2024-03-28T17:25:53Zhttp://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/437222021-08-02T21:16:32Zcom_10324_1173com_10324_931com_10324_894col_10324_1371
Ramos Andrés, Marta
Andrés Iglesias, Cristina
García Serna, Juan
2020-11-30T10:18:28Z
2020-11-30T10:18:28Z
2019
Bioresource Technology Volume 292, 2019, 121940
0960-8524
http://uvadoc.uva.es/handle/10324/43722
10.1016/j.biortech.2019.121940
121940
Bioresource Technology
292
Spent coffee grounds are a huge residual stream from instant coffee makers. The production of spent coffee oil and molecular weight fractionated hemicellulose hydrolysates via supercritical CO2 and a hydrothermal treatment followed by concentration, separation, and purification through cascade ultrafiltration/diafiltration (30-10-5 kDa) was studied. Hemicelluloses extraction yield reached 3.49 g/100 g of dry defatted spent coffee after 40 min at 160 °C. The ultrafiltration system allowed concentrating up to 5-fold certain groups of hemicellulose, being most of them retained in the first membrane. Hemicellulose concentration and molecular weight of the feed exerted a great influence on the mass transfer through the membrane due to the formation of aggregates. However, purification through diafiltration allowed both to decrease by-products retentions from 45.6% to 8.7%, increasing the molecular weight of each fraction. Six hemicellulose products were obtained with purities between 83.7 and 97.8 wt% and weight-average molecular weights between 1641 and 49,733 Da.
eng
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2019 Elsevier
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Production of molecular weight fractionated hemicelluloses hydrolyzates from spent coffee grounds combining hydrothermal extraction and a multistep ultrafiltration/diafiltration
info:eu-repo/semantics/article