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<p>As interest in natural antioxidants grows, grapevine (<i>Vitis vinifera</i> L.) leaves, removed upon fruit set defoliation, are gaining attention as sustainable sources of bioactive compounds. This study explores the phytochemical composition and antioxidant potential of Muscat Italia grapevine leaves from organic and conventional vineyards. Leaves were analyzed for total phenolic content (TPC), flavonoid content (TFC), condensed tannins (CTC), and antioxidant activity while FTIR spectroscopy and HPLC–DAD were used for phenolic profiling. Results revealed that organic cultivation significantly enhanced bioactive compound accumulation. Organic leaves exhibited a 2.92-fold increase in TPC and a 1.8-fold increase in CTC compared to conventional leaves. FTIR analysis showed more varied spectral features associated with flavonoids, phenolic acids and antioxidant-related functional groups in organic leaves. Besides, HPLC–DAD revealed more diverse phenolic profiles in organic samples, identifying 11 compounds versus 6 in conventional leaves. These results demonstrate the positive impact of organic farming practices on the phytochemical profile of grapevine leaves, removed during fruit set from organic vineyards and highlight their potential for valorization as sustainable sources of functional ingredients for food, cosmetics, and pharmaceuticals.</p>

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Unlocking the antioxidant potential of removed grapevine leaves: a sustainable approach to viticultural by-products

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Hassène Zemni,
  • Samia Daldoul,
  • Faouzia Hanzouli,
  • Hatem Boubakri,
  • Ramla Khiari,
  • Asma Ben Salem

摘要

As interest in natural antioxidants grows, grapevine (Vitis vinifera L.) leaves, removed upon fruit set defoliation, are gaining attention as sustainable sources of bioactive compounds. This study explores the phytochemical composition and antioxidant potential of Muscat Italia grapevine leaves from organic and conventional vineyards. Leaves were analyzed for total phenolic content (TPC), flavonoid content (TFC), condensed tannins (CTC), and antioxidant activity while FTIR spectroscopy and HPLC–DAD were used for phenolic profiling. Results revealed that organic cultivation significantly enhanced bioactive compound accumulation. Organic leaves exhibited a 2.92-fold increase in TPC and a 1.8-fold increase in CTC compared to conventional leaves. FTIR analysis showed more varied spectral features associated with flavonoids, phenolic acids and antioxidant-related functional groups in organic leaves. Besides, HPLC–DAD revealed more diverse phenolic profiles in organic samples, identifying 11 compounds versus 6 in conventional leaves. These results demonstrate the positive impact of organic farming practices on the phytochemical profile of grapevine leaves, removed during fruit set from organic vineyards and highlight their potential for valorization as sustainable sources of functional ingredients for food, cosmetics, and pharmaceuticals.