Alginato bacteriano: aspectos tecnológicos, características e produção

García-Cruz, Crispin Humberto; Foggetti, Ulisses; Silva, Adriana Navarro da

doi:10.1590/s0100-40422008000700035

Cited by 22 publications

(14 citation statements)

References 37 publications

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“…Studies on commercial EPS applications are more advanced for the free-living NFB, e.g., clairana produced by Beijerinckia sp. (Moreira et al, 2003) and the alginate produced by Azotobacter vinelandii (Garcia-Cruz et al, 2008).…”

Section: Possible Industrial Applications Of Rhizobium Epsmentioning

confidence: 99%

Exopolysaccharides produced by the symbiotic nitrogen-fixing bacteria of leguminosae

Bomfeti

Florentino

Guimarães³

et al. 2011

Rev. Bras. Ciênc. Solo

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SUMMARYThe process of biological nitrogen fixation (BNF), performed by symbiotic nitrogen fixing bacteria with legume species, commonly known as α and β rhizobia, provides high sustainability for the ecosystems. Its management as a biotechnology is well succeeded for improving crop yields. A remarkable example of this success is the inoculation of Brazilian soybeans with Bradyrhizobium strains. Rhizobia produce a wide diversity of chemical structures of exopolysaccharides (EPS). Although the role of EPS is relatively well studied in the process of BNF, their economic and environmental potential is not yet explored. These EPS are mostly species-specific heteropolysaccharides, which can vary according to the composition of sugars, their linkages in a single subunit, the repeating unit size and the degree of polymerization. Studies have showed that the EPS produced by rhizobia play an important role in the invasion process, infection threads formation, bacteroid and nodule development and plant defense response. These EPS also confer protection to these bacteria when exposed to environmental stresses. In general, strains of rhizobia that produce greater amounts of EPS are more tolerant to adverse conditions when compared with strains that produce less. Moreover, it is known that the EPS produced by microorganisms are widely used in various industrial activities. These compounds, also called biopolymers, provide a valid alternative for the commonly used in food industry through the development of products with identical properties or with better rheological characteristics, which can be used for new applications. The microbial EPS are also able to increase the adhesion of soil particles favoring the mechanical stability of aggregates, increasing levels of water retention and air flows in this environment. Due to the importance of EPS, in this review we discuss the role of these compounds in the process of BNF, in the adaptation of rhizobia to environmental stresses and in the process of soil aggregation. The possible applications of these biopolymers in industry are also discussed.Index terms: Exopolysaccharides, nodules, environmental stress, soil aggregation, rhizobia. RESUMO: EXOPOLISSACARÍDEOS PRODUZIDOS POR BACTÉRIAS FIXADORAS DE NITROGÊNIO SIMBIÓTICAS DE LEGUMINOSAE O processo de fixação biológica de nitrogênio (FBN), realizado por bactérias fixadoras de

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Section: Possible Industrial Applications Of Rhizobium Epsmentioning

confidence: 99%

Exopolysaccharides produced by the symbiotic nitrogen-fixing bacteria of leguminosae

Bomfeti

Florentino

Guimarães³

et al. 2011

Rev. Bras. Ciênc. Solo

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“…Its gels have the capacity to form microbeads and incorporate enzymes or whole live cells, thus arousing interest in the food industry, biotechnology and biomedical sector (Garcia‐Cruz et al . ).…”

Section: Introductionmentioning

confidence: 97%

“…It is used as stabilizer, thickener and gelling agent in the food industry and also for cell immobilization in the pharmaceutical and biotechnology industry. Its gels have the capacity to form microbeads and incorporate enzymes or whole live cells, thus arousing interest in the food industry, biotechnology and biomedical sector (Garcia-Cruz et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Alginate/PVA Beads for Levan Production by Zymomonas mobilis

Lorenzetti

Moro

García-Cruz

2014

J Food Process Engineering

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The levan is a biopolymer of great importance to the food industry since it is capable of defining and modifying the structure of one food, acting as stabilizer, thickener, gelling agent and being largely responsible for the texture of processed foods. The levan production by bacterial cell immobilization may potentialize the results of these studies, having advantages such as: high cell concentrations inside the reactor, increase the substrate absorption rate, improve the performance and reduce the risk of microbial contamination. Thus, this study aims to evaluate the levan production by immobilized Zymomonas mobilis in hybrid system of alginate/polyvinyl alcohol (PVA) when submitted to different sucrose concentrations (5, 10, 25 and 30%), pH (5.7 and 7.0) and incubation temperature of 30C for 12, 18 and 24 h. The results showed that the best levan production rate was 18.66 g/L at 30% sucrose concentration, with productivity 1.55 g/L/h at pH 7.0. Practical Applications The biopolymer called levan is a nontoxic, nonmutagenic, odorless, tasteless and soluble dietary fiber; it has physiological effects that depend on its size and linkage type, and its fermentability. It can be produced by bacterial fermentation like Zymomonas mobilis. The administration of levan in human diet (5.5–6 g, twice a day) for 2–3 months reduced body weight and body fat mass. The input of levan showed in some studies an increase of divalent cation (Zn, Mg and Fe) and calcium absorption in rats. In the food industry, levan improves the rheological properties and functional characteristics of dairy products, such as yogurt. Its application includes use as a stabilizer, emulsifier, surface agent, encapsulating agent and flavor and fragrances carrier.

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“…Rodrigues (2010) e Silva (2007) reafirmam que o alginato é o componente mais usado para a imobilização de células. O alginato é extraído de espécies de algas marinhas marrons (Phaeophyta), está presente na estrutura da parede celular e espaços intracelulares dessas algas, conferindo rigidez e ao mesmo tempo flexibilidade à parede celular; constitui cerca de 40% da matéria seca destes organismos (GARCIA-CRUZ;FOGGETTI;SILVA, 2008).…”

Section: -Introduçãounclassified

Potencial de remoção de fósforo em biorreator operado com células de Chlorella sp imobilizadas em matriz de alginato de cálcio

Araújo¹,

Sousa²,

Leite³

et al. 2018

cieng

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RESUMO Esta pesquisa teve como objetivo avaliar a remoção do fósforo presente em efluente secundário por meio da ação de células da microalga Chlorella sp imobilizadas em matriz de alginato de cálcio. Para tanto, as células, previamente cultivadas em Meio Basal Bold (MBB) e submetidas a procedimentos de imobilização, foram colocadas em biorreator tubular operado sob condições de fluxo ascendente do resíduo líquido. Foram realizadas duas etapas experimentais, cada uma composta por cinco ensaios em ambiente com temperatura controlada a 27 ºC e iluminação artificial pelo emprego de duas lâmpadas fluorescentes de 40 Watts. As etapas se diferenciaram pelo uso ou não de recirculação do efluente durante os períodos experimentais. Os regimes de alimentação foram em batelada intermitente, com tempo de reação de uma a cinco horas. Os resultados alcançados mostram a eficiência de 88% e 95% de remoção de fósforo, respectivamente, para o sistema quando operado sem e com recirculação do efluente. Palavras-chave: Tratamento biológico, águas residuárias, remoção de nutrientes, microalgas.

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Alginato bacteriano: aspectos tecnológicos, características e produção

Cited by 22 publications

References 37 publications

Exopolysaccharides produced by the symbiotic nitrogen-fixing bacteria of leguminosae

Exopolysaccharides produced by the symbiotic nitrogen-fixing bacteria of leguminosae

Alginate/PVA Beads for Levan Production by Zymomonas mobilis

Potencial de remoção de fósforo em biorreator operado com células de Chlorella sp imobilizadas em matriz de alginato de cálcio

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