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An overview of lignin metabolism and its effect on biomass recalcitrance Rev. Bras. Bot.
Cesarino,Igor; Araújo,Pedro; Domingues Júnior,Adilson Pereira; Mazzafera,Paulo.
Lignin, after cellulose, is the second most abundant biopolymer on Earth, accounting for 30% of the organic carbon in the biosphere. It is considered an important evolutionary adaptation of plants during their transition from the aquatic environment to land, since it bestowed the early tracheophytes with physical support to stand upright and enabled long-distance transport of water and solutes by waterproofing the vascular tissue. Although essential for plant growth and development, lignin is the major plant cell wall component responsible for biomass recalcitrance to industrial processing. The fact that lignin is a non-linear aromatic polymer built with chemically diverse and poorly reactive linkages and a variety of monomer units precludes the ability of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biopolymer; Genetic engineering; Phenylpropanoids; Wall components.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000400003
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Antimicrobial activity of nisin in film and coating chitosan. Repositório Alice
BENEVIDES, S. D.; BORGES, M. de F.; SOUSA, C. R. V.; SILVA, S. M. F.; MARTINS, C. M.; CHAGAS, B. S.; BARROSO, M. K. A.; BASTOS, M. do S. R.; ROSENTHAL, A..
2015
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Biopolímero; Propriedades antimicrobianas; Quitosana; Biopolímero; Propriedades antimicrobianas; Quitosana; Chitosan; Biopolymer.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1036253
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Bioconversion of cassava starch by-product into Bacillus and related bacteria polyhydroxyalkanoates Electron. J. Biotechnol.
Krueger,Cristhiane L; Radetski,Claudemir M; Bendia,Amanda G; Oliveira,Ida M; Castro-Silva,Marcus A; Rambo,Carlos R; Antonio,Regina V; Lima,André O.S..
Background: Unlike petroleum-based synthetic plastics, biodegradable biopolymer generation from industrial residue is a key strategy to reduce costs in the production process, as well as in the waste management, since efficient industrial wastewater treatment could be costly. In this context, the present work describes the prospection and use of bacterial strains capable to bioconvert cassava starch by-product into biodegradable polyhydroxyalkanoates (PHAs). Results: The first step of this study was the bacterial competence screening which was conducted with 72 strains covering 21 Bacillus and related species. The microorganism growth in a medium with a starch substrate was measured by an innovative MTT assay, while the ability of the bacteria to secrete...
Tipo: Journal article Palavras-chave: Bacillus megaterium; Biodegradable plastics; Biopolymer; MTT assay; Starch substrates.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300008
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Bioconversion of mixed free fatty acids to poly-3-hydroxyalkanoates by Pseudomonas putida BET001 and modeling of its fermentation in shake flasks Electron. J. Biotechnol.
Makhdum Munawar,Khalil Munawar; Simarani,Khanom; Annuar,Mohamad Suffian Mohamad.
Background: The paper reports on the utilization of palm kernel oil (PKO) as a low cost renewable substrate for medium-chain-length poly-3-hydroxyalkanoates (mcl-PHA) production by Pseudomonas putida BET001. Investigation on the effects of selected key variables on growth, mixed free fatty acids consumption and mcl-PHA production by the bacterial culture in the shaken flask system were carried out along with its kinetic modeling. Results: The biomass production, fatty acids consumption and mcl-PHA production were found favorable when the strain was cultured in mineral medium at pH 6-7,28°C, aeration surface-to-volume ratio of 0.4 x 10(6) m-1, 250 rpm agitation rate for 48 h. Mcl-PHA production by this strain showed mixed growth and non-growth associated...
Tipo: Journal article Palavras-chave: Biopolymer; Fermentation; Medium-chain-length PHA; Palm kernel oil; Pseudomonas putida.
Ano: 2016 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000100008
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Biodegradability kraft paper coated with films emulsified chitosan and palmitic acid. Repositório Alice
REIS, A. B.; YOSHIDA, C. M. P.; VILELA, E. S. D.; NASCIMENTO, R. dos S.; MELO, I. S. de; FRANCO, T. T..
