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Registros recuperados: 47 | |
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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 <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<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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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ROSA,Luísa Ozorio Lopes da; SANTANA,Marcelo Cerutti; AVEZEDO,Tatiana Lima; BRÍGIDA,Ana Iraidy Santa; GODOY,Ronoel; PACHECO,Sidney; MELLINGER-SILVA,Caroline; CABRAL,Lourdes Maria Correa. |
Abstract Whey is well-known for the functional and bioactive properties of its proteins and peptides, which are of great interest to food and nutraceutical industries. The aim of this study was to investigate the effect of four different commercial proteases (Novo ProD® (NPD), Alcalase® (ALC), Pancreas Trypsin® (TRY), and Flavourzyme® (FLA)) in the generation of hydrolysates with emulsifying and antioxidant activities. Hydrolysis processes were carried out for 5 h, reaching maximum degrees of 18.5, 15.5, 9.2, and 8.7% for NPD, ALC, TRY, and FLA, respectively. All tested enzymes generated very diverse, but conservative peptide profiles when comparing the treatments along the time, with the main enzymatic actions up to 120 min-reaction. An increase in the... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Whey protein; Hydrolysis; Functionality; Emulsification; Antioxidant activity. |
Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612018000500031 |
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Márquez-López,Anahí; Ramírez-Conejo,Juan David; Chávez-Parga,Ma. Del Carmen; Flores,Dora Cecilia Valencia; Jaramillo,Miguel Angel Zamudio; Rodríguez,Horacio González; González-Hernández,Juan Carlos. |
Abstract Non-conventional yeasts represent an alternative for microorganisms that are capable to produce the enzyme Tannase (EC 3.1.1.20), which has many applications is the food and pharmaceutical industry as it stands out for its ability to produce ellagic acid out of the enzymatic hydrolysis of ellagitannins. Ellagic acid has been studied in the medical area for its action against various diseases, as is the case of cancer or heart problems. The investigation was conducted to evaluate seven non-conventional yeasts - Debaryomyces hansenii PYC ISA 1510, Debaryomyces hansenii PYC 2968, Candida parapsilosis, Candida utilis, Pichia pastoris, Pichia kluyveri, Issatchenkia terricola - as producers of the enzyme tannase. This was done in mediums of fermentation... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Non-conventional yeasts; Enzymatic activity; Tannase; Ellagic acid; Hydrolysis. |
Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612019005031111 |
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Registros recuperados: 47 | |
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