Antioxidant capacities vary substantially among cultivars of rabbiteye blueberry (Vaccinium ashei Reade)

Authors

  • Shiow Y. Wang,

    Corresponding author
    1.  Genetic Improvement of Fruits and Vegetables Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, U. S.  Department of Agriculture, Beltsville, MD 20705-2350, USA
      Fax: +1 301 504 5107;
      e-mail: shiow.wang@ars.usda.gov
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  • Hangjun Chen,

    1.  Genetic Improvement of Fruits and Vegetables Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, U. S.  Department of Agriculture, Beltsville, MD 20705-2350, USA
    2.  Food Science Institute, Zhejiang Academy of Agricultural Sciences, Hangzhou, 310021, Zhejiang, China
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  • Mark K. Ehlenfeldt

    1.  Genetic Improvement of Fruits and Vegetables Laboratory, U. S. Department of Agriculture, Agricultural Research Service, Located at the  Marucci Center for Blueberry and Cranberry Research and Extension, Rutgers University, Chatsworth, NJ 08019, USA
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Fax: +1 301 504 5107;
e-mail: shiow.wang@ars.usda.gov

Summary

Fruits from forty-two blueberry cultivars, including thirty-six rabbiteye (Vaccinium ashei Reade), three V. ashei hybrid derivatives and three northern highbush (V. corymbosum L.) standards, were evaluated for their antioxidant activities against peroxyl free radicals (ROO˙), hydroxyl radicals (OH˙), hydrogen peroxide (H2O2), superoxide radicals (inline image) and singlet oxygen (1O2) radicals. The differences in scavenging capacities for these radicals among forty-two selected blueberry cultivars were significant. Oxygen radical absorbance capacity values ranged from 33.8 to 118.7 μmol Trolox equivalents (TE) g fresh wt−1, 196.1 to 518.8 μmol TE g dry wt−1 and 7.1 to 22.2 μmol cm−2-surface area. Extracts from fruit of pure rabbiteye had higher levels of scavenging capacities of oxygen species inline image, 1O2 and H2O2 compared to V. ashei hybrid derivatives and northern highbush blueberry standards. The rabbiteye cultivars ‘Early May’ and ‘Centurion’ had the highest scavenging capacity for the reactive oxygen species, not only for ROO˙ and ˙OH, but also for inline image, 1O2 and a strong oxidant, H2O2. In contrast, ‘Pink Lemonade’ (pink-fruited) had the lowest ability to inhibit free radical activity of ROO˙,˙OH, 1O2, and H2O2.‘Snowflake’ had the lowest scavenging capacity for inline image. Blueberry cultivars with high antioxidant activity and radical scavenging capacity have potential to improve human health and can possibly be used as parents for future blueberry breeding programs to develop new blueberry cultivars with higher antioxidant activity.

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