Abstract: The use of natural polymers is an alternative to polymers derived from petroleum that may reduce industrial waste and contribute to the environmental protection. Following the same reasoning, the biodegradability of paper packaging is already known for it being a product originated from cellulosic materials (cellulosic fibers). The aim of this work was to assess the process of degradation from the junction of two different materials; biopolymer and sheets of paper. This paper proposes the study of the biodegradability of chitosan film-coated Kraft paper sheets and emulsified chitosan film-coated Kraft paper sheets added with palmitic acid, both in comparison with uncoated Kraft paper sheets. The biodegradability study was conducted based on...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Biopolymer; Kraft paper; Microbial biomass carbon; Soil respiration; Biofilm formation; Enzymatic activity; Biodegradação; Papel; Biofilme; Biodegradation; Chitosan.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/967553
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Biodegradable films of starch/PVOH/alginate in packaging systems for minimally processed lettuce (Lactuca sativa L.) Ciência e Agrotecnologia
Brandelero,Renata Paula Herrera; Brandelero,Evandro Martin; Almeida,Fábio Mendonça de.
ABSTRACT Biodegradable packaging may replace non-biodegradable materials when the shelf life of the packaged product is relatively short, as in minimally processed foods. The objective of this work was to evaluate the efficiency of biodegradable films comprising starch/polyvinyl alcohol (PVOH)/alginate with the addition of 0 or 0.5% of essential oil of copaiba (EOCP) or lemongrass (EOLM) compared to poly-vinyl chloride (PVC) films in the storage of minimally processed lettuce. Lettuce samples cut into 1-cm strips were placed in polypropylene trays wrapped with biodegradable films and stored at 6 ± 2 °C for 8 days. PVC films were used as controls. The biofilms presented 11.43-8.11 MPa resistance and 11.3-13.22% elongation, with water vapor permeability...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Active packaging; Biopolymer; Copaiba oil; Lemongrass oil.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000500510
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Biodegradation of a blended starch/natural rubber foam biopolymer and rubber gloves by Streptomyces coelicolor CH13 Electron. J. Biotechnol.
Watcharakul,Sirimaporn; Umsakul,Kamontam; Hodgson,Brian; Chumeka,Wannapa; Tanrattanakul,Varaporn.
Background: The growing problem of environmental pollution caused by synthetic plastics has led to the search for alternative materials such as biodegradable plastics. Of the biopolymers presently under development, starch/natural rubber is one promising alternative. Several species of bacteria and fungi are capable of degrading natural rubber and many can degrade starch. Results: Streptomyces coelicolor CH13 was isolated from soil according to its ability to produce translucent halos on a mineral salts medium, MSM, supplemented with natural rubber and to degrade starch. Scanning electron microscope studies showed that it colonized the surfaces of strips of a new starch/natural rubber biopolymer and rubber gloves and caused degradation by forming holes,...
Tipo: Journal article Palavras-chave: Biodegradation; Biopolymer; Natural rubber; Starch; Streptomyces coelicolor.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000100008
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Hydrophobic edible films made up of tomato cutin and pectin. Repositório Alice
MANRICH, A.; MOREIRA, F. K. V.; OTONI, C. G.; LOREVICE, M. V.; MARTINS, M. A.; MATTOSO, L. H. C..
bitstream/item/179096/1/P-17.0217-Hidrophobic-edible-films....pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Biopolymer; Edible film; Water resistance; Hydrophobicity.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1081776
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Industrial wastewater as raw material for exopolysaccharide production by Rhizobium leguminosarum BJM
Sellami,Mohamed; Oszako,Tomasz; Miled,Nabil; Ben Rebah,Faouzi.
The objective of this study was to evaluate the exopolysaccharide (EPS) production by Rhizobium leguminosarum cultivated in wastewater generated by oil companies (WWOC1 and WWOC2) and fish processing industry (WWFP). The results obtained in Erlenmeyer flasks indicated that the rhizobial strain grew well in industrial wastewater. Generally, wastewater composition affected the growth and the EPS production. WWFP allowed good bacterial growth similar to that obtained with the standard medium (YMB). During growth, various quantities of EPS were produced and yields varied depending on the media. Growing in YMB, EPS production did not exceed 9.7 g/L obtained after 72 h of growth. In wastewater, the maximum EPS value reached 11.1 g/L obtained with the fish...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Industrial wastewater; Biopolymer; Exopolysaccharide; Rhizobium.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000200407
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Interfacial bonding of Flax fibre/Poly(L-lactide) bio-composites ArchiMer
Le Duigou, Antoine; Davies, Peter; Baley, Christophe.
The use of glass fibre reinforced polyester composites raises many health and safety and environmental questions. One alternative is the development of high performance bio-based bio-composites with low environmental impact. Improved understanding of interfacial properties is essential to optimise the mechanical properties and durability of these materials, but so far few data are available. The present work describes the interfacial characterization of Flax fibre/Poly(lactic) acid (PLLA) system at the micro-scale using the microbond test. Different thermal treatments have been carried out (cooling rate and annealing) in order to evaluate the influence of matrix and interfacial morphologies as well as residual stress on interfacial properties....
