Consulta: subjectFacets:"Hydrolysis"
Registros recuperados: 43
Data/hora: 03/06/2024 08:25:33

Treatment of low strength sewage with high suspended organic matter content in an anaerobic sequencing batch reactor and modeling application
Provedor de dados: 69
Autores: Donoso-Bravo,Andrés; Carballa,Marta; Ruiz- Filippi,Gonzalo; Chamy,Rolando.
In this work, an anaerobic sequencing batch reactor (ASBR) was operated for 8 months to treat low strength sewage with high suspended organic matter content. Three phases of operation with increasing organic loading rates (OLR) were performed: 0.4 kg COD/m³ x d (phase I), 0 .8 kg COD/m³ x d (phase II) and 1.2 kg COD/m³ x d (phase III). Adequate stability parameters (pH, total alkalinity) were obtained through all three experimental phases. During phases I and II, the removal efficiencies of organic matter (expressed as total chemical oxygen demand (COD) and total suspended solids ranged between 50-60%. However, these values decreased to 15-25% in phase III. In addition, a non-complex model, including hydrolysis, acidogenesis and methanogenesis, was applied...
Tipo: Journal article
Palavras-chave: Acidogenesis; Anaerobic treatment; Hydrolysis; Low strength wastewater; Modeling.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000300013

Consolidated briefing of biochemical ethanol production from lignocellulosic biomass
Provedor de dados: 69
Autores: Spyridon,Achinas; Willem Euverink,Gerrit Jan.
Bioethanol production is one pathway for crude oil reduction and environmental compliance. Bioethanol can be used as fuel with significant characteristics like high octane number, low cetane number and high heat of vaporization. Its main drawbacks are the corrosiveness, low flame luminosity, lower vapor pressure, miscibility with water, and toxicity to ecosystems. One crucial problem with bioethanol fuel is the availability of raw materials. The supply of feedstocks for bioethanol production can vary season to season and depends on geographic locations. Lignocellulosic biomass, such as forest-based woody materials, agricultural residues and municipal waste, is prominent feedstock for bioethanol cause of its high availability and low cost, even though the...
Tipo: Journal article
Palavras-chave: Bioconversion; Bioethanol; Fermentation; Hydrolysis; Renewable fuels.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500009

Enzymes: Bioprospecting of fungi that produce enzyme complexes.
Provedor de dados: 14
Autores: FAVARO, L. C. de L.
Elite strains of endophytic fungi, isolated from the Brazilian biodiversity, producers of efficient enzyme complexes for hydrolysis of the pre-treated sugarcane bagasse.
Tipo: Folders
Palavras-chave: Sugarcane bagasse; Enzymes; Fungi; Hydrolysis.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1133089

Lignocellulosic biomass: autohydrolysis pretreatment of lignocellulosic biomass.
Provedor de dados: 14
Autores: CARVALHO, F. B. de P.
A process of pretreatment and fractionation of lignocellulosic biomass by the use of water at high temperatures and pressures, to remove hemicellulose with little degradation of cellulose.
Tipo: Folders
Palavras-chave: Lignocellulosic; Sugarcane bagasse; Hydrolysis; Hemicellulose; Renewable resources.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1133096

Nanofibers: Production of cellulose nanofibers.
Provedor de dados: 14
Autores: VALADARES, L. F.
Technology for obtaining cellulose nanofibers from agro-industrial residues or pure cellulose sources by pretreatment and hydrolysis.
Tipo: Folders
Palavras-chave: Nanofibers; Cellulose; Hydrolysis.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1133077

Atividades lipolíticas em polpa e óleo de frutos de dendê.
Provedor de dados: 14
Autores: ROMERA, C. M.; SANTOS, C. F. dos; TURATI, D. F. M.; NAKAI, D. K.; JUNGMANN, L.; MENDES, T. D.; PACHECO, T. F.; RODRIGUES, D. de S.
Resumo: Um dos principais desafios da coleta e extração de óleo de frutos de dendê (palma de óleo) é a manutenção da qualidade do óleo, de forma a evitar a liberação de ácidos graxos, que mudam as propriedades do óleo e, consequentemente, reduzem seu valor comercial. A liberação desses ácidos é atribuída à ação de lipases. Entretanto, não há um consenso quanto à fonte das enzimas que hidrolisam excessivamente o óleo, se ela é endógena (produzida pelo próprio fruto de dendê) ou exógena (produzida por um determinado microrganismo que colonizou o fruto de dendê). Neste trabalho, a verificação da presença de lipases no mesocarpo de frutos de dendê foi realizada por meio de reações de hidrólise. Dessa maneira, as proteínas contidas no mesocarpo de dendê foram...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Frutos de dendê; Palma de óleo; Dendê; Ácido Graxo; Lípase; Hidrolise; Acidificação; Palm oils; Hydrolysis; Acidification; Fatty acids.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1132216

Malt bagasse: Alkaline pretreatment and enzymatic hydrolysis to release glucose from malt bagasse.
Provedor de dados: 14
Autores: RODRIGUES, D. de S.
Alkaline pretreatment process followed by enzymatic hydrolysis for release of glucose from malt bagasse. The alkaline pretreatment promotes biomass delignification, exposing the cellulose fibers, making them accessible to enzymatic action. A maximum conversion of cellulose into glucose (74%) was achieved when sodium hydroxide was used at a concentration of 4% (w/v).
Tipo: Folders
Palavras-chave: Alkaline pretreatment; Lignocellulosic; Malt; Bagasse; Glucose; Hydrolysis; Biomass; Renewable resources.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1133093

