Red wine phenolic complexes and their in vitro antioxidant activity

Area of Science:

• Food Chemistry
• Wine Science
• Antioxidant Research

Background:

• Phenolic complexes are key polyphenols in aged red wine.
• Understanding their antioxidant properties is crucial for wine quality and health benefits.

Purpose of the Study:

• To evaluate the in vitro antioxidant activity of phenolic complexes from aged red wine.
• To compare the antioxidant capacity of phenolic complexes with their constituent monomers and other standards.

Main Methods:

• Red wine polyphenols were fractionated into monomers, oligomers, polymers, anthocyanins, and complexes.
• In vitro antioxidant activities were assessed using the DPPH* assay.
• Antioxidant variations during condensation reactions of epicatechin and malvidin 3-glucoside were monitored.

Main Results:

• The phenolic complex fraction demonstrated significant in vitro antioxidant activity.
• Newly formed condensation products also retained strong antioxidant capacities.
• Antioxidant activity of complexes was comparable to their individual phenolic components.

Conclusions:

• Red wine phenolic complexes possess substantial in vitro antioxidant activity.
• This study provides the first direct evidence for the antioxidant capacity of these complexes.