A kinetic model describing antioxidation and prooxidation of β-carotene in the presence of α-tocopherol and ascorbic acid

Naomi Shibasaki-Kitakawa, Masahiko Murakami, Masaki Kubo, Toshikuni Yonemoto

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

β-Carotene oxidation in the presence of both lipophilic α-tocopherol and hydrophilic ascorbic acid was experimentally studied in a biphasic oil-water system. Ascorbic acid in the water phase had two opposite effects of promoting and suppressing α-tocopherol consumption in the oil phase and indirectly participated in the antioxidation and prooxidation of β-carotene in the oil phase. The drastic antioxidation of β-carotene by stopping the consumption of α-tocopherol was caused by the depletion of oxygen in the system due to the oxidation of ascorbic acid. A kinetic model was constructed by incorporating the oxidation of ascorbic acid itself in the water phase, the regeneration and consumption of α-tocopherol by ascorbic acid at the oil- water interface, and the oxygen mass transfer across the gas-oil interface and the oil-water interface. The model well described the antioxidation and prooxidation behavior of β-carotene in the presence of α-tocopherol and ascorbic acid and the oxygen concentration profiles in each phase. The model was able to effectively determine the appropriate amounts of lipophilic and hydrophilic antioxidants to prevent β-carotene oxidation under various conditions.

Original languageEnglish
Pages (from-to)815-824
Number of pages10
JournalJAOCS, Journal of the American Oil Chemists' Society
Volume89
Issue number5
DOIs
Publication statusPublished - 2012 May

Keywords

  • Antioxidant
  • Antioxidation
  • Biphasic oil-water system
  • Kinetic model
  • Lipid oxidation
  • Prooxidation

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Organic Chemistry

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