Description and modeling of polyurethane hydrolysis used as thermal insulation in oil offshore conditions
Provedor de dados: 5
Autores: Le Gac, Pierre-yves; Choqueuse, Dominique; Melot, D.
Polymers are widely used for passive thermal insulation coatings on steel pipe in offshore oil and gas production. In this industry, structures used in deep sea have to be reliable, as they are in service for more than 20 years in a very severe environment: sea water, hydrostatic pressure and temperature gradient. One of the main questions is how to test and predict the lifetime of such structures in the laboratory? This study presents one approach that has been developed to characterize and predict the degradation of polymers used as thermal insulation materials.  This paper is dedicated to polyurethane (polyether based) degradation in sea water at high temperature. Ageing has been performed in natural sea water under hydrostatic pressure at temperatures...
Tipo: Text
Palavras-chave: Polyurethane; Hydrolysis; Accelerated ageing; Sea water; Coating; Offshore.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00160/27132/25330.pdf

Impact of hydrolytic degradation on mechanical properties of PET - Towards an understanding of microplastics formation
Provedor de dados: 5
Autores: Arhant, Mael; Le Gall, Maelenn; Le Gac, Pierre Yves; Davies, Peter.
Ocean pollution by microplastics, i.e. small pieces of plastic of less than 5 mm, is one of the major concerns for the future of our planet. Secondary microplastics formation is due to fragmentation of macroplastic waste. This fragmentation can be attributed to environmental loadings such as waves, winds and tides, coupled with a change in mechanical properties of polymers induced by UV and seawater ageing. This study aims to characterize and understand changes in the mechanical behaviour of Polyethylene Terephthalate (PET) induced by hydrolysis, especially for high degradation levels. Thin films (200 microns) of PET were aged in water at temperatures from 110 °C to 80 °C for up to 150 days. Embrittlement occurs with chain scission during hydrolysis when...
Tipo: Text
Palavras-chave: Hydrolysis; Polyethylene terephthalate; Mechanical properties; Molar mass; Embrittlement; Microplastics.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00476/58794/61331.pdf

Influence of Finish Treatment on the Durability of Aramid Fibers Aged Under an Alkaline Environment
Provedor de dados: 5
Autores: Derombise, Guillaume; Van Schoors, Laetitia Vouyovitch; Messou, Marie-fleur; Davies, Peter.
Aramid fibers are high-performance materials which have been used in ropes and protective clothing for many years. They are also now being proposed in geo-textiles for ground reinforcement. The influence of the surface finish composition and content has been studied in the field of cables and textiles, but there is no published data concerning the effect of a finish treatment on the hydrolytic degradation. Aramid fibers with different finish contents have been aged in an alkaline environment. The degradation has been identified by FTIR, viscosimetry, TGA, SEM, and tensile tests. For Technora fibers, the presence of finish appears to limit the tensile strength loss of aramid fibers at pH 11 by limiting abrasion, as well as bulk and surface degradation. For...
Tipo: Text
Palavras-chave: Aramids; Fibers; Aging; Finish; Hydrolysis.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00006/11702/8987.pdf

Relations between bacterial extracellular enzyme activities and heterotrophic substrate uptake in a brackishwater environment.
Provedor de dados: 5
Autores: Hoppe, H.
Extracellular enzymes mediate the decomposition of polymeric organic compounds in natural waters. In many cases these enzymes comprise a component linked to the bacterial fraction of the aquatic community and react in close association with these cells. An annual survey of microbial activities in a brackish water fjord exhibited an excellent correlation between V sub(m) of proteases (ability to split the substrate analogue methylumbelliferyl-leucine) and V sub(m) as well as T sub(R) for leucine uptake by microorganisms. Hydrolysis rates (H sub(R)) for the decomposition of naturally occurring competitive substrate analogues of the model substrates (methylumbelliferyl-(MUF)-leucine, MUF- alpha -D-glucose, MUF-N-acetyl-glucosamine, MUF-phosphate) drastically...
Tipo: Text
Palavras-chave: Biogeochemistry; Fjords; Bacteria; Brackishwater environment; Seasonal variations; Dissolved organic matter; Interspecific relationships; Hydrolysis; Enzymes.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-952.pdf

Improvement of lipid and phospholipid recoveries from sardine (Sardina pilchardus) viscera using industrial proteases
Provedor de dados: 5
Autores: Dumay, Justine; Donnay-moreno, Claire; Barnathan, G; Jaouen, P; Berge, Jean-pascal.
Enzymatic hydrolysis of sardine viscera by three broad spectrum proteases was investigated using the pHstat method (24 h, pH 8, 50 degrees C). After hydrolysis, three fractions (sludge, aqueous phase and oily phase) were collected. For each fraction, lipids and phospholipids were quantified and molecular weights of aqueous phase peptides were determined. Under these conditions, the degree of hydrolysis (DH) varied from 1.9% (Flavourzyme), 3.1% (Protamex) and to 3.3% (Alcalase). Dry matter distribution indicated that all hydrolysis performed increased solubilisation of proteins: protein recovery for each hydrolysis ranged from 57.4% to 61.2%. Furthermore, the total lipid content in the liquid parts (oily and aqueous phases) increased (at least 85% of lipids...
Tipo: Text
Palavras-chave: Fish protein hydrolysate FPH; Sardine; By product; Lipid; Hydrolysis; Phospholipid.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2004.pdf

