Consulta: creatorFacets:"Jorge,João Atílio"
Registros recuperados: 7
Data/hora: 05/06/2024 17:59:47

Characterization of a thermostable extracellular tannase produced under submerged fermentation by Aspergillus ochraceus
Provedor de dados: 69
Autores: Gonçalves,Heloísa Bressan; Riul,Alana Jacomini; Quiapim,Andréa Carla; Jorge,João Atílio; Guimarães,Luis Henrique Souza.
Background: Tannases are enzymes that may be used in different industrial sectors as, for example, food and pharmaceutical. They are obtained mainly from microorganisms, as filamentous fungi. However, the diversity of fungi stays poorly explored for tannase production. In this article, Aspergillus ochraceus is presented as a new source of tannase with interesting features for biotechnological applications. Results: Extracellular tannase production was induced when the fungus was cultured in Khanna medium with tannic acid as carbon source. The extracellular tannase was purified 9-fold with 2% recovery and a single band corresponding to 85 kDa was observed in SDS-PAGE. The native apparent molecular mass was estimated as 112 kDa. Optima of temperature and pH...
Tipo: Journal article
Palavras-chave: Aspergillus ochraceus; Gallic acid; Tannase; Tannic acid; Tannin acyl hydrolase.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000500004

Characterization of a multi-tolerant tannin acyl hydrolase II from Aspergillus carbonarius produced under solid-state fermentation
Provedor de dados: 69
Autores: Valera,Larissa Serrani; Jorge,João Atílio; Guimarães,Luis Henrique Souza.
Background Tannases are enzymes with biotechnological potential produced mainly by microorganisms as filamentous fungi. In this context, the production and characterization of a multi-tolerant tannase from Aspergillus carbonarius is described. Results The filamentous fungus A. carbonarius produced high levels of tannase when cultivated under solid-state fermentation using green tea leaves as substrate/carbon source and tap water at a 1:1 ratio as the moisture agent for 72 h at 30°C. Two tannase activity peaks were obtained during the purification step using DEAE-Cellulose. The second peak (peak II) was purified 11-fold with 14% recovery from a Sepharose CL-6B chromatographic column. The tannase from peak II (tannase II) was characterized as a heterodimeric...
Tipo: Journal article
Palavras-chave: Aspergillus; Microbial enzymes; Solid-state fermentation; Tannase; Tannic acid.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600013

Biochemical properties of an extracellular &amp;#946;-D-fructofuranosidase II produced by Aspergillus phoenicis under Solid-Sate Fermentation using soy bran as substrate
Provedor de dados: 69
Autores: Rustiguel,Cynthia Barbosa; Oliveira,Arthur Henrique Cavalcanti de; Terenzi,Héctor Francisco; Jorge,João Atílio; Guimarães,Luis Henrique Souza.
The filamentous fungus A. phoenicis produced high levels of ?-D-fructofuranosidase (FFase) when grown for 72 hrs under Solid-State Fermentation (SSF), using soy bran moistened with tap water (1:0.5 w/v) as substrate/carbon source. Two isoforms (I and II) were obtained, and FFase II was purified 18-fold to apparent homogeneity with 14% recovery. The native molecular mass of the glycoprotein (12% of carbohydrate content) was 158.5 kDa with two subunits of 85 kDa estimated by SDS-PAGE. Optima of temperature and pH were 55Ã¯Â¿Â½C and 4.5. The enzyme was stable for more than 1 hr at 50Ã¯Â¿Â½C and was also stable in a pH range from 7.0 to 8.0. FFase II retained 80% of activity after storage at 4Ã¯Â¿Â½C by 200 hrs. Dichroism analysis showed the presence of random...
Tipo: Journal article
Palavras-chave: Agroindustrial substrate; Aspergillus; ?-D-fructofuranosidase; Solid state fermentation; Sucrose.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000200002

