Mechanism-driven stabilization of anthocyanins: comparative copigmentation and encapsulation for food applications

Area of Science:

• Food Science
• Natural Products Chemistry
• Colorant Technology

Background:

• Anthocyanins are widely used natural colorants.
• Their application is limited by instability towards pH, temperature, light, metals, oxygen, and enzymes.
• Degradation involves molecular routes like hydration, oxidative cleavage, and deglycosylation.

Purpose of the Study:

• To review molecular degradation mechanisms of anthocyanins.
• To distill design rules for anthocyanin stabilization.
• To compare different stabilization strategies and their applications.

Main Methods:

• Literature review of anthocyanin degradation and stabilization.
• Analysis of molecular degradation pathways (hydration, oxidative cleavage, deglycosylation).
• Comparison of stabilization strategies: intramolecular copigmentation, intermolecular copigmentation, and carrier encapsulation.

Main Results:

• Stabilization strategies include acylation, glycosylation, methylation, copigmentation with phenolics/proteins/polysaccharides, metal coordination, and encapsulation (liposomes, polymers, hydrogels).
• Protection mechanisms involve chromophore stabilization, microenvironment buffering, barrier effects, and controlled release.
• Specific strategies are recommended for different food matrices (beverages, dairy, bakery).

Conclusions:

• Understanding degradation mechanisms is key to effective stabilization.
• Copigmentation and encapsulation offer viable solutions for preserving anthocyanin color.
• Practical guidance is provided for selecting strategies to enhance formulation and shelf-life.