Life time prediction of polymer used as thermal insulation in offshore oil production conditions: Ageing on real structure and reliability of prediction
Provedor de dados: 5
Autores: Le Gac, Pierre-yves; Choqueuse, Dominique; Melot, D.; Melve, B.; Meniconi, L.
Polymers are widely used for passive thermal insulation coatings on steel pipe in offshore oil and gas production. In this industry, structures used in deep sea have to be reliable as they are in service for more than 20 years in a very severe environment: sea water, hydrostatic pressure, temperature. One of the main questions is how to test and predict the lifetime of such structures in the laboratory. This study presents one approach that has been developed to characterize and predict the degradation of polyurethanes used as thermal insulation materials.  Based on results obtained during accelerated ageing of the PU in sea water, a prediction of degradation through the thickness has been set up taking into account the temperature profile in the coating,...
Tipo: Text
Palavras-chave: Polyurethane; Life time prediction; Hydrolysis; Offshore; Thermal insulation; Durability.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00174/28572/26957.pdf

Polychloroprene behaviour in a marine environment: Role of silica fillers
Provedor de dados: 5
Autores: Tchalla, Siwavi Tatiana; Le Gac, Pierre-yves; Maurin, R.; Creac'Hcadec, R.
Polychloroprene rubbers are widely used in marine structures and often filled with silica in order to increase mechanical properties. The presence of silica fillers leads to a complex degradation of the material. This study aims to understand the deeper degradation mechanisms involved when a silica filled polychloroprene is used in sea water. To do so, 4 polychloroprene rubbers filled with different amounts of silica (from 0 to 45 phr) were aged in natural sea water for 6 months at temperatures ranging from 25 to 60 °C. Moreover, a natural rubber with similar formulation was also considered in order to evaluate the role of the chlorine atom in the degradation. . The chemistry and mechanics of the rubber degradation were also studied. In the presence of...
Tipo: Text
Palavras-chave: Polychloroprene; Seawater; Silica filler; Hydrolysis.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00376/48689/49020.pdf

Degradation of Technora aramid fibres in alkaline and neutral environments
Provedor de dados: 5
Autores: Derombise, Guillaume; Van Schoors, Laetitia Vouyovitch; Davies, Peter.
Technora fibres are high performance aramid fibres which have been used in ropes and protective clothing for many years. They are also now being proposed as geotextiles for soil reinforcement. However, there is a lack of experience on the long-term behaviour of Technora fibres in an alkaline environment (lime-treated ground.). Consequently, aging studies have been performed under different conditions (deionised water, pH9 and pH11). Hydrolytic degradation has been evaluated by FTIR, viscometry, TGA, density measurements, SEM, and by tensile measurements. Some chain degradation and finish rearrangements have been highlighted, but Technora fibres retain their mechanical properties for all the conditions considered here.
Tipo: Text
Palavras-chave: Aramids; Fibres; Technora; Hydrolysis; Long-term behaviour.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00002/11289/8052.pdf

Impact of fillers (short glass fibers and rubber) on the hydrolysis-induced embrittlement of polyamide 6.6
Provedor de dados: 5
Autores: Le Gac, Pierre Yves; Fayolle, Bruno.
This study deals with the durability of composites based on polyamide 6.6 (PA6.6) in a humid environment, and more especially, with the loss of fracture properties. It is known that PA6.6 undergoes plasticization in the presence of water, but hydrolysis also occurs. This hydrolysis leads to a sharp decline in fracture properties in resin. The aim of this study is thus to understand the behavior of two PA6.6-based composites, one containing short glass fibers and the other both glass fibers and a rubber. The results showed the transition from ductile to brittle behavior as a function of hydrolysis time in resin. For composites, the drop in elongation breaking with the macromolecular chain length was linear for all ageing conditions considered here without...
Tipo: Text
Palavras-chave: Polyamide 6.6; Hydrolysis; Fracture; Embrittlement; Reinforced plastics.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00450/56197/57755.pdf

De l'utilisation de protéases industrielles pour la production de sauces de poisson
Provedor de dados: 5
Autores: Le, Minh Chau.
Fish sauces are traditionally used in most Asian countries. Whatever the process, the principle is the same i.e. a fish autolysis in saline media followed by a fermentation step. Not less than 18 months are needed to obtain a brown liquid rich in salt and amino acids. This PhD work aims to determine if an addition of proteases can speed up the process while keeping the nutritional and sensorial properties. The first chapter presents the characteristics of fish sauces and the key parameters of the processes used. In the second chapter, several industrial proteases are compared each other for their capacity to liquefy the fishes in hyper saline conditions. Kinetics of proteolysis and biochemical characteristics of the resulting hydrolysates are established...
Tipo: Text
Palavras-chave: Sauce de poisson; Hydrolyse; Enzyme; Protéase; Sardine; Anchois; Fish sauce; Hydrolysis; Enzyme; Protease; Sardine; Anchovy.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00259/36997/35488.pdf

Hydrolytic kinetic model predicting embrittlement in thermoplastic elastomers
Provedor de dados: 5
Autores: Bardin, Antoine; Le Gac, Pierre Yves; Cérantola, Stéphane; Simon, Gaelle; Bindi, Hervé; Fayolle, B.
A hydrolytic kinetic model predicting chains scissions of a polyurethane elastomer (TPU) containing an anti-hydrolysis agent (stabilization via carbodiimide) was developed. This model is based on four components: uncatalysed hydrolysis, acid-catalysed hydrolysis, carboxylic acid dissociation and competitive carbodiimide-based deactivation of acid. Protons were considered as the key catalyst responsible for the hydrolysis. Model parameters were determined by fitting experimental data measured on unstabilized and stabilized TPUs, aged in immersion from 40 to 90 °C. Scission kinetics were predicted for immersion and 50% relative humidity conditions, from 10 to 100 °C. Structure-failure property relationships were also investigated, between molar mass and...
Tipo: Text
Palavras-chave: Thermoplastic elastomer; Hydrolysis; Kinetic model; Structure-property relationships.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00588/70044/67978.pdf