Biotechnological potential of alternative carbon sources for production of pectinases by Rhizopus microsporus var. rhizopodiformis
Provedor de dados: 52
Autores: Damásio,André Ricardo de Lima; Maller,Alexandre; Silva,Tony Márcio da; Jorge,João Atílio; Terenzi,Hector Francisco; Polizeli,Maria de Lourdes Teixeira de Moraes.
Fungi collected from Brazilian soil and decomposing plants were screened for pectinase production. R. microsporus var. rhizopodiformis was the best producer and was selected to evaluate the pectic enzyme production under several nutritional and environmental conditions. The pectinase production was studied at 40ºC, under 28 carbon sources-supplemented medium. The inducer effect of several agro-industrial residues such as sugar cane bagasse, wheat flour and corncob on polygalacturonase (PG) activity was 4-, 3- and 2-fold higher than the control (pectin). In glucose-medium, a constitutive pectin lyase (PL) activity was detected. The results demonstrated that R. microsporus produced high levels of PG (57.7 U/mg) and PL (88.6 U/mg) in lemon peel-medium. PG had...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agro industrial residues; Lemon peel; Pectin lyase; Polygalacturonase; R. microsporus var. rhizopodiformis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000100019

Screening of thermotolerant and thermophilic fungi aiming β-xylosidase and arabinanase production
Provedor de dados: 58
Autores: Benassi,Vivian Machado; Lucas,Rosymar Coutinho de; Jorge,João Atílio; Polizeli,Maria de Lourdes Teixeira de Moraes.
Plant cell wall is mainly composed by cellulose, hemicellulose and lignin. The heterogeneous structure and composition of the hemicellulose are key impediments to its depolymerization and subsequent use in fermentation processes. Thus, this study aimed to perform a screening of thermophilic and thermotolerant filamentous fungi collected from different regions of the São Paulo state, and analyze the production of β-xylosidase and arabinanase at different temperatures. These enzymes are important to cell wall degradation and synthesis of end products as xylose and arabinose, respectively, which are significant sugars to fermentation and ethanol production. A total of 12 fungal species were analyzed and 9 of them grew at 45 ºC, suggesting a thermophilic or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Screening; Β-D-xylosidase; Arabinanase; Thermotolerant; Thermophilic.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000400042

Production of thermostable invertases by Aspergillus caespitosus under submerged or solid state fermentation using agroindustrial residues as carbon source
Provedor de dados: 58
Autores: Alegre,Ana Cláudia Paiva; Polizeli,Maria de Lourdes Teixeira de Moraes; Terenzi,Héctor Francisco; Jorge,João Atílio; Guimarães,Luis Henrique Souza.
The filamentous fungus Aspergillus caespitosus was a good producer of intracellular and extracellular invertases under submerged (SbmF) or solid-state fermentation (SSF), using agroindustrial residues, such as wheat bran, as carbon source. The production of extracellular enzyme under SSF at 30ºC, for 72h, was enhanced using SR salt solution (1:1, w/v) to humidify the substrate. The extracellular activity under SSF using wheat bran was around 5.5-fold higher than that obtained in SbmF (Khanna medium) with the same carbon source. However, the production of enzyme with wheat bran plus oat meal was 2.2-fold higher than wheat bran isolated. The enzymatic production was affected by supplementation with nitrogen and phosphate sources. The addition of glucose in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aspergillus caespitosus; ²-D-fructofuranosidase; Invertase; Solid-state fermentation; Submerged fermentation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822009000300025

Thermostable saccharogenic amylase produced under submerged fermentation by filamentous fungus Penicillium purpurogenum
Provedor de dados: 58
Autores: Silva,Tony Márcio; Oliveira,Maurício de; Somera,Alexandre Favarin; Jorge,João Atílio; Terenzi,Héctor Francico; Polizeli,Maria de Lourdes T. M; Guimarães,Luis Henrique Souza.
The effect of several nutritional and environmental parameters on Penicillium purpurogenum growth and sacharogenic amylase production was analyzed. High enzyme levels (68.2 U mg-1) were obtained with Khanna medium at initial pH 6.0, incubated at 30ºC for 144 hours. The optimum pH and temperature activities were 5.0 and 65ºC, respectively. The enzyme presented a half-life (t50) of 60 min, at 65ºC. Only glucose was detected after 24 hours of reaction using soluble starch as substrate.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amylase; Penicillium purpurogenum; Submerged fermentation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000300035