Abstract
Paulownia wood demand is increasing, but other parts of the tree remain underused. The leaves have medicinal properties, and their processing with a clean technology was explored. Supercritical fluid extraction (SFE) was proposed for the production of extracts from Paulownia elongata x fortunei leaves. Three isotherms (35 °C, 45 °C, and 55 °C) were studied in the pressure range of 10–30 MPa to assess their influence on the extraction yield and antiradical properties. The use of ethanol as cosolvent was also evaluated. A global extraction yield of 4 g extract /100 g of leaves was obtained at 30 MPa and 45 °C using 10% ethanol (w/w) as modifier; the last fractions reached up to 0.30 g Trolox eq./g extract. Serial extractions with different concentrations of ethanol (60, 70, 80, and 96%) were performed. The global yield obtained with 70% ethanol in three stages was 32.9 g extract/100 g leaves, and the antiradical capacity of the first stage extract was equivalent to 0.4 g Trolox/g extract. Extraction kinetics was studied, and overall extraction curves were represented using Sovová’s model.
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The authors thank Ángel Álvarez for his help in collecting samples and Sheila Gómez for her technical assistance.
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This work was funded by the Ministry of Economy, Industry and Competitiveness of Spain through the project CTM2015-68503-R and by the PIF grant BES-2016-076840.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Paula Rodríguez Seoane and Beatriz Díaz Reinoso. The first draft of the manuscript was written by Herminia Domínguez, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Rodríguez-Seoane, P., Díaz-Reinoso, B. & Domínguez, H. Supercritical CO2 extraction of antioxidants from Paulownia elongata x fortunei leaves. Biomass Conv. Bioref. 12, 3985–3993 (2022). https://doi.org/10.1007/s13399-020-01022-3
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DOI: https://doi.org/10.1007/s13399-020-01022-3