Production of lignocellulolytic enzymes by Aspergillus niger biofilms at variable water activities

Lignocellulolytic enzyme production by Aspergillus niger was compared both in submerged fermentation (SF) and biofilm fermentation (BF) at varying water activities. Maximal filter paper activity, endoglucanase and xylanase activities were much higher in BF (2.96, 4.7 and 4.61 IU ml-1, respectively)...

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Autores principales:	Villena,Gretty K, Gutiérrez-Correa,Marcel
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso 2007
Materias:	biofilm cellulase ethylene glycol water activity xylanase
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100012
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spelling	oai:scielo:S0717-345820070001000122007-08-14Production of lignocellulolytic enzymes by Aspergillus niger biofilms at variable water activitiesVillena,Gretty KGutiérrez-Correa,Marcel biofilm cellulase ethylene glycol water activity xylanase Lignocellulolytic enzyme production by Aspergillus niger was compared both in submerged fermentation (SF) and biofilm fermentation (BF) at varying water activities. Maximal filter paper activity, endoglucanase and xylanase activities were much higher in BF (2.96, 4.7 and 4.61 IU ml-1, respectively) than in SF cultures (1.71, 1.31 and 2.3 IU ml-1, respectively) but biomass yields were lower in BF than in SF (0.338 g g-1 and 0.431 g g-1, respectively). In the presence of 20% ethylene glycol (a w = 0.942) the enzyme activities decreased in both systems but BF still had higher levels (1.0, 1.0 and 2.6 IU ml-1, respectively) than SF cultures (0.6, 0.7 and 1.5 IU ml-1, respectively). An increase in xylanase specific activity of more than 2 fold (from 4.2 to 10.2 IU mg-1 biomass) was observed in the presence of 20% ethylene glycol, suggesting differential regulatory mechanisms in biofilm fermentation related to cell adhesion.info:eu-repo/semantics/openAccessPontificia Universidad Católica de ValparaísoElectronic Journal of Biotechnology v.10 n.1 20072007-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100012en10.4067/S0717-34582007000100012
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	biofilm cellulase ethylene glycol water activity xylanase
spellingShingle	biofilm cellulase ethylene glycol water activity xylanase Villena,Gretty K Gutiérrez-Correa,Marcel Production of lignocellulolytic enzymes by Aspergillus niger biofilms at variable water activities
description	Lignocellulolytic enzyme production by Aspergillus niger was compared both in submerged fermentation (SF) and biofilm fermentation (BF) at varying water activities. Maximal filter paper activity, endoglucanase and xylanase activities were much higher in BF (2.96, 4.7 and 4.61 IU ml-1, respectively) than in SF cultures (1.71, 1.31 and 2.3 IU ml-1, respectively) but biomass yields were lower in BF than in SF (0.338 g g-1 and 0.431 g g-1, respectively). In the presence of 20% ethylene glycol (a w = 0.942) the enzyme activities decreased in both systems but BF still had higher levels (1.0, 1.0 and 2.6 IU ml-1, respectively) than SF cultures (0.6, 0.7 and 1.5 IU ml-1, respectively). An increase in xylanase specific activity of more than 2 fold (from 4.2 to 10.2 IU mg-1 biomass) was observed in the presence of 20% ethylene glycol, suggesting differential regulatory mechanisms in biofilm fermentation related to cell adhesion.
author	Villena,Gretty K Gutiérrez-Correa,Marcel
author_facet	Villena,Gretty K Gutiérrez-Correa,Marcel
author_sort	Villena,Gretty K
title	Production of lignocellulolytic enzymes by Aspergillus niger biofilms at variable water activities
title_short	Production of lignocellulolytic enzymes by Aspergillus niger biofilms at variable water activities
title_full	Production of lignocellulolytic enzymes by Aspergillus niger biofilms at variable water activities
title_fullStr	Production of lignocellulolytic enzymes by Aspergillus niger biofilms at variable water activities
title_full_unstemmed	Production of lignocellulolytic enzymes by Aspergillus niger biofilms at variable water activities
title_sort	production of lignocellulolytic enzymes by aspergillus niger biofilms at variable water activities
publisher	Pontificia Universidad Católica de Valparaíso
publishDate	2007
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000100012
work_keys_str_mv	AT villenagrettyk productionoflignocellulolyticenzymesbyaspergillusnigerbiofilmsatvariablewateractivities AT gutierrezcorreamarcel productionoflignocellulolyticenzymesbyaspergillusnigerbiofilmsatvariablewateractivities
_version_	1718441763973103616

Production of lignocellulolytic enzymes by Aspergillus niger biofilms at variable water activities

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