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Improving the recovery of phenolic compounds from spent coffee grounds by using hydrothermal delignification coupled with ultrasound assisted extraction.

P. J. Arauzo; M. Lucian; L. Du; M. P. Olszewski; L. Fiori; A. Kruse


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  <dc:creator>P. J. Arauzo</dc:creator>
  <dc:creator>M. Lucian</dc:creator>
  <dc:creator>L. Du</dc:creator>
  <dc:creator>M. P. Olszewski</dc:creator>
  <dc:creator>L. Fiori</dc:creator>
  <dc:creator>A. Kruse</dc:creator>
  <dc:date>2020-06-14</dc:date>
  <dc:description>This study focuses on the maximization of the phenolic compounds of spent coffee grounds, by coupling hydrothermal delignification with ultrasonic assisted extraction. Temperatures of 200°C, 230 °C and 260 °C were applied for hydrothermal treatment for 1h and 3h. Produced hydrochars contain high values of fuel ratio (0.35 - 0.69) compared to raw feedstock (0.20). The increment of the reaction severity decreases the energy yield from 95.23 % to 82.99 %.   After the hydrothermal treatment, the total phenolic content (TPC of the process water), determined relatively to a gallic acid standard (GAE), was found to be in a similar range for all process conditions (9.52 – 8.07 mg GAE / mg of dry sample). Using methanol as a solvent into produced dry hydrochars during ultrasonic assisted extraction reveals the highest values of TPC (20.33 – 11.66 mg GAE/ mg of dry sample).This study focuses on the maximization of the phenolic compounds of spent coffee grounds, by coupling hydrothermal delignification with ultrasonic assisted extraction. Temperatures of 200°C, 230 °C and 260 °C were applied for hydrothermal treatment for 1h and 3h. Produced hydrochars contain high values of fuel ratio (0.35 - 0.69) compared to raw feedstock (0.20). The increment of the reaction severity decreases the energy yield from 95.23 % to 82.99 %.   After the hydrothermal treatment, the total phenolic content (TPC of the process water), determined relatively to a gallic acid standard (GAE), was found to be in a similar range for all process conditions (9.52 – 8.07 mg GAE / mg of dry sample). Using methanol as a solvent into produced dry hydrochars during ultrasonic assisted extraction reveals the highest values of TPC (20.33 – 11.66 mg GAE/ mg of dry sample).</dc:description>
  <dc:identifier>https://zenodo.org/record/3896789</dc:identifier>
  <dc:identifier>10.1016/j.biombioe.2020.105616</dc:identifier>
  <dc:identifier>oai:zenodo.org:3896789</dc:identifier>
  <dc:relation>info:eu-repo/grantAgreement/EC/FP7/319454/</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>https://creativecommons.org/licenses/by/4.0/legalcode</dc:rights>
  <dc:subject>Hydrothermal delignification</dc:subject>
  <dc:subject>spent coffee grounds</dc:subject>
  <dc:subject>phenolic content</dc:subject>
  <dc:subject>ultrasonic assisted extraction</dc:subject>
  <dc:title>Improving the recovery of phenolic compounds from spent coffee grounds by using hydrothermal delignification coupled with ultrasound assisted extraction.</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
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