乳脂肪およびその分別物のリパーゼ分解
Provedor de dados: 19
Autores: 丹治, 幹男; 大西, 正男; 司城, 不二; Tanji, Mikio; Ohnishi, Masao; Tsukasaki, Fuji.
微生物起源の市販リパーゼを用いて、天然のバターフレーバーを強化する目的で乳脂肪を分解した。 1）市販酵素であるパラターゼAとリパーゼFを比較すると、 リパーゼFの方が分解率が高く、フレーバーも良好であった。 また、酵素添加量を増やすことにより短時間で分解率を上げることができた。 2）リパーゼFでバターオイルを分解した壌合、水相量の違い（10％と20％）、水道水の使用および水酸化物添加による加水分解率への影響はほとんどなかった。 3）リパーゼ分解により遊離した脂肪酸としては11種が検出され、そのうち主なものはパルミチン酸、ステアリン酸およびオレイン酸であった。24hと48hの分解時間で比較すると、遊離した脂肪酸量には違いがあったが、その組成はほとんど変わらなかった。またショートニング希釈およびマドレーヌでの実用試験においても、分解時間によるフレーバーの違いは単に強度的なものだけであった。 4）乳脂肪から分別された低融点画分を同様にリパーゼで分解すると、分解率はバターオイルの場合と比べて多少低かったが、遊離した短・中鎖の脂肪酸組成には差がなかった。官能試験では、刺激臭が弱くなり風味的にマイルドで、またマドレーヌでの実用試験にいでもフレーバー改善効果が認められた。しかし、これはバターフレーバー成分が分別の過程で低融点性画分に多く移行したことによると判断された。
Palavras-chave: バター; 乳脂肪; リパーゼ; 加水分解; フレーバー; Butter; Milk fat; Lipase; Hydrolysis; Flavor.
Ano: 2001
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1251

Changes in proximate composition and lipid quality of atherina atherina sp. during sun drying process
Provedor de dados: 20
Autores: Selmi, S.; Bouriga, N.; Faure, E.; Trabelsi, M.
Dans le présent travail, l’effet du séchage solaire sur la composition biochimique et la qualité des lipides des athérines a été étudié. La teneur en lipides, protéines et en cendres dans l’athérine a augmenté significativement (p &lt;0.05) après le séchage. Cependant, celle de l’humidité a montré une  forte diminution pour atteindre 22.37% dans le produit final. D’autre part, l’étude des indicateurs d’altération des lipides (Oxydation et Hydrolyse) nous a montré que la qualité des lipides des athérines est affectée par ce type de traitement. En effet, les taux des hydropéroxydes et des acides gras libres ont augmenté significativement (p &lt; 0.05) après le séchage pour atteindre respectivement 2.02 meq active O2/kg huile et 3.67%. La formation des...
Tipo: Journal Contribution
Palavras-chave: Biochemical composition; Dried products; Drying; Hydrolysis; Methodology; Oxidation; Processing fishery products; Quality assurance; Atherina; Http://aims.fao.org/aos/agrovoc/c_688.
Ano: 2008
URL: http://hdl.handle.net/1834/4152

Bebida saborizada elaborada con leche de soya parcialmente hidrolizada
Provedor de dados: 20
Autores: Ruiz, A.; Mejías, E.; González, J.; Silveira, I.; Cárdenas, M. E.; Padrón, X.
Mediante la acción de la papaína se puede obtener un hidrolizado parcial de la leche de soya en la que se superan algunas deficiencias organolépticas inherentes al frijol de soya o al proceso de obtención de la misma, aún así para su consumo debe ofrecerse bajo la forma de una bebida saborizada. Para formular dicha bebida se emplearon cuatro saborizantes: cocoa micropulverizada (CHC), sabor chocolate microencapsulado en polvo (CHP), sabor chocolate líquido (CHL) y sabor café microencapsulado en polvo (SCP); como endulzantes se emplearon azúcar, aspartame y una mezcla 50 % de aspartame + acesulfame. Se tomaron como variables independientes la cantidad de saborizantes y la de edulcorantes que se combinaron según sendos planes factoriales 22  con punto...
Tipo: Journal Contribution
Palavras-chave: Hydrolysis; Food processing; Palatability.
Ano: 2008
URL: http://hdl.handle.net/1834/4703

Variations de la composition biochimique et de la qualité des lipides des Athérines &lt;Atherina&gt; sp. au cours du séchage solaire
Provedor de dados: 20
Autores: Bouriga, N.; Selmi, S.; Faure, E.; Trabelsi, M.
Dans le présent travail, l’effet du séchage solaire sur la composition biochimique et la qualité des lipides des athérines a été étudié. La teneur en lipides, protéines et en cendres dans l’athérine a augmenté significativement (p &lt;0.05) après le séchage. Cependant, celle de l’humidité a montré une  forte diminution pour atteindre 22.37% dans le produit final. D’autre part, l’étude des indicateurs d’altération des lipides (Oxydation et Hydrolyse) nous a montré que la qualité des lipides des athérines est affectée par ce type de traitement. En effet, les taux des hydropéroxydes et des acides gras libres ont augmenté significativement (p &lt; 0.05) après le séchage pour atteindre respectivement 2.02 meq active O2/kg huile et 3.67%. La formation des...
Tipo: Journal Contribution
Palavras-chave: Biochemical composition; Dried products; Drying; Hydrolysis; Methodology; Processing fishery products; Quality assurance; Hydrolysis; Dried products; Drying; Methodology; Quality assurance; Http://aims.fao.org/aos/agrovoc/c_24940; Http://aims.fao.org/aos/agrovoc/c_15740; Http://aims.fao.org/aos/agrovoc/c_2402; Http://aims.fao.org/aos/agrovoc/c_12522; Http://aims.fao.org/aos/agrovoc/c_35287.
Ano: 2008
URL: http://hdl.handle.net/1834/3783

