CHEMICAL AND MICROSTRUCTURAL CHANGES IN EUCALYPTUS GLOBULUS FIBERS SUBJECTED TO FOUR DIFFERENT PRETREATMENTS AND THEIR INFLUENCE ON THE ENZYMATIC HYDROLYSIS

In order to understand the relation between chemical composition, microscopic structure and enzymatic digestibility, different Eucalyptus globulus wood pretreated samples were examined. Pretreated materials obtained by steam explosion and autohydrolysis were compared with those obtained by organosol...

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Autores principales:	TRONCOSO,EDUARDO, CASTILLO,ROSARIO, VALENZUELA,ROBERTO, REYES,PABLO, FREER,JUANITA, NORAMBUENA,MARCELA, RODRÍGUEZ,JAIME, PARRA,CAROLINA
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2017
Materias:	Enzymatic hydrolysis lignin micro-droplets organosolv kraft process steam explosion autohydrolysis Eucalyptus globulus
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072017000200005
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spelling	oai:scielo:S0717-970720170002000052017-06-30CHEMICAL AND MICROSTRUCTURAL CHANGES IN EUCALYPTUS GLOBULUS FIBERS SUBJECTED TO FOUR DIFFERENT PRETREATMENTS AND THEIR INFLUENCE ON THE ENZYMATIC HYDROLYSISTRONCOSO,EDUARDOCASTILLO,ROSARIOVALENZUELA,ROBERTOREYES,PABLOFREER,JUANITANORAMBUENA,MARCELARODRÍGUEZ,JAIMEPARRA,CAROLINA Enzymatic hydrolysis lignin micro-droplets organosolv kraft process steam explosion autohydrolysis Eucalyptus globulus In order to understand the relation between chemical composition, microscopic structure and enzymatic digestibility, different Eucalyptus globulus wood pretreated samples were examined. Pretreated materials obtained by steam explosion and autohydrolysis were compared with those obtained by organosolv and kraft processes. Chemical analyses of pretreated materials showed a decrease in the content of xylans, except in the kraft pulp. FT-IR spectra showed that the residual lignin in autohydrolysis pulp had experienced greater changes compared to those in steam explosion and organosolv pulps, whereas minor changes in lignin kraft pulp were observed. The fiber morphology indicated that autohydrolysis pretreatment was the most aggressive treatment. Reduction in the content of lignin and its redistribution on the fiber wall were confirmed through confocal laser microscopy. The formation of discrete lignin droplets deposited on the surface of the fibers was observed in all pretreatments, with a higher frequency in organosolv followed by steam explosion. A significant increase in enzymatic accessibility was achieved in organosolv, autohydrolysis and steam explosion pulps, due to xylans removal combined with lignin redistribution. Homogeneous lignin distribution and higher xylan content may be related to the low enzymatic hydrolysis efficiency in kraft pulp.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.62 n.2 20172017-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072017000200005en10.4067/S0717-97072017000200005
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Enzymatic hydrolysis lignin micro-droplets organosolv kraft process steam explosion autohydrolysis Eucalyptus globulus
spellingShingle	Enzymatic hydrolysis lignin micro-droplets organosolv kraft process steam explosion autohydrolysis Eucalyptus globulus TRONCOSO,EDUARDO CASTILLO,ROSARIO VALENZUELA,ROBERTO REYES,PABLO FREER,JUANITA NORAMBUENA,MARCELA RODRÍGUEZ,JAIME PARRA,CAROLINA CHEMICAL AND MICROSTRUCTURAL CHANGES IN EUCALYPTUS GLOBULUS FIBERS SUBJECTED TO FOUR DIFFERENT PRETREATMENTS AND THEIR INFLUENCE ON THE ENZYMATIC HYDROLYSIS
description	In order to understand the relation between chemical composition, microscopic structure and enzymatic digestibility, different Eucalyptus globulus wood pretreated samples were examined. Pretreated materials obtained by steam explosion and autohydrolysis were compared with those obtained by organosolv and kraft processes. Chemical analyses of pretreated materials showed a decrease in the content of xylans, except in the kraft pulp. FT-IR spectra showed that the residual lignin in autohydrolysis pulp had experienced greater changes compared to those in steam explosion and organosolv pulps, whereas minor changes in lignin kraft pulp were observed. The fiber morphology indicated that autohydrolysis pretreatment was the most aggressive treatment. Reduction in the content of lignin and its redistribution on the fiber wall were confirmed through confocal laser microscopy. The formation of discrete lignin droplets deposited on the surface of the fibers was observed in all pretreatments, with a higher frequency in organosolv followed by steam explosion. A significant increase in enzymatic accessibility was achieved in organosolv, autohydrolysis and steam explosion pulps, due to xylans removal combined with lignin redistribution. Homogeneous lignin distribution and higher xylan content may be related to the low enzymatic hydrolysis efficiency in kraft pulp.
author	TRONCOSO,EDUARDO CASTILLO,ROSARIO VALENZUELA,ROBERTO REYES,PABLO FREER,JUANITA NORAMBUENA,MARCELA RODRÍGUEZ,JAIME PARRA,CAROLINA
author_facet	TRONCOSO,EDUARDO CASTILLO,ROSARIO VALENZUELA,ROBERTO REYES,PABLO FREER,JUANITA NORAMBUENA,MARCELA RODRÍGUEZ,JAIME PARRA,CAROLINA
author_sort	TRONCOSO,EDUARDO
title	CHEMICAL AND MICROSTRUCTURAL CHANGES IN EUCALYPTUS GLOBULUS FIBERS SUBJECTED TO FOUR DIFFERENT PRETREATMENTS AND THEIR INFLUENCE ON THE ENZYMATIC HYDROLYSIS
title_short	CHEMICAL AND MICROSTRUCTURAL CHANGES IN EUCALYPTUS GLOBULUS FIBERS SUBJECTED TO FOUR DIFFERENT PRETREATMENTS AND THEIR INFLUENCE ON THE ENZYMATIC HYDROLYSIS
title_full	CHEMICAL AND MICROSTRUCTURAL CHANGES IN EUCALYPTUS GLOBULUS FIBERS SUBJECTED TO FOUR DIFFERENT PRETREATMENTS AND THEIR INFLUENCE ON THE ENZYMATIC HYDROLYSIS
title_fullStr	CHEMICAL AND MICROSTRUCTURAL CHANGES IN EUCALYPTUS GLOBULUS FIBERS SUBJECTED TO FOUR DIFFERENT PRETREATMENTS AND THEIR INFLUENCE ON THE ENZYMATIC HYDROLYSIS
title_full_unstemmed	CHEMICAL AND MICROSTRUCTURAL CHANGES IN EUCALYPTUS GLOBULUS FIBERS SUBJECTED TO FOUR DIFFERENT PRETREATMENTS AND THEIR INFLUENCE ON THE ENZYMATIC HYDROLYSIS
title_sort	chemical and microstructural changes in eucalyptus globulus fibers subjected to four different pretreatments and their influence on the enzymatic hydrolysis
publisher	Sociedad Chilena de Química
publishDate	2017
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072017000200005
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_version_	1714200909748109312

CHEMICAL AND MICROSTRUCTURAL CHANGES IN EUCALYPTUS GLOBULUS FIBERS SUBJECTED TO FOUR DIFFERENT PRETREATMENTS AND THEIR INFLUENCE ON THE ENZYMATIC HYDROLYSIS

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