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Phenolic compounds from pumpkin pulp: Extraction optimization and biological properties.

Nicola Pinna1, Salwa Ben Abbou2, Federica Ianni1

  • 1Department of Pharmaceutical Sciences, University of Perugia, 06126 Perugia, Italy.

Food Chemistry: X
|August 7, 2024
PubMed
Summary

Pumpkin pulp is a rich source of beneficial polyphenols, extractable using optimized ultrasound methods. This study highlights its potential for developing natural health products.

Keywords:
Antioxidant activityBioactivesCropFunctional foodsHPLC-DAD analysisPhenol extraction

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Area of Science:

  • Food Science
  • Phytochemistry
  • Analytical Chemistry

Background:

  • Pumpkin pulp is a byproduct often discarded, yet it contains valuable bioactive compounds.
  • Polyphenols are known for their antioxidant and health-promoting properties.
  • Efficient extraction methods are crucial for isolating these compounds from plant matrices.

Purpose of the Study:

  • To optimize ultrasound-assisted extraction (UAE) of polyphenols from pumpkin pulp.
  • To evaluate polyphenol content and bioactivity across different pumpkin varieties and harvest years.
  • To assess the potential of pumpkin pulp as a source for natural health products.

Main Methods:

  • Response surface methodology (RSM) and full factorial design were used to optimize UAE parameters (time, solvent ratio, ethanol-water percentage).
  • Optimized conditions were applied to five pumpkin varieties over two harvest years.
  • Phenolic content was quantified (e.g., gallic acid), and antioxidant activity was measured (e.g., Trolox equivalents). Antimicrobial activity was also assessed.

Main Results:

  • Optimized UAE conditions achieved efficient polyphenol extraction.
  • Phenolic acids were the predominant class, with gallic acid reaching up to 413.50 μg/g.
  • Violina rugosa variety from 2021 showed the highest total phenol content and antioxidant capacity.
  • All pumpkin varieties demonstrated antimicrobial activity.

Conclusions:

  • Pumpkin pulp is a viable and promising source of polyphenols.
  • Ultrasound-assisted extraction is an effective method for isolating these compounds.
  • The findings support the development of health-promoting products from pumpkin pulp.