Removal of phenolic endocrine disruptors by Portulaca oleracea

Sofue Imai, Atsuhiko Shiraishi, Kazuaki Gamo, Ippei Watanabe, Hiroshi Okuhata, Hitoshi Miyasaka, Kazunori Ikeda, Takeshi Bamba, Kazumasa Hirata

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)


Portulaca oleracea, a garden plant prevalent from spring to autumn in Japan, showed the ability to efficiently remove from water bisphenol A (BPA), which is well known as an endocrine disrupting compound (EDC) having estrogenic properties. In water culture, 50 μM BPA was almost completely removed within 24 h when the ratio of whole plant weight to the water volume was set up at 1 g to 25 ml. The estrogenic activity of the water decreased in parallel with the elimination of BPA. This plant also rapidly removed other EDCs having a phenol group including octylphenol (OP), nonylphenol (NP), 2,4-dichlorophenol (2,4-DCP) and 17β-estradiol and, thereby, removed the endocrine disrupting activities. In addition, the ability of P. oleracea to remove BPA was not affected by BPA concentration (up to 250 μM), by cultivation in the dark, by temperatures ranging from 15°C to 30°C, or by pH ranging from 4 to 7. Moreover, the ability of P. oleracea to individually remove BPA, NP, and OP was the same as when they were all present. These results suggest that P. oleracea is a promising material for practical phytoremediation of landfill leachates and industrial wastewater contaminated with the tested EDCs.

Original languageEnglish
Pages (from-to)420-426
Number of pages7
JournalJournal of Bioscience and Bioengineering
Issue number5
Publication statusPublished - May 1 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology


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