Tipo: Text Palavras-chave: Flax fibre; Biopolymer; Biocomposite; Interfacial properties; Microbond test.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00000/11161/7808.pdf
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Mixed Cultures Fermentation for the Production of Poly-ß-hydroxybutyrate BABT
Shalin,Thomas; Sindhu,Raveendran; Binod,Parameswaran; Soccol,Carlos Ricardo; Pandey,Ashok.
Poly-ß-hydroxybutyrate (PHB) is a biodegradable intracellular microbial product produced by many bacteria and it is comparable to some of the petrochemical derived thermoplastics such as polypropylene. One of the main barriers for the commercial exploitation is the high cost of the substrate for the production of biopolymer. The utilization of mixed microbial cultures facilitates the use of complex substrates thereby reducing the cost of PHB production. In the present study, mixed culture systems were evaluated for PHB production. Bacillus firmus NII 0830 was used for the production of PHB since it accumulates a large amount of PHB and a second organism Lactobacillus delbrueckii NII 0925 was used to provide lactic acid. FTIR and 1H NMR analyses revealed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Poly-3-hydroxybutyrate; Biopolymer; Mixed culture; Bacillus firmus; Lactobacillus delbrueckii; Biodegradation.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000500644
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Molecular dynamics simulations of the minor ampullate spidroin modular amino acid sequence from Parawixia bistriatra: insights into silk tertiary structure and fibre formation. Repositório Alice
MURAD, A. M.; RECH FILHO, E. L..
bitstream/item/183373/1/Murad-Rech2011-Article-MolecularDynamicsSimulationsOf.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Biopolymer; Minor ampullate gland; Parawixia bistriata; Spider silk.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/901897
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Optimization of the extraction of carrageenan from Kappaphycus alvarezii using response surface methodology Ciênc. Tecnol. Aliment.
Webber,Vanessa; Carvalho,Sabrina Matos de; Ogliari,Paulo José; Hayashi,Leila; Barreto,Pedro Luiz Manique.
This study aims to optimize an alternative method of extraction of carrageenan without previous alkaline treatment and ethanol precipitation using Response Surface Methodology (RSM). In order to introduce an innovation in the isolation step, atomization drying was used reducing the time for obtaining dry carrageenan powder. The effects of extraction time and temperature on yield, gel strength, and viscosity were evaluated. Furthermore, the extracted material was submitted to structural analysis, by infrared spectroscopy and nuclear magnetic resonance spectroscopy (¹H-NMR), and chemical composition analysis. Results showed that the generated regression models adequately explained the data variation. Carrageenan yield and gel viscosity were influenced only...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Red algae; Biopolymer; Gelificant agent.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000400026
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Probiotics and their potential applications in active edible films and coatings. Repositório Alice
ESPITIA, P.J.P.; BATISTA, R.A.; AZEREDO, H. M. C. de; OTONI, C.G..
bitstream/item/151167/1/ART16077.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Probiotic; Active packaging; Antimicrobial activity; Biopolymer; Atividade antimicrobiana; Biopolímero; Conservação de alimentos; Embalagem de alimentos; Embalagens ativas; Probiótico; Food packaging; Food preservation.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1057037
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Recent advances on edible films based on fruits and vegetables - A review. Repositório Alice
OTONI, C. G.; AVENA-BUSTILLOS, R. J.; AZEREDO, H. M. C.; LOREVICE, M. V.; MOURA, M. R.; MATTOSO, L. H. C.; McHUGH, T. H..
bitstream/item/168407/1/P-Recent-advances-on-edible-....pdf
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Active packaging; Biodegradable material; Biopolymer; Food packaging; Multifunctional film.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1081765
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Seawater ageing of flax/poly(lactic acid) biocomposites ArchiMer
Le Duigou, A.; Davies, Peter; Baley, C..
Natural fibre reinforced biopolymer composites, or biocomposites, are an alternative to the glass fibre reinforced thermoset composites widely used today in marine applications. Biocomposites offer good mechanical properties and total biodegradability, but if they are to be adopted for marine structures their durability in a seawater environment must be demonstrated. In the present study unreinforced PLLA (Poly(L-Lactic acid)), injected and film stacked flax composites with the same PLLA matrix have been examined. All the samples were aged in natural seawater at different temperatures in order to accelerate hygrothermal ageing. Changes to physico-chemical and mechanical behaviour have been followed by weight measurements, thermal and gel permeation...
