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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    "description": "<p>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&deg;C, 230 &deg;C and 260 &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 %.&nbsp;&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 &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 &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&deg;C, 230 &deg;C and 260 &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 %.&nbsp;&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 &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 &ndash; 11.66 mg GAE/ mg of dry sample).</p>", 
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    "title": "Improving the recovery of phenolic compounds from spent coffee grounds by using hydrothermal delignification coupled with ultrasound assisted extraction.", 
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    "keywords": [
      "Hydrothermal delignification", 
      "spent coffee grounds", 
      "phenolic content", 
      "ultrasonic assisted extraction"
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    "publication_date": "2020-06-14", 
    "creators": [
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        "affiliation": "University of Hohenheim", 
        "name": "P. J. Arauzo"
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      {
        "affiliation": "University of Trento", 
        "name": "M. Lucian"
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      {
        "affiliation": "University of Hohenheim", 
        "name": "L. Du"
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      {
        "affiliation": "University of Hohenheim", 
        "name": "M. P. Olszewski"
      }, 
      {
        "affiliation": "University of Trento", 
        "name": "L. Fiori"
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        "affiliation": "University of Hohenheim", 
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