives of Biology and Technology. Publicado em: 2003-06
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6. Seleção de linhagens produtoras de goma isoladas da cana-de-açucar
The aim of this work was to isolate and select potentia1ly gum producing strains present in sugar cane. Guns are biopolymers carne 1Tom vegetal (e.g., guar gurn, carragen gum) or microbian (e.g., xantan gum, dextran gum) source. Dextran producing bacteria are 1Tequently found in damaged sugar cane. Dextran is a biopolymer that consists of a-Dglucose monomeri
Publicado em: 2003
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7. Separation of glucose, fructose, oligosaccharides and dextran using zeolites / Separação de glicose, frutose, oligossacarideos e dextranas utilizando zeolitas
Dextransucrase from Leuconostoc mesenteroides synthesizes dextran from sucrose in the absence of aceptors, and oligosaccharides with maltose or other sugars as aceptors. Fructose is also produced as a by-product. Among several producer strains Leuconostoc mesenteroides NRRL B-512F is the most studied. The commercial value of these products increases with the
Publicado em: 2003
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8. Sintese do processo de obtenção de dextrana clinica e frutose a partir de sacarose
Dextran is a polysaccharid exclusively composed of monomeric units of glucose, joined by a-1,6 glucosidic bonds at the linear position. This polysaccharid is of a great industrial interest at the petrochemistry, food, chemistry and pharmaceutical areas. During the synthesis process of dextran occurs the frutose liberation, that is a monosaccharid of high int
Publicado em: 2001
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9. Estudo da produção de dextrana de baixo peso molecular por via enzimatica, para obtenção de ferro-dextrana
The production of low molecular weight dextran during enzimatic reaction with raw dextransucrase from Leuconostoc mesenteroides NRRL B-512 F in different concentrations of sucrose and maltose as acceptor was studied. In the absence of maltose, the increase of sucrose concentration resulted both low molecular weight polysaccharide and native dextran formation
Publicado em: 1993
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10. Estudo de produção enzimatica da dextrana clinica
This study consists of the "in vitro" production of clinical dextran from sucrose using the enzyme dextransucrase obtained from Leuconostoc mesenteroides NRRl B512-F. Clinical dextran, whose average molecular weight is 40,000 daltons, is extensively used as a volume expander of human blood. The enzyme was produced by fermentation; purified by ultracentrifuga
Publicado em: 1993
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11. Origin of the Cell-Associated Dextransucrase of Streptococcus mutans
The cell-associated dextransucrase produced by sucrose-grown cells of cariogenic Streptococcus mutans K1-R is derived from soluble dextransucrase. Synthesis of insoluble dextran by soluble dextransucrase gives rise to two dextransucrase fractions bound to the insoluble polysaccharide; a reversibly bound enzyme, which can be eluted in solutions of clinical de
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12. Distribution of dextransucrase in Streptococcus mutans and observations on the effect of soluble dextran on dextransucrase activities.
Total and insoluble dextransucrase activities were measured in cell-associated and supernatant fractions of Streptococcus mutans GS-5 grown in several media. Although the amount of cell-associated and supernatant activity varied greatly as a function of medium, the total activity appeared constant. The distribution of dextransucrase could be altered without