Protection against peroxynitrite by cocoa polyphenol oligomers

Area of Science:

• Food Science
• Biochemistry
• Pharmacology

Background:

• Flavonoids are natural plant compounds with antioxidant properties.
• Peroxynitrite is a reactive nitrogen species implicated in inflammatory processes.
• Dietary intake of flavonoids may offer protective benefits against oxidative stress and inflammation.

Purpose of the Study:

• To investigate the protective effects of procyanidin oligomers from Theobroma cacao seeds against peroxynitrite.
• To compare the efficacy of different sizes of procyanidin oligomers (monomer to nonamer) against peroxynitrite-induced damage.
• To assess the potential of cocoa-derived epicatechin oligomers as a dietary source for combating inflammation.

Main Methods:

• Isolation of procyanidin oligomers (monomer through nonamer) from Theobroma cacao seeds.
• Assay of antioxidant activity by measuring protection against peroxynitrite-dependent oxidation of dihydrorhodamine 123.
• Assay of anti-inflammatory activity by measuring protection against peroxynitrite-dependent nitration of tyrosine.

Main Results:

• Procyanidin oligomers demonstrated protective effects against peroxynitrite-mediated oxidation and nitration.
• Oligomers were more effective on a molar basis than monomeric epicatechin.
• The tetramer exhibited particularly high efficiency in protecting against both oxidation and nitration reactions.

Conclusions:

• Epicatechin oligomers found in cocoa powder and chocolate possess significant protective properties against peroxynitrite.
• These findings suggest that cocoa-derived flavonoids are a potent dietary source for defense against inflammation mediated by peroxynitrite.