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<p>This study explores ultrasound-assisted extraction (UAE) as an innovative technique to enhance the yield and quality of chokeberry and blackcurrant seed oils. The effects of UAE on extraction efficiency, oxidative stability, polyphenol content, antioxidant activity, and fatty acid composition were evaluated immediately after extraction and following three months of storage. Oils obtained through conventional methods and cold pressing served as references. UAE significantly increased oil recovery, particularly in chokeberry seeds, where yields more than doubled compared to conventional extraction (1.74% in conventional process and 4.25–4.31% in UAE). Blackcurrant seed oils yields increased from 6.43% to 7.13–8.78% depending on UAE conditions applied. The extraction parameters played a crucial role in oil quality, with moderate ultrasound conditions (60% amplitude, 12&#xa0;min) promoting higher polyphenol content and antioxidant activity in chokeberry oil. In contrast, more intense sonication (90% amplitude, 6&#xa0;min) was more effective for blackcurrant oil. While oxidative stability decreased over 3-month storage, chokeberry oils extracted in ultrasound-assisted procedure maintained greater stability than conventionally extracted samples, retaining 92% of their original oxidation induction time compared to 78% and 86% for control and cold-pressed oils, respectively. In blackcurrant seed oils, that effect was not noted. A weak correlation between oxidative stability and total polyphenol content suggests that lipophilic antioxidants may contribute more significantly to oil preservation. The fatty acid profile remained stable throughout storage, highlighting the resistance to storage-induced changes of the extracted oils. These findings demonstrate the potential of ultrasound-assisted techniques for improving oil extraction efficiency while preserving valuable bioactive compounds, offering a sustainable alternative to conventional processing methods.</p> Graphical abstract <p></p>

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Valorization of fruit by-products into oils: the benefits of ultrasound treatment for yield, oxidative stability, fatty acid profile, and antioxidant retention

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • Iga Piasecka,
  • Rita Brzezińska,
  • Magdalena Wirkowska-Wojdyła,
  • Ewa Ostrowska-Ligęza,
  • Agata Górska

摘要

This study explores ultrasound-assisted extraction (UAE) as an innovative technique to enhance the yield and quality of chokeberry and blackcurrant seed oils. The effects of UAE on extraction efficiency, oxidative stability, polyphenol content, antioxidant activity, and fatty acid composition were evaluated immediately after extraction and following three months of storage. Oils obtained through conventional methods and cold pressing served as references. UAE significantly increased oil recovery, particularly in chokeberry seeds, where yields more than doubled compared to conventional extraction (1.74% in conventional process and 4.25–4.31% in UAE). Blackcurrant seed oils yields increased from 6.43% to 7.13–8.78% depending on UAE conditions applied. The extraction parameters played a crucial role in oil quality, with moderate ultrasound conditions (60% amplitude, 12 min) promoting higher polyphenol content and antioxidant activity in chokeberry oil. In contrast, more intense sonication (90% amplitude, 6 min) was more effective for blackcurrant oil. While oxidative stability decreased over 3-month storage, chokeberry oils extracted in ultrasound-assisted procedure maintained greater stability than conventionally extracted samples, retaining 92% of their original oxidation induction time compared to 78% and 86% for control and cold-pressed oils, respectively. In blackcurrant seed oils, that effect was not noted. A weak correlation between oxidative stability and total polyphenol content suggests that lipophilic antioxidants may contribute more significantly to oil preservation. The fatty acid profile remained stable throughout storage, highlighting the resistance to storage-induced changes of the extracted oils. These findings demonstrate the potential of ultrasound-assisted techniques for improving oil extraction efficiency while preserving valuable bioactive compounds, offering a sustainable alternative to conventional processing methods.

Graphical abstract