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

Troncoso, Eduardo; Castillo, Rosario; Valenzuela, Roberto; Reyes, Pablo; Freer, Juanita; Norambuena, Marcela; Rodríguez, Jaime; Parra, Carolina

dc.creator	Troncoso, Eduardo
dc.creator	Castillo, Rosario
dc.creator	Valenzuela, Roberto
dc.creator	Reyes, Pablo
dc.creator	Freer, Juanita
dc.creator	Norambuena, Marcela
dc.creator	Rodríguez, Jaime
dc.creator	Parra, Carolina
dc.date	2017-06-16
dc.date.accessioned	2019-11-13T15:11:35Z
dc.date.available	2019-11-13T15:11:35Z
dc.identifier	http://www.jcchems.com/index.php/JCCHEMS/article/view/183
dc.identifier.uri	https://revistaschilenas.uchile.cl/handle/2250/112592
dc.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.	en-US
dc.format	application/pdf
dc.language	eng
dc.publisher	Sociedad Chilena de Química	en-US
dc.relation	http://www.jcchems.com/index.php/JCCHEMS/article/view/183/145
dc.rights	Copyright (c) 2017 Eduardo Troncoso, Rosario Castillo, Roberto Valenzuela, Pablo Reyes, Juanita Freer, Marcela Norambuena, Jaime Rodríguez, Carolina Parra	en-US
dc.rights	https://creativecommons.org/licenses/by-nc-sa/4.0	en-US
dc.source	Journal of the Chilean Chemical Society; Vol 62 No 2 (2017): Journal of the Chilean Chemical Society	en-US
dc.source	0717-9707
dc.source	0717-9324
dc.subject	Enzymatic hydrolysis	en-US
dc.subject	Lignin micro-droplets	en-US
dc.subject	Organosolv	en-US
dc.subject	Kraft process	en-US
dc.subject	Steam explosión	en-US
dc.subject	Autohydrolysis	en-US
dc.subject	Eucalyptus globulus	en-US
dc.title	CHEMICAL AND MICROSTRUCTURAL CHANGES IN EUCALYPTUS GLOBULUS FIBERS SUBJECTED TO FOUR DIFFERENT PRETREATMENTS AND THEIR INFLUENCE ON THE ENZYMATIC HYDROLYSIS	en-US
dc.type	info:eu-repo/semantics/article
dc.type	info:eu-repo/semantics/publishedVersion

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