Hydrothermal treatments of walnut shells: a potential pretreatment for subsequent product obtaining

Walnuts are nowadays widely consumed. Since the edible part of walnuts does not account more than 50-60% of their total weight, the total amount of shells produced annually is huge. However, as walnut shells are part of lignocellulosic biomass, they could be valorised via a biorefinery approach in o...

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Detalles Bibliográficos
Autores: Morales Matías, Amaia, Labidi Bouchrika, Jalel, Gullón Estévez, Patricia
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/65869
Acceso en línea:http://hdl.handle.net/10810/65869
Access Level:acceso abierto
Palabra clave:biomass
biorefinery
hydrothermal treatments
lignin
cellulose nanocrystals
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spelling Hydrothermal treatments of walnut shells: a potential pretreatment for subsequent product obtainingMorales Matías, AmaiaLabidi Bouchrika, JalelGullón Estévez, Patriciabiomassbiorefineryhydrothermal treatmentslignincellulose nanocrystalsWalnuts are nowadays widely consumed. Since the edible part of walnuts does not account more than 50-60% of their total weight, the total amount of shells produced annually is huge. However, as walnut shells are part of lignocellulosic biomass, they could be valorised via a biorefinery approach in order to extract their diverse constituents. For this reason, the aim of this work was to valorise walnut shells by a biorefinery scheme. The latest involved multiple microwave assisted and conventional hydrothermal treatments for the subsequent valorisation of oligosaccharides. Then, an organosolv delignification of the solid that permitted the maximum oligosaccharide yield was performed, in order to isolate the lignin. Finally, it was treated for cellulose nanocrystal obtaining. The results showed, on the one hand, that the hydrothermal treatments leaded to xyloligossacharide-rich liquors (1–17 g/L). On the other hand, the organosolv delignification resulted into the extraction of a highly pure lignin (93.6%) and a weight average molecular weight of 7,000 Da. Moreover, the solid from the delignification treatment was suitable for a successful nanocrystal production. The extracted fractions could be employed in many applications and could be considered renewable precursors for new materials and chemicals. Hence, the proposed biorefinery scheme would allow an integral valorisation of currently undervalued walnut shells.The authors would like to acknowledge the financial support of the Department of Education of the Basque Government (IT1008-16). A. Morales would like to thank the University of the Basque Country (Training of Researcher Staff, PIF17/207)Elsevier202420242020info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/65869reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoIngléshttps://www.sciencedirect.com/science/article/pii/S0048969720363294info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/© 2020 Elsevier under CC BY-NC-ND licenseoai:addi.ehu.eus:10810/658692026-06-18T09:23:17Z
dc.title.none.fl_str_mv Hydrothermal treatments of walnut shells: a potential pretreatment for subsequent product obtaining
title Hydrothermal treatments of walnut shells: a potential pretreatment for subsequent product obtaining
spellingShingle Hydrothermal treatments of walnut shells: a potential pretreatment for subsequent product obtaining
Morales Matías, Amaia
biomass
biorefinery
hydrothermal treatments
lignin
cellulose nanocrystals
title_short Hydrothermal treatments of walnut shells: a potential pretreatment for subsequent product obtaining
title_full Hydrothermal treatments of walnut shells: a potential pretreatment for subsequent product obtaining
title_fullStr Hydrothermal treatments of walnut shells: a potential pretreatment for subsequent product obtaining
title_full_unstemmed Hydrothermal treatments of walnut shells: a potential pretreatment for subsequent product obtaining
title_sort Hydrothermal treatments of walnut shells: a potential pretreatment for subsequent product obtaining
dc.creator.none.fl_str_mv Morales Matías, Amaia
Labidi Bouchrika, Jalel
Gullón Estévez, Patricia
author Morales Matías, Amaia
author_facet Morales Matías, Amaia
Labidi Bouchrika, Jalel
Gullón Estévez, Patricia
author_role author
author2 Labidi Bouchrika, Jalel
Gullón Estévez, Patricia
author2_role author
author
dc.subject.none.fl_str_mv biomass
biorefinery
hydrothermal treatments
lignin
cellulose nanocrystals
topic biomass
biorefinery
hydrothermal treatments
lignin
cellulose nanocrystals
description Walnuts are nowadays widely consumed. Since the edible part of walnuts does not account more than 50-60% of their total weight, the total amount of shells produced annually is huge. However, as walnut shells are part of lignocellulosic biomass, they could be valorised via a biorefinery approach in order to extract their diverse constituents. For this reason, the aim of this work was to valorise walnut shells by a biorefinery scheme. The latest involved multiple microwave assisted and conventional hydrothermal treatments for the subsequent valorisation of oligosaccharides. Then, an organosolv delignification of the solid that permitted the maximum oligosaccharide yield was performed, in order to isolate the lignin. Finally, it was treated for cellulose nanocrystal obtaining. The results showed, on the one hand, that the hydrothermal treatments leaded to xyloligossacharide-rich liquors (1–17 g/L). On the other hand, the organosolv delignification resulted into the extraction of a highly pure lignin (93.6%) and a weight average molecular weight of 7,000 Da. Moreover, the solid from the delignification treatment was suitable for a successful nanocrystal production. The extracted fractions could be employed in many applications and could be considered renewable precursors for new materials and chemicals. Hence, the proposed biorefinery scheme would allow an integral valorisation of currently undervalued walnut shells.
publishDate 2020
dc.date.none.fl_str_mv 2020
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/65869
url http://hdl.handle.net/10810/65869
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://www.sciencedirect.com/science/article/pii/S0048969720363294
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2020 Elsevier under CC BY-NC-ND license
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2020 Elsevier under CC BY-NC-ND license
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Addi. Archivo Digital para la Docencia y la Investigación
instname:Universidad del País Vasco
instname_str Universidad del País Vasco
reponame_str Addi. Archivo Digital para la Docencia y la Investigación
collection Addi. Archivo Digital para la Docencia y la Investigación
repository.name.fl_str_mv
repository.mail.fl_str_mv
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