Procyanidins from Cranberry Press Residues-Extraction Optimization, Purification and Characterization

Area of Science:

• Food Chemistry
• Nutraceuticals
• Natural Products

Background:

• Procyanidins, polyphenols found in foods like cranberries, exhibit antioxidant, anticancer, and anti-inflammatory properties.
• American cranberries are a significant source of Type A procyanidins, utilized for preventing urinary tract infections.
• Cranberry processing for juice generates press residues rich in extractable procyanidins.

Purpose of the Study:

• To optimize the extraction of procyanidins from American cranberry press residues.
• To purify and fractionate extracted procyanidins.
• To evaluate the antioxidative potential and characterize individual procyanidins in the fractions.

Main Methods:

• Response Surface Methodology (RSM) for extraction optimization.
• Acetone-based extraction without acidifying agents.
• Liquid Chromatography-Electrospray Ionization-Fourier Transform Ion Cyclotron Resonance-High Resolution Mass Spectrometry (LC-ESI-FTICR-HRMS) for analysis.
• DPPH, ABTS, and FRAP assays for antioxidative activity assessment.

Main Results:

• Optimal extraction achieved using 53% acetone without an acidifying agent.
• A strong correlation was found between procyanidin content and antioxidative activity.
• Purified fractions contained 78 individual procyanidins, including 65 Type A, with a polymerization degree up to 9.

Conclusions:

• Cranberry press residues are a valuable source of Type A procyanidins with significant antioxidative potential.
• Optimized extraction methods can yield high-quality nutraceuticals from food waste.
• Further research into these fractions could lead to novel health applications.