Antioxidant activities of natural 9-CIS and synthetic all-trans β- carotene assessed by human neutrophil chemiluminescence

Qiang Liu, Katsuhiko Suzuki, Shigeyuki Nakaji*, Kazuo Sugawara

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Much attention has been focused on the biological activity of geometrical isomers of β-carotene. In the present study, the in vitro antioxidant activities of a natural 9-cis β-carotene purified from Dunaliella bardawil and synthetic all-trans β-carotene were studied using enhanced human neutrophil chemiluminescence upon stimulation with opsonized zymosan. Lucigenin-dependent chemiluminescence was used for largely measuring superoxide anion (O2) production, luminol-dependent chemiluminescence with sodium azide (NAN3) and horseradish peroxidase (HRP) was used for measuring hydrogen peroxide (H2O2) production, and luminol-dependent chemiluminescence without oxidant metabolism modulator was used for determination of myeloperoxidase (MPO)-mediated production. With β-carotene concentration of 1.4 μ M, neutrophils showed a decrease in lucigenin- dependent chemiluminescence to 75% and 78% of controls (p<0.05) by natural 9- cis β-carotene and synthetic all-trans β-carotene, respectively. With β- carotene concentration of 1.86 μ M, neutrophils also showed a decrease in luminol-dependent chemiluminescence in the presence of NaN3 and HRP to 86% and 81% of controls (p<0.05) by natural 9-cis β -carotene and synthetic all- trans β -carotene, respectively. On the other hand, neutrophils did not show a statistically significant difference in any chemiluminescence assay by the same concentration of natural 9-cis β-carotene and synthetic all-trans β - carotene. These results suggest that, up to the concentration of 1.86 μ M, natural 9-cis β -carotene and synthetic all-trans β-carotene exert equal antioxidant activities assessed by enhanced human neutrophil chemiluminescence.

Original languageEnglish
Pages (from-to)5-14
Number of pages10
JournalNutrition Research
Issue number1
Publication statusPublished - 2000 Jan
Externally publishedYes


  • Antioxidant
  • Chemiluminescence
  • Dunaliella bardawil
  • Human neutrophils
  • β-carotene
  • β-carotene isomers

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology
  • Nutrition and Dietetics


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