doi:10.1016/j.fuproc.2017.05.020engGil-Lalaguna, N.Bautista, A.Gonzalo, A.Sánchez, J.L.Arauzo, J.Obtaining biodiesel antioxidant additives by hydrothermal treatment of lignocellulosic bio-oilART-2017-99638The potential use of bio-oil as a small-dosage additive for improving biodiesel oxidation stability has been investigated in this work. Lignocellulosic bio-oil was high-pressure processed under different mixtures of water and organic solvents in order to promote depolymerization of the high molecular lignin still present in bio-oil and increase the content of phenolics, whose antioxidant potential is known. In fact, the antioxidant potential of bio-oil was found to noticeably enhance after the hydrothermal treatment. While the addition of 2% of crude bio-oil improved biodiesel oxidation stability by 135%, the same amount of hydrotreated bio-oil (water, 300 °C, 8.5 MPa) led to an oxidation stability improvement of 400%, which was related to the increase in the concentration of catechol, as well as to the modification of antioxidant properties of the pyrolytic lignin fraction.2017http://zaguan.unizar.es/record/13085510.1016/j.fuproc.2017.05.020http://zaguan.unizar.es/record/130855oai:zaguan.unizar.es:130855info:eu-repo/grantAgreement/ES/DGA/T36info:eu-repo/grantAgreement/ES/MINECO-FEDER/ENE2013-41523-RFuel Processing Technology 166 (2017), 1-7by-nc-ndhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccess