Consulta: creatorFacets:"Maldonade,Iriani R."
Registros recuperados: 3
Data/hora: 10/06/2024 08:16:02

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

Statistical optimisation of cell growth and carotenoid production by Rhodotorula mucilaginosa
Provedor de dados: 58
Autores: Maldonade,Iriani R.; Rodriguez-Amaya,Delia B.; Scamparini,Adilma R. P.
Sequential statistical methods were used to maximise carotenoid production by a strain of Rhodotorula mucilaginosa, isolated from the Brazilian ecosystem. Initially, a factorial 2(5-1) experimental design was used, and the variables were pH and the levels of glucose, yeast extract, MgSO4.7H2O and KH2PO4. The nitrogen source (yeast extract) was the most important variable in enhancing carotenoid production; MgSO4.7H2O and KH2PO4 had a negative influence. The initial pH had no significant effect on carotenoid and cell productions. We further investigated the effects of glucose and yeast extract effects, using a second-order central composite design (CCD) to optimise carotenoid production, which was adequately approximated with a full quadratic equation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fermentation; Torulene; Yeast; Response surface design; Rhodotorula mucilaginosa.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000100012

Selection and characterization of carotenoid-producing yeasts from Campinas region, Brazil
Provedor de dados: 58
Autores: Maldonade,Iriani R.; Scamparini,Adilma R. P.; Rodriguez-Amaya,Délia B.
The objective of the present study was to select and identify yeasts from Brazil capable of producing carotenoids. Pigmented yeasts were isolated from soil, leaves, fruits, flowers and a processed product. The samples were incubated at 30ºC in Erlenmeyer flasks, containing YM broth. After 48 hours, they were inoculated in Petri dishes with YM agar, and incubated at 30ºC during 120 hours. The yeast colonies, which presented yellow to red coloration, were transferred to culture tubes containing YM agar, and incubated at 30ºC for 72 hours. Out of 242 samples, only five had yellow to red color at high intensity. These highly pigmented yeasts were re-isolated in Petri dishes with YM agar and then transferred to tubes with GPYM agar. Identification through...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pigmented yeasts; Identification; Rhodotorula; Carotenoid; Fermentation.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822007000100014