Tipo: Text Palavras-chave: Mechanical properties; Hygrothermal ageing; Biopolymer; Natural fibre; Composites.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6639.pdf
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Semi-scale production of PHAs from waste frying oil by Pseudomonas fluorescens S48 BJM
Gamal,Rawia F.; Abdelhady,Hemmat M.; Khodair,Taha A.; El-Tayeb,Tarek S.; Hassan,Enas A.; Aboutaleb,Khadiga A..
The present study aimed at developing a strategy to improve the volumetric production of PHAs by Pseudomonas fluorescens S48 using waste frying oil (WFO) as the sole carbon source. For this purpose, several cultivations were set up to steadily improve nutrients supply to attain high cell density and high biopolymer productivity. The production of PHAs was examined in a 14 L bioreactor as one-stage batch, two-stage batch, and high-cell-density fed-batch cultures. The highest value of polymer content in one-stage bioreactor was obtained after 60 h (33.7%). Whereas, the two-stage batch culture increased the polymer content to 50.1% after 54 h. High-cell-density (0.64 g/L) at continuous feeding rate 0.55 mL/l/h of WFO recorded the highest polymer content after...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pseudomonas fluorescens S48; Biopolymer; PHAs; Batch; Two-stage batch; High-celldensity fed batch; Bioreactor; Recovery.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000200034
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Synthesis and physicochemical characterization of chemically modified chitosan by succinic anhydride BABT
Mello,Karine Gargioni Pereira Correa de; Bernusso,Leandra de Cássia; Pitombo,Ronaldo Nogueira de Moraes; Polakiewicz,Bronislaw.
The N-succinil-chitosan is a chemically modified derivative of the biopolymer chitosan. The succinic anhydride attached to the free amino groups presented along the chitosan's polymer chain imparts to the molecule different physicochemical properties not exhibited before the modification. These chemical modifications enhance chitosan's solubility in slightly acid, neutral and alkaline media. These properties are related to the long alkyl chains attached to hydrophilic parts. In this case the hydrophilic part of D-glucosamine promotes stronger interactions with the water molecules, and consequently, enhances the solubility of the chitosan polymer. Non-modified free chitosan is soluble only in acidic medium (pH < 5.5). These modifications made possible...
Tipo: Info:eu-repo/semantics/article Palavras-chave: N-succinil-chitosan; Succinic anhydride; Biopolymer; Solubility.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000500017
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Xanthan gum production by Xanthomonas axonopodis pv. mangiferaeindicae from glycerin of biodiesel in different media and addition of glucose Biological Sciences
Gondim, Tayssa Santos; Pereira, Roberto Guimarães; Fiaux, Sorele Batista.
Biodiesel production has been increasing yearly in Brazil. A large amount of glycerin is generated in this process and needs a correct destination. One possible use of this glycerin in crude form is in biotechnological processes. Xanthan gum is a commercial gum used primarily in the pharmaceutical and food industries as thickener, emulsifier and stabilizer. It is synthetized by species of the bacterium Xanthomonas generally from glucose. However, current research shows that species of this bacterium have the capacity to grow and synthesize the gum using glycerin from biodiesel. The aim of this study was to produce xanthan gum using glycerin from biodiesel production in medium with different nitrogen content, named complex and simple media. The kinetics of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ciências biológicas; Bioprocessos residue; Biopolymer; Biotechnological process. Bioprocessos.
Ano: 2019 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/43661
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β-galactosidase Encapsulated in Carrageenan, Pectin and Carrageenan/Pectin: Comparative Study, Stability and Controlled Release Anais da ABC (AABC)
SILVA,RENATA CRISTINA; TREVISAN,MARCELLO G.; GARCIA,JERUSA SIMONE.
Abstract The present study investigated the encapsulation of β-galactosidase in carrageenan, pectin and its hybrid hydrogels by using the ionotropic gelation method. The material obtained was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG/DTG) and scanning electron microscopy (SEM). The effects of pH, temperature and storage time were evaluated in terms of the catalytic activity of the free and encapsulated enzyme. Addition studies were conducted evaluating the performance of catalytic activity in vitro conditions. Carrageenan, pectin and hybrid hydrogels presented encapsulation efficiency of 58 ± 1%, 72 ± 1% and 77 ± 2%, respectively. The pectin hydrogel showed the higher β-galactosidase activity in pH and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biopolymer; Encapsulation; Enzymatic activity; Ionotropic gelation; Lactase.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100905
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