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<p>The valorization of waste matrices by extracting from them valuable and relevant substances, represents an important goal from the point of view of the circular economy and the development of eco-sustainable procedures. In this work, an innovative and promising class of DESs, <i>aquo</i>DESs, binary water-based mixtures (such as betaine/water 1/5&#xa0;M and glycerol/water 1/2.55&#xa0;M), was proficiently used for the extraction of bioactive compounds such as caffeine and chlorogenic acids from spent coffee grounds. The total phenolic content, the radical scavenging activity and the molecular composition of the extracts were evaluated via UV–V is and HPLC measures. The results obtained, optimized with a D-optimal criterion, showed a superior extraction efficiency of the <i>aquo</i>DESs compared with water/ethanol mixture, with other commonly reported DESs and with water itself, underlining the peculiar and favourable features of these structured water-based systems. Green metrics were used for a quantitative evaluation of the overall greenness of the procedures, showing a really low environmental impact of the proposed methodology. This study opens up to the future possible direct use of the DESs extracts in different purposes, considering the food-grade of the molecules forming the <i>aquo</i>DESs systems themselves.</p>

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More than Water: Water-Based Binary Deep Eutectic Solvents (aquoDESs) for the Effective Ultrasound-Assisted Extraction of Bioactive Compounds from Spent Coffee Grounds

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Francesca Pompei,
  • Giada Montillo,
  • Elison Lepore,
  • Sauro Vittori,
  • Matteo Tiecco,
  • Cinzia Mannozzi

摘要

The valorization of waste matrices by extracting from them valuable and relevant substances, represents an important goal from the point of view of the circular economy and the development of eco-sustainable procedures. In this work, an innovative and promising class of DESs, aquoDESs, binary water-based mixtures (such as betaine/water 1/5 M and glycerol/water 1/2.55 M), was proficiently used for the extraction of bioactive compounds such as caffeine and chlorogenic acids from spent coffee grounds. The total phenolic content, the radical scavenging activity and the molecular composition of the extracts were evaluated via UV–V is and HPLC measures. The results obtained, optimized with a D-optimal criterion, showed a superior extraction efficiency of the aquoDESs compared with water/ethanol mixture, with other commonly reported DESs and with water itself, underlining the peculiar and favourable features of these structured water-based systems. Green metrics were used for a quantitative evaluation of the overall greenness of the procedures, showing a really low environmental impact of the proposed methodology. This study opens up to the future possible direct use of the DESs extracts in different purposes, considering the food-grade of the molecules forming the aquoDESs systems themselves.