Journal
BIOMASS CONVERSION AND BIOREFINERY
Volume 12, Issue 9, Pages 3985-3993Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s13399-020-01022-3
Keywords
Paulownia; Valorization; Supercritical CO2; Antiradical; Modelling
Categories
Funding
- Ministry of Economy, Industry and Competitiveness of Spain [CTM2015-68503-R]
- PIF grant [BES-2016-076840]
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The study explored the supercritical fluid extraction (SFE) of Paulownia elongata x fortunei leaves, finding that with the use of ethanol as a modifier, the extraction yield and antiradical properties can be enhanced under certain temperature and pressure conditions.
Paulowniawood 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 fromPaulownia elongata x fortuneileaves. Three isotherms (35 degrees C, 45 degrees C, and 55 degrees 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 degrees 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 Sovova's model.
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