Hydrothermal Extraction of Valuable Components from Leaves and Petioles from Paulownia elongata x fortunei
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ORIGINAL PAPER
Hydrothermal Extraction of Valuable Components from Leaves and Petioles from Paulownia elongata x fortunei Paula Rodríguez‑Seoane1 · Cristina del Pozo2 · Neus Puy2,3 · Jordi Bartrolí2 · Herminia Domínguez1 Received: 11 May 2020 / Accepted: 3 November 2020 © Springer Nature B.V. 2020
Abstract The leaves and petioles of Paulownia elongata x fortunei are residual fractions from the tree plantations commercially destined to the production of wood and their valorization could contribute to the rational utilization of this resource. The saccharidic fraction is the most abundant in both parts of the plant and the sugar profile is very similar, but the ethanol extractives are more abundant in leaves. Non isothermal processing was selected since it provided better results than isothermal extraction with shorter times. For this reason, optimization of autohydrolysis under non isothermal operation (140–240 °C) was performed for both materials: leaves and petioles. The final autohydrolysis temperature highly influenced the saccharidic, proteic, phenolic and volatile composition of the extracts. Operating under selected conditions leaves provided extracts with more antioxidant compounds than petioles. The proposed technology provides a variety of commercially valuable components, which could contribute to the integral use of this energetic crop following a biorefinery approach.
Electronic Supplementary Material The online version of this article (https://doi.org/10.1007/s12649-020-01298-6) contains supplementary material, which is available to authorized users. * Paula Rodríguez‑Seoane [email protected] 1
Chemical Engineering Department, Universidad de Vigo (Campus Ourense). Edificio Politécnico. As Lagoas, 32004 Ourense, Spain
2
Chemical Department, Universitat Autònoma de Barcelona (Campus UAB). Cerdanyola del Vallès, 08193 Barcelona, Spain
3
Forest Science and Technology Centre of Catalonia (CTFC). Crta. Sant Llorenç de Morunys, km2.25280 Solsona, Lleida, Spain
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Waste and Biomass Valorization
Graphic Abstract
Keywords Paulownia elongata x fortunei · Leaves · Petioles · Autohydrolysis · Biorefinery · Antioxidants
Statement of Novelty
Introduction
The valorization of underused parts of the Paulownia tree (leaves, petioles) is interesting in order to provide a rational utilization of the raw material. Leaves and petioles are known for their biological properties. The extraction of phenolic bioactives with antioxidant properties is proposed using a green aqueous extraction based on the operation at high pressure. This process has not been reported previously for these materials and allows the solubilization of both phenolic and hemicellulosic fractions. The optimal extraction conditions (maximal temperature during heating) leading maximal extraction yields, and phenolic content and antiradical activity of the extracts were selected. The autohydrolysis treatment could serve as a first stage in a biorefinery process for the fractionated utilization of these