Xylose production from sugarcane bagasse by surface response methodology
Provedor de dados: 91
Autores: Paiva,José E. de; Maldonade,Iriani R.; Scamparini,Adilma R. P.
The aim of this study was to optimize the production of xylose from sugarcane bagasse. The hydrolysis process was carried out to evaluate the effect of temperature and sulphuric acid concentration on the xylose production at 18, 30, and 50 min of hydrolysis. A Central Composite Rotatable Design (CCRD) was used to study two process variables, temperature (111.5; 114.0; 120.0; 126.0 and 128.5 ºC) and sulphuric acid concentration (0.20; 0.70; 1.90; 3.10 and 3.60% v v-1). Sulphuric acid had a greater influence on the hydrolysis process than temperature. At concentrations of sulphuric acid higher than 3.10% (v v-1), raising temperature had little influence on the yield of xylose production. The best condition to obtain xylose (266.73 mg g-1 of dry bagasse) was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hemicellulose; Hydrolysis; HPLC; Aldopentose; Renewable carbon source.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662009000100011

Protein in rice flour and its role on rice starch hydrolysis
Provedor de dados: 106
Autores: Wansuksri, R.; Chotineeranat, S.; Chollakup, R.; Piyachowman, K.; Sriroth, K.
Palavras-chave: Hydrolysis; Rice; Starch; Protein.
Ano: 1999
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/4826

Effect of ultrasonication of Switchgrass on fermentable sugar production and biomass physical structure
Provedor de dados: 111
Autores: Sharma, Rajat; Sharma-Shivappa, Ratna R.; Boyette, Michael D.; Stikeleather, Larry F.
Pretreatment of lignocellulosic biomass for enhancing sugar yields has been studied extensively over the years.  Conventional methods employed to preprocess biomass to make it conducive for enzymatic hydrolysis have been hampered by issues like poor energy efficiency and production of undesirable by-products.  Ultrasonication, which involves the treatment of biomass through ultrasonic sound waves in a liquid medium without additional chemicals, is believed to have potential for biomass pretreatment.  In this study the effects of ultrasonication on switchgrass, a potential feedstock for bioethanol production due to its high cellulosic content, were investigated.  Results of compositional analysis and scanning electron microscopy conducted to visualize...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Panicum virgatum; Amplitude; Pretreatment; Hydrolysis; Scanning electron microscopy.
Ano: 2013
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2549

Chemical composition and dry matter digestibility of sugar cane oxide treated with calcium
Provedor de dados: 45
Autores: Romão,C.O.; Carvalho,G.G.P.; Leite,V.M.; Santos,A.S.; Chagas,D.M.T.; Ribeiro,O.L.; Oliveira,P.A.; Magalhães,A.F.; Pires,A.J.V.
The aim of this study was to identify the most adequate level of calcium oxide (CaO) in the treatment of sugar cane by evaluating the chemical composition and in vitro digestibility of dry matter. The sugar cane was homogenized with CaO levels 0, 0.75, 1.5, 2.25, 3.0, 3.75 and 4.5%, in natura matter, for 24 hours. The dry matter and mineral matter increased, while the organic matter of the sugar cane decreased (P &lt;0.05) linearly as a result of the CaO levels. The CaO had no effect on the levels of crude protein and ether extract. The phosphorus concentration remained unchanged, but there was a significant increase (P&lt;0.05) in the calcium content. The contents of neutral detergent fiber, acid detergent fiber and cellulose decreased linearly with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Additive; Forage; Hydrolysis; Saccharum; Alkaline treatment.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352014000200029

Anaerobic biodegradability of dairy wastewater pretreated with porcine pancreas lipase
Provedor de dados: 52
Autores: Mendes,Adriano Aguiar; Pereira,Ernandes Benedito; Furigo Jr.,Agenor; Castro,Heizir Ferreira de.
Lipids-rich wastewater was partial hydrolyzed with porcine pancreas lipase and the efficiency of the enzymatic pretreatment was verified by the comparative biodegradability tests (crude and treated wastewater). Alternatively, simultaneous run was carried out in which hydrolysis and digestion was performed in the same reactor. Wastewater from dairy industries and low cost lipase preparation at two concentrations (0.05 and 0.5% w.v-1) were used. All the samples pretreated with enzyme showed a positive effect on organic matter removal (Chemical Oxygen Demand-COD) and formation of methane. The best results were obtained when hydrolysis and biodegradation were performed simultaneously, attaining high COD and color removal independent of the lipase...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodegradability; Hydrolysis; Lipases; Lipids-rich wastewater and biogas.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000600003

