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<p>Grape stalks, an abundant byproduct of winemaking, are a promising source for nutraceutical applications due to their polyphenolic and pectic content. In this study, we evaluated the antioxidant and antimicrobial properties of grape stalk-derived polyphenols and the prebiotic potential of grape stalk-derived pectin. We assessed the antioxidant potential of polyphenol extracts through various in vitro tests (FRAP, TBARS, and metal chelation assays), finding significant reducing capacity, lipid peroxidation inhibition and metal chelation ability. Antimicrobial effects were also observed against probiotics, inhibiting <i>Lactobacillus acidophilus</i> CECT 1529 growth and biofilm formation, while <i>Enterococcus faecium</i> NCIMB 10415 exhibited reduced growth without biofilm disruption. In addition, we investigated the prebiotic potential of pectin extracts and its hydrolysates on the same probiotics <i>E. faecium</i> NCIMB 10415 and <i>L. acidophilus</i> CECT 1529. The hydrolysis significantly improved the availability of simple sugars, such as glucose and arabinose, thereby enhancing probiotic growth. Overall, pectin hydrolysate from ultrasonic treatment (PH-US) appeared to be the extract with the best prebiotic potential, providing an optimal balance of solubility and limited inorganic residues content. Our results underscore the potential of grape stalks as a cost-effective and sustainable source of antioxidants, antimicrobials, and prebiotics for the food and nutraceutical industries, supporting a circular economy approach.</p> Graphical Abstract <p></p>

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Antioxidants and prebiotics from enological wastes: recycling polyphenols and pectin to obtain nutraceuticals

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月17日

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  • Paola Ponsetto,
  • Chiara Magrini,
  • Emilia Malgorzata Sasal,
  • Carlotta Valle,
  • Roberto Mazzoli,
  • Giorgio Grillo,
  • Emanuela Calcio Gaudino,
  • Luisa Boffa,
  • Giancarlo Cravotto,
  • Emilia Garcia-Moruno,
  • Antonella Costantini,
  • Silvia Tabasso,
  • Enrica Pessione

摘要

Grape stalks, an abundant byproduct of winemaking, are a promising source for nutraceutical applications due to their polyphenolic and pectic content. In this study, we evaluated the antioxidant and antimicrobial properties of grape stalk-derived polyphenols and the prebiotic potential of grape stalk-derived pectin. We assessed the antioxidant potential of polyphenol extracts through various in vitro tests (FRAP, TBARS, and metal chelation assays), finding significant reducing capacity, lipid peroxidation inhibition and metal chelation ability. Antimicrobial effects were also observed against probiotics, inhibiting Lactobacillus acidophilus CECT 1529 growth and biofilm formation, while Enterococcus faecium NCIMB 10415 exhibited reduced growth without biofilm disruption. In addition, we investigated the prebiotic potential of pectin extracts and its hydrolysates on the same probiotics E. faecium NCIMB 10415 and L. acidophilus CECT 1529. The hydrolysis significantly improved the availability of simple sugars, such as glucose and arabinose, thereby enhancing probiotic growth. Overall, pectin hydrolysate from ultrasonic treatment (PH-US) appeared to be the extract with the best prebiotic potential, providing an optimal balance of solubility and limited inorganic residues content. Our results underscore the potential of grape stalks as a cost-effective and sustainable source of antioxidants, antimicrobials, and prebiotics for the food and nutraceutical industries, supporting a circular economy approach.

Graphical Abstract