Oxidation stress and antioxidant levels in tangerine pericarp

P. M.Y. Yeung, W. Li, C. H. Ip, Ming Hung Wong, R. Y.H. Chan, A. S.N. Wong, K. W. Chau, G. Y.S. Chan*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review


Tangerine peel is a common traditional Chinese medicine and an herb for Chinese food preparation. In order to study the influence of oxidative stress, ozonated water, gaseous ozone and UV radiation were applied to potted tangerine plants and the antioxidant levels in fruit pericarp were compared. After being watered daily with 500 mL ozonated water (0.84 mg/L dissolved ozone) for two weeks; a 19.5% increase in pericarp antioxidant level was detected. After plant samples were exposed to 6 ppm ozone, 2.88 KJ/m2 UV or a combination of both for 30, 60 and 120 min daily for the same period; decreases in antioxidant level were found and were generally in proportion to the time course of treatment. The results indicated that the oxidants depleted the antioxidant in the pericarp of mature tangerine. Ozonated water application to soil, however, as a systemic response increased the antioxidant level in the pericarp.

Original languageEnglish
Pages (from-to)198-203
Number of pages6
JournalProgress in Nutrition
Issue number3
Publication statusPublished - Nov 2011

Scopus Subject Areas

  • Food Science
  • Nutrition and Dietetics

User-Defined Keywords

  • Oxidant
  • Ozonated water
  • Ozone
  • Ultra violet radiation


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