Acid and enzymatic hydrolysis to recover reducing sugars from cassava bagasse: an economic study
Provedor de dados: 52
Autores: Woiciechowski,Adenise Lorenci; Nitsche,Saul; Pandey,Ashok; Soccol,Carlos Ricardo.
The objective of this work was to study the acid and enzymatic hydrolysis of cassava bagasse for the recovery of reducing sugars and to establish the operational costs. A statistical program "Statistica", based on the surface response was used to optimize the recovery of reducing sugars in both the processes. The process economics was determined considering the values of reducing sugars obtained at laboratory scale, and the operations costs of a cylindrical reactor of 1500 L, with flat walls at the top and bottom. The reactor was operated with 150 kg of cassava bagasse and 1350 kg of water. The yield of the acid hydrolysis was 62.4 g of reducing sugars from 100 g of cassava bagasse containing 66% starch. It represented 94.5% of reducing sugar recovery. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cassava bagasse; Hydrolysis; Acid; Enzyme; Reducing sugars; Economics.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000300018

Extracellular amylase production of a thermotolerant Fusarium sp: isolated from Eastern Nigerian soil
Provedor de dados: 52
Autores: Nwagu,Tochukwu Nwamaka; Okolo,Bartholomew Ndubuisi.
In this work, an α- amylase producing Fusarium sp. was isolated from the soil at 50 0C. Growth and enzyme production occurred at 30, 45 and 55 ºC. Soybean meal at 1% concentration, supplemented with 0.2% NH4Cl and 2.5% corn starch elicited the highest amylase yield. Optimum pH for the enzyme was pH 6.5 which retained over 60% of its activity after 24 h incubation at the pH range of 4.5-7.0. The enzyme showed high activity from 40-70 0C with optimal activity at 50 ºC and 78% activity was retained after incubation at 70 ºC for 30min. Catalytic function of the crude amylase was stimulated by Mg (136%), Ca (118%) and Zn (118%) at 2mM concentrations. The enzyme hydrolyzed cassava, potato and yam starches effectively.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrolysis; Starch; Fungal growth; Amylase synthesis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000400002

Hydrolysis of insoluble fish protein residue from whitemouth croaker (Micropogonias furnieri) by fungi
Provedor de dados: 52
Autores: Martins,Vilásia Guimarães; Palezi,Simone Canabarro; Costa,Jorge Alberto Vieira; Prentice,Carlos.
A significant amount of insoluble fibrous protein, in the form of feather, hair, scales, skin and others are available as co-products of agro industrial processing. These wastes are rich in keratin and collagen. This study evaluated different fungi for the hydrolysis of insoluble fish protein residues. Proteins resulting from Micropogonias furnieri wastes through pH-shifting process were dried and milled for fermentation for 96 h. This resulted the production of keratinolytic enzymes in the medium. Trichoderma sp. on alkaline substrate (28.99 U mL-1) and Penicillium sp. on acidic substrate (31.20 U mL-1) showed the highest proteolytic activities. Penicillium sp. showed the largest free amino acid solubilization (0.146 mg mL-1) and Fusarium sp. the highest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish waste; Fungi; Fibrous proteins; Hydrolysis; Whitemouth croaker.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000100014

Thermoanalytical and starch content evaluation of cassava bagasse as agro-industrial residue
Provedor de dados: 52
Autores: Lacerda,Luiz Gustavo; Almeida,Rafael Ramires; Demiate,Ivo Mottin; Carvalho Filho,Marco Aurélio Silva; Vasconcelos,Eliane Carvalho; Woiciechowski,Adenise Lorenci; Bannach,Gilbert; Schnitzler,Egon; Soccol,Carlos Ricardo.
Starch nutritional fractions as well as thermal properties and other analysis are essential for food and industrial application. Cassava bagasse is an important agro-industrial residue and its starch content was evaluated using two alternative methods. Thermal characterization and microscopy analyses helped to understand how hydrolysis digests starchy fraction of cassava bagasse. The melting point of cassava starch occurred at 169.2ºC. Regarding TG analyses, after moisture content, there were observed two main mass losses for all samples. Results suggest hydrolysis carried out using enzyme is less effective in order to convert total starch content in cassava bagasse. However, using sulfuric acid, fibers are affected by analyses conditions.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amylase; Cassava; Hydrolysis; Thermal analysis.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000700019

Bioethanol from Microalgal Biomass: A Promising Approach in Biorefinery
Provedor de dados: 52
Autores: Silva,Carlos Eduardo de Farias; Bertucco,Alberto.
Abstract The development of new technologies which increase the production of biofuel without directly compete with food production is required. Microalgal biomass has recently been in the highlight. The role of this biomass is here discussed within the concept of biorefinery and industrial sustainability of bioethanol production. The process of cultivation in order to accumulate around 50% of carbohydrates in the biomass (dry weight) and the importance of water and nutrient recycling are reviewed. Saccharification of biomass using enzymes or acids and alternative processes such as hydrothermal liquefaction and flash hydrolysis are addressed. Since the main monosaccharide in microalgal biomass is glucose, high rates of hydrolysis and fermentation were,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ethanol; Microalgae; Biofuel; Hydrolysis; Nutrient recycle.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100602

