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Title: Immobilisation of fructosyltransferase from Aspergillus aculeatus on epoxy-activated Sepabeads EC for the synthesis of fructo-oligosaccharides
Authors: Ghazi, Iraj, Gómez de Segura, María Aránzazu, Fernández Arrojo, Lucía, Alcalde Galeote, Miguel, Yates Buxcey, Malcolm, Rojas-Cervantes, M. Luisa, Plou Gasca, Francisco José, Ballesteros, Antonio
Keywords: Prebiotics
β-Fructofuranosidase
Transfructosylase
Pectinex Ultra SP-L
Fructo-oligosaccharides
Immobilized enzymes
Biocatalysis
Polymethacrylate
Issue Date: Jun-2005
Publisher: Elsevier
Abstract: The transfructosylating activity present in two commercial pectinase preparations (Pectinex Ultra SP-L, from Aspergillus aculeatus, and Rapidase TF, from Aspergillus niger) was studied. Pectinex Ultra SP-L, which has a high transferase/hydrolase ratio, was covalently immobilised on a polymethacrylate-based polymer (Sepabeads® EC) activated with epoxy groups. The influence of pore volume and average pore size on biocatalyst performance was studied for two of these carriers (Sepabeads EC-EP3 and EC-EP5). Several parameters that affect immobilisation such as buffer concentration, pH and amount (mg) of protein added per gram of support (varied over the range 30:1 to 200:1) were analysed. We found that Pectinex Ultra SP-L can be efficiently immobilised on these supports without adding any external salt or buffer. Using Sepabeads EC-EP5 –whose pore volume (1.67 cm3/g) and pore size (800 nm) are higher than those corresponding to Sepabeads EC-EP3– the activity towards sucrose reached 25.9 U/g biocatalyst. The immobilised fructosyltransferase was applied to the batch synthesis of fructo-oligosaccharides (FOS) using 630 g/l sucrose to shift activity towards transfructosylation in detriment of hydrolysis. The FOS concentration reached a maximum value of 387 g/l after 36 h (240 g/l 1-kestose, 144 g/l nystose and 3 g/l 1(F)-fructofuranosyl-nystose), which corresponds to 61.5% (w/w) of the total carbohydrates in the mixture. The features of these immobilised biocatalysts are very attractive for their application in batch and fixed-bed bioreactors.
Description: 9 pages, 7 figures.-- Printed version published Aug 1, 2005.
Publisher version (URL): http://dx.doi.org/10.1016/j.molcatb.2005.04.013
URI: http://hdl.handle.net/10261/10873
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Citation: Journal of Molecular Catalysis B: Enzymatic Volume 35, Issues 1–3, 1 August 2005, Pages 19–27
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