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Astaxanthin diferulate as a bifunctional antioxidant.

T B R Papa1, V D Pinho, E S P do Nascimento

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|November 4, 2014
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Summary

Esterifying astaxanthin with ferulic acid creates a potent bifunctional antioxidant. This new compound, astaxanthin diferulate, demonstrates enhanced singlet oxygen quenching and radical scavenging capabilities compared to astaxanthin alone.

Keywords:
antioxidantantiradicalastaxanthincarotenoidplant phenol

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Area of Science:

  • Biochemistry
  • Antioxidant research
  • Free radical chemistry

Background:

  • Astaxanthin is a known antioxidant, but its efficacy can be modulated by chemical modification.
  • Ferulic acid is a phenolic compound with demonstrated antioxidant properties.
  • Understanding synergistic effects in antioxidant compounds is crucial for developing effective interventions.

Purpose of the Study:

  • To synthesize and characterize astaxanthin diferulate, a novel esterified form of astaxanthin and ferulic acid.
  • To evaluate the antioxidant activity of astaxanthin diferulate, specifically its singlet oxygen quenching and radical scavenging abilities.
  • To investigate the potential for mutual enhancement of antioxidant properties in the synthesized compound.

Main Methods:

  • Synthesis of astaxanthin diferulate.
  • Kinetic analysis of singlet oxygen quenching using rate constants (k2).
  • Measurement of radical scavenging activity against 1-hydroxyethyl radicals using second-order rate constants.
  • Utilizing a two-dimensional classification plot for electron donation and acceptance capabilities.

Main Results:

  • Astaxanthin diferulate exhibited a significantly higher rate constant for singlet oxygen quenching (1.58 x 10^10 L mol(-1)s(-1)) compared to astaxanthin (1.12 x 10^9 L mol(-1)s(-1)).
  • The ferulate moiety in astaxanthin diferulate showed enhanced radical scavenging activity (1.68 x 10^8 L mol(-1)s(-1)) versus free ferulic acid in a 1:2 mixture (1.60 x 10^7 L mol(-1)s(-1)).
  • The study rationalized the enhanced bifunctional antioxidant activity through electron donation and acceptance capabilities.

Conclusions:

  • Astaxanthin diferulate is a superior singlet oxygen quencher and radical scavenger compared to its individual components.
  • The esterification process results in a synergistic enhancement of antioxidant activity, creating a bifunctional molecule.
  • Astaxanthin diferulate represents a promising novel antioxidant with potential applications in various fields.