Enzymatic hydrolysis of sugarcane bagasse pretreated with acid or alkali
Provedor de dados: 52
Autores: Pietrobon,Vivian Cristina; Monteiro,Regina Teresa Rosim; Pompeu,Georgia Bertoni; Borges,Eduardo Poggi e; Lopes,Mario Lucio; Amorim,Henrique Vianna de; Cruz,Sandra Helena da; Viégas,Ellen Karine Diniz.
The aim of this study was to evaluate the performance of enzymatic hydrolysis of acid or alkali pretreated sugarcane bagasse for the production of fermentable sugars. The first step consisted of selection of commercial enzymes presenting the highest cellulolytic activities. After selection of four enzymes: HPL, CL, P1 and P4, their performances were tested in the bagasse pretreated with acid and alkali. The sugar content of the hydrolysates was analyzed by anion exchange liquid chromatography. Data showed that the joint action of 0.5% acid pretreatment, 121ºC, 30 minutes and enzyme CL provides the best results, 67.25 g of hexose and 148.13g of pentose per kg of dry bagasse.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bagasse sugarcane; Hydrolysis; Cellulolytic enzymes; HPAEC.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000200002

Thermal characterization of partially hydrolyzed cassava (Manihot esculenta) starch granules
Provedor de dados: 52
Autores: Lacerda,Luiz Gustavo; Azevedo,Jayme Augusto Menegassi; Carvalho Filho,Marco Aurélio da Silva; Demiate,Ivo Mottin; Schnitzler,Egon; Vandenberghe,Luciana Porto de Souza; Soccol,Carlos Ricardo.
Cassava starch, partially hydrolyzed by fungal á-amylase, was characterized using thermal analysis, light microscopy and X-ray diffraction. Thermal degradation was initiated at lower degradation temperatures after enzymatic treatment and the DSC (Differential scanning calorimetry) analysis showed almost similar range of gelatinization temperature, but the enthalpies of gelatinization were quite increased for the partially hydrolyzed starch granules. The results suggested that the partial degradation of the starch granules was concentrated in the amorphous regions.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amylase; Cassava; Hydrolysis; Thermal analysis.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000600016

Effect on the enzymatic hydrolysis of lipids from dairy wastewater by replacing Gum Arabic emulsifier for sodium chloride
Provedor de dados: 52
Autores: Mendes,Adriano Aguiar; Castro,Heizir Ferreira de.
The objective of this work was to evaluate the replacement of Gum Arabic for sodium chloride to reduce fat and organic contents in dairy wastewater using two low cost commercially available lipase preparations from animal source (Kin Master - LKM and Nuclear- LNU). The best performance was achieved when lipase Nuclear (LNU) was used as catalyst. In addition, this lipase preparation has also lower cost, which makes its use a quite promising technique for reduction of suspended solids as proteins and lipids contents found in wastewater generated by dairy industries.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lipases; Hydrolysis; Emulsifier; Biodegradability.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000400017

Hydrolysis of whey lactose by immobilized β-Galactosidase
Provedor de dados: 52
Autores: Mariotti,Marcela Panaro; Yamanaka,Hideko; Araujo,Angela Regina; Trevisan,Henrique Celso.
Hydrolysis of whey lactose to glucose and galactose by immobilized galactosidase comes as an alternative to enlarge the possibilities of commercial use of this feedstock. To be applied at industrial scale, the process should be performed continuously .This work aimed to study the hydrolysis of whey lactose by an immobilized enzyme reactor. b-Galactosidase from Aspergillus oryzae was immobilized on silica and activity and stability were evaluated. The best immobilization results were attained by using glutaraldehyde as support's activator and enzyme stabilizer. The optimized enzyme proportion for immobilization was 15-20 mg g-1 of support. Treatments of whey were performed (microfiltration, thermal treatment and ultrafiltration), seeking the elimination of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Β-galactosidase; Immobilization; Lactase; Whey; Lactose; Hydrolysis.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000600019

Effect of intraperitoneally administered hydrolyzed whey protein on blood pressure and renal sodium handling in awake spontaneously hypertensive rats
Provedor de dados: 56
Autores: Costa,E.L.; Almeida,A.R.; Netto,F.M.; Gontijo,J.A.R.
The present study evaluated the acute effect of the intraperitoneal (ip) administration of a whey protein hydrolysate (WPH) on systolic arterial blood pressure (SBP) and renal sodium handling by conscious spontaneously hypertensive rats (SHR). The ip administration of WPH in a volume of 1 ml dose-dependently lowered the SBP in SHR 2 h after administration at doses of 0.5 g/kg (0.15 M NaCl: 188.5 ± 9.3 mmHg vs WPH: 176.6 ± 4.9 mmHg, N = 8, P = 0.001) and 1.0 g/kg (0.15 M NaCl: 188.5 ± 9.3 mmHg vs WPH: 163.8 ± 5.9 mmHg, N = 8, P = 0.0018). Creatinine clearance decreased significantly (P = 0.0084) in the WPH-treated group (326 ± 67 µL min-1 100 g body weight-1) compared to 0.15 M NaCl-treated (890 ± 26 µL min-1 100 g body weight-1) and captopril-treated (903...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arterial blood pressure; Hydrolysis; Renal function; Urinary sodium excretion; Whey protein isolate.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005001200010

Alkali pretreated of wheat straw and its enzymatic hydrolysis
Provedor de dados: 58
Autores: Han,Lirong; Feng,Juntao; Zhang,Shuangxi; Ma,Zhiqing; Wang,Yonghong; Zhang,Xing.
The efficiency of enzymatic hydrolysis of cellulose can be improved by various pretreatments of the substrate. In order to increase the efficiency of enzymatic saccharification of the wheat straw, we determined the effect of different pretreatments on the physical structure, chemical components and enzymatic saccharification of wheat straw. Our results showed that combination of grinding and sodium hydroxide (NaOH) treatment had high effect on the enzymatic hydrolysis of wheat straws. The optimal pretreatment condition was to grind the wheat straws into the sizes of 120 meshes followed by treatment with 1.0% NaOH for 1.5 h (121°C/15psi). Under this condition, the cellulose content of wheat straw was increased by 44.52%, while the content of hemicellulose...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cellulase; Cellulose; Fermentation; Hydrolysis; Lignocellulosic; Pretreatment.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000100006

