Journal article Open Access

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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  <identifier identifierType="URL">https://zenodo.org/record/3896789</identifier>
  <creators>
    <creator>
      <creatorName>P. J. Arauzo</creatorName>
      <affiliation>University of Hohenheim</affiliation>
    </creator>
    <creator>
      <creatorName>M. Lucian</creatorName>
      <affiliation>University of Trento</affiliation>
    </creator>
    <creator>
      <creatorName>L. Du</creatorName>
      <affiliation>University of Hohenheim</affiliation>
    </creator>
    <creator>
      <creatorName>M. P. Olszewski</creatorName>
      <affiliation>University of Hohenheim</affiliation>
    </creator>
    <creator>
      <creatorName>L. Fiori</creatorName>
      <affiliation>University of Trento</affiliation>
    </creator>
    <creator>
      <creatorName>A. Kruse</creatorName>
      <affiliation>University of Hohenheim</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Improving the recovery of phenolic compounds from spent coffee grounds by using hydrothermal delignification coupled with ultrasound assisted extraction.</title>
  </titles>
  <publisher>Zenodo</publisher>
  <publicationYear>2020</publicationYear>
  <subjects>
    <subject>Hydrothermal delignification</subject>
    <subject>spent coffee grounds</subject>
    <subject>phenolic content</subject>
    <subject>ultrasonic assisted extraction</subject>
  </subjects>
  <dates>
    <date dateType="Issued">2020-06-14</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/3896789</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1016/j.biombioe.2020.105616</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="https://creativecommons.org/licenses/by/4.0/legalcode">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;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&amp;deg;C, 230 &amp;deg;C and 260 &amp;deg;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 %.&amp;nbsp;&amp;nbsp; 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 &amp;ndash; 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 &amp;ndash; 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&amp;deg;C, 230 &amp;deg;C and 260 &amp;deg;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 %.&amp;nbsp;&amp;nbsp; 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 &amp;ndash; 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 &amp;ndash; 11.66 mg GAE/ mg of dry sample).&lt;/p&gt;</description>
  </descriptions>
  <fundingReferences>
    <fundingReference>
      <funderName>European Commission</funderName>
      <funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/501100000780</funderIdentifier>
      <awardNumber awardURI="info:eu-repo/grantAgreement/EC/FP7/319454/">319454</awardNumber>
      <awardTitle>"Marie Curie Actions in Horizon 2020: regional and international impact"</awardTitle>
    </fundingReference>
  </fundingReferences>
</resource>
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