The hydrolysis of agro-industrial residues by holocellulose-degrading enzymes
Provedor de dados: 58
Autores: Moreira,Leonora Rios de Souza; Ferreira,Gaspar Virgilio; Santos,Sheila Sousa Thurler; Ribeiro,Ana Paula Souza; Siqueira,Félix Gonçalves; Ferreira Filho,Edivaldo Ximenes.
Holocellulose structures from agro-industrial residues rely on main and side chain attacking enzymes with different specificities for complete hydrolysis. Combinations of crude enzymatic extracts from different fungal species, including Aspergillus terreus, Aspergillus oryzae, Aspergillus niger and Trichoderma longibrachiatum, were applied to sugar cane bagasse, banana stem and dirty cotton residue to investigate the hydrolysis of holocellulose structures. A. terreus and A. oryzae were the best producers of FPase and xylanase activities. A combination of A. terreus and A. oryzae extracts in a 50% proportion provided optimal hydrolysis of dirty cotton residue and banana stem. For the hydrolysis of sugar cane bagasse, the best results were obtained with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural waste; Enzymatic mixtures; Hydrolysis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000200010

Novel agents for enzymatic and fungal hydrolysis of stevioside
Provedor de dados: 58
Autores: Milagre,H.M.S.; Martins,L.R.; Takahashi,J.A.
A comparative study on the potential of some biological agents to perform the hydrolysis of stevioside was carried out, aiming at establishing an alternative methodology to achieve the aglycon steviol or its rearranged derivative isosteviol, in high yields to be used in the preparation of novel bioactive compounds. Hydrolysis reactions were performed by using filamentous fungi (Aspergillus niger, Rhizopus stolonifer and Rhizopus arrhizus), a yeast (Saccharomyces cerevisiae)andenzymes (pancreatin and lipases PL250 and VFL 8000). Pancreatin showed the best hydrolytic activity, furnishing isosteviol at 93.9% of yield, at pH 4.0, using toluene as a co-solvent. Steviol was produced using both pancreatin at pH 7.0 (20.2% yield) and A. niger at pH 7 (20.8% yield).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stevioside; Hydrolysis; Aspergillus niger; Lipase; Pancreatin.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822009000200029

Multi-enzyme complex of white rot fungi in saccharification of lignocellulosic material
Provedor de dados: 58
Autores: Cardoso,Wilton Soares; Queiroz,Paula Viana; Tavares,Gabriella Peterlini; Santos,Fernando Almeida; Soares,Filippe Elias de Freitas; Kasuya,Maria Catarina Megumi; Queiroz,José Humberto de.
ABSTRACT The multi-enzyme complex (crude extract) of white rot fungi Pleurotus ostreatus, Pleurotus eryngii, Trametes versicolor, Pycnosporus sanguineus and Phanerochaete chrysosporium were characterized, evaluated in the hydrolysis of pretreated pulps of sorghum straw and compared efficiency with commercial enzyme. Most fungi complexes had better hydrolysis rates compared with purified commercial enzyme.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Enzymes; Cellulases; Fungus; Hydrolysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000400879

Productive performance of dairy cows fed with hydrolyzed sugarcane
Provedor de dados: 65
Autores: Teixeira Junior,Donizeti; Missio,Regis Luis; Sforcini,Mariana Paula Rossi; Oliveira,Mauro Dal Secco de; Ferrari,Viviane Borba; Santos,Rafael Ferreira.
This study aimed to evaluate the productive performance of dairy cows fed with sugarcane treated with 5g kg-1 of calcium oxide (CaO) or hydroxide [Ca(OH)2]. Eight Holstein cows with 638.01±12.52kg of body weight and milk yield of 20.32±1.5kg d-1 were randomly assigned into two 4x4 Latin squares, fed with the following diets composed of corn silage (CS), fresh sugarcane (FS), sugarcane treated with calcium oxide (STCO) or calcium hydroxide (STCH) as only forage. Data collection lasted five days, after 15 days of adaptation to diets and facilities. The dry matter intake (% of body weight) was higher in diets with CS (3.08) compared to those with FS (2.67), STCO (2.73) or STCH (2.73), which did not differ. Diets with CS determined milk production adjusted for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrated lime; Hydrolysis; Milk fat; Nutrient intake; Quicklime.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015001001848

Influence of lipid extraction from different protein sources on in vitro digestibility
Provedor de dados: 64
Autores: Sant'Ana,Rita de Cássia Oliveira; Mendes,Fabrícia Queiroz; Pires,Christiano Vieira; Oliveira,Maria Goreti de Almeida.
Proteins are the most abundant macromolecules in living cells and their primary role in the diet is to supply the body with essential amino acids in adequate quantities for the synthesis and maintenance of body tissues. The determination of protein digestibility of foods is an important factor to estimate their quality and the in vitro methodology is a fast and easy way to perform it. This study aimed to determine the influence of lipids on the in vitro digestibility of animal and vegetable proteins. The following protein sources: oat, beef, chicken, fish and pork meats, red beans, milk powder, textured soy protein (TSP), quinoa and five soybean varieties were evaluated. Animal proteins presented higher in vitro values than vegetable proteins, except for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Protein; Quality; Hydrolysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542011000400015