Removal of phenolic endocrine disruptors by Portulaca oleracea

Imai, Sofue; Shiraishi, Atsuhiko; Gamo, Kazuaki; Watanabe, I.; Okuhata, Hiroshi; Miyasaka, Hitosihi; Ikeda, Kazuhito; Bamba, Takeshi; Hirata, Kazumasa

doi:10.1263/jbb.103.420

Cited by 80 publications

(36 citation statements)

References 17 publications

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“…Solids removal during the reed bed process contribute to the removal process as the adsorption coefficients reported in Table 4 show that the EDCs adsorb significantly to the solid phase. Biodegradation is also possible as previous research by Imai et al (2007) demonstrated that phenolic EDCs are significantly removed by plants through enzyme metabolism. WWTP A and C also showed some removal during the sand filtration process.…”

Section: Biological Treatmentmentioning

confidence: 99%

The fate and behavior of selected endocrine disrupting chemicals in full scale wastewater and sludge treatment unit processes

Ifelebuegu

2011

Int. J. Environ. Sci. Technol.

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AB STRACT: Endocrine disrupting chemicals are discharged into the environment mainly through wastewater treatment processes. There is a need for better understanding of the fate of these compounds in the unit processes of treatment plant to optimise their removal. The fate of oestrone, 17β-estradiol, 17α-ethinyestradiol and nonylphenol in the unit processes of full scale wastewater treatment plants in the UK, including activated sludge plant, oxidation ditch, biofilter and rotating biological contactor were investigated. The overall removal efficiencies of all the compounds ranged from 41 % to 100 %. The removals were predominantly during the secondary biological treatment with the rates of removal related to the nitrification rates and the sludge age. The removal efficiency of the treatment processes were in the order activated sludge > oxidation ditch > biofilter > rotating biological contactors. Activated sludge plant configured for biological nutrient removal showed better removal of the endocrine disrupting chemicals compared to conventional activated sludge plant effluents. Tertiary treatment was also significant in the removal process through solids removal. Overall mechanisms of removal were biodegradation and sorption unto sludge biomass. Phytoremediation was also significant in the removal processes. The endocrine disrupting chemicals persisted in the anaerobic sludge digestion process with percentage removals ranging fro 10-48 %. Sorption of the endocrine disrupting chemicals onto the sludge increased with increasing values for the partitioning coefficients and the organic carbon contents of the sludge.

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Section: Biological Treatmentmentioning

confidence: 99%

The fate and behavior of selected endocrine disrupting chemicals in full scale wastewater and sludge treatment unit processes

Ifelebuegu

2011

Int. J. Environ. Sci. Technol.

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“…was purchased from a local market in Osaka, Japan. Sterile plants were obtained by successive transfers and cultivation of shoots cut from whole plants on Murashige-Skoog medium (including vitamins) containing 1% sucrose and 0.2% gellan-gum in a culture bottle at 25°C under continuous light (50-100 µmol m −2 s −1 ), as described previously (Imai et al 2007). Plants cultivated under the same conditions for 2 months were used for this study.…”

Section: Plant Materials and Culture Conditionsmentioning

confidence: 99%

“…We found that portulaca (Portulaca oleracea cv.) was superior to other plants in removing BPA; the plant almost completely removed 50 µM BPA from a hydroponic solution within 24 h (Imai et al 2007). Immediately after soaking portulaca roots in a BPA solution, BPA is converted to metabolites that do not have estrogenic activity.…”

mentioning

confidence: 96%

“…Immediately after soaking portulaca roots in a BPA solution, BPA is converted to metabolites that do not have estrogenic activity. Portulaca roots also removed other EDCs, including octylphenol (OP), nonylphenol (NP) and the female hormone 17β-estradiol (E2) (Imai et al 2007). ese observations indicate that portulaca holds great promise as a useful tool in the development of a practical phytoremediation system for EDCs.…”

mentioning

confidence: 99%

“…Previously, we analyzed the structure of BPA metabolites produced by portulaca roots and detected a hydroxylation product of BPA (Imai et al 2007). Therefore, we hypothesized that polyphenol oxidase (PPO) is involved in BPA detoxi cation by portulaca roots.…”

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confidence: 99%

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Isolation of polyphenol oxidase genes from Portulaca oleracea and evaluation of their ability to metabolize endocrine-disrupting chemicals

Kaneda

Matsui

Tomiyasu

et al. 2012

Plant Biotechnology

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Portulaca (Portulaca oleracea cv.), a garden plant, e ciently removes endocrine-disrupting chemicals (EDCs) including bisphenol A (BPA) from hydroponic solution. We hypothesized that polyphenol oxidase (PPO) was involved in the initial steps of detoxifying EDCs in portulaca roots. In order to elucidate the molecular basis of portulaca's ability to metabolize EDCs, we rst isolated ve PPO genes (PoPPO1-5) that were expressed mainly in portulaca roots. Among these genes, PoPPO2, PoPPO4 and PoPPO5 were introduced into cultured tobacco cells and expressed as active forms. We found that crude extracts from the cells expressing PoPPO2, PoPPO5, and to a lesser extent PoPPO4, could metabolize BPA. In addition, we found that the BPA metabolites from crude extracts of cells expressing PoPPO2, PoPPO4 and PoPPO5 were identical to those of portulaca. Moreover, PoPPO2 and PoPPO5 also caused hydroxylation of octylphenol, nonylphenol and 17β-estradiol. erefore, these results strongly suggest that PoPPOs signi cantly contribute to the superior ability of portulaca to metabolize EDCs.

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Sorption, uptake, and biotransformation of 17β‐estradiol, 17α‐ethinylestradiol, zeranol, and trenbolone acetate by hybrid poplar

Bircher

Card

Zhai

et al. 2015

Enviro Toxic and Chemistry

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Hormonally active compounds may move with agricultural runoff from fields with applied manure and biosolids into surface waters where they pose a threat to human and environmental health. Riparian zone plants could remove hormonally active compounds from agricultural runoff. Therefore, sorption to roots, uptake, translocation, and transformation of 3 estrogens (17β-estradiol, 17α-ethinylestradiol, and zeranol) and 1 androgen (trenbolone acetate) commonly found in animal manure or biosolids were assessed by hydroponically grown hybrid poplar, Populus deltoides x nigra, DN-34, widely used in riparian buffer strips. Results clearly showed that these hormones were rapidly removed from 2 mg L(-1) hydroponic solutions by more than 97% after 10 d of exposure to full poplar plants or live excised poplars (cut-stem, no leaves). Removals by sorption to dead poplar roots that had been autoclaved were significantly less, 71% to 84%. Major transformation products (estrone and estriol for estradiol; zearalanone for zeranol; and 17β-trenbolone from trenbolone acetate) were detected in the root tissues of all 3 poplar treatments. Root concentrations of metabolites peaked after 1 d to 5 d and then decreased in full and live excised poplars by further transformation. Metabolite concentrations were less in dead poplar treatments and only slowly increased without further transformation. Taken together, these findings show that poplars may be effective in controlling the movement of hormonally active compounds from agricultural fields and avoiding runoff to streams.

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Removal of phenolic endocrine disruptors by Portulaca oleracea

Cited by 80 publications

References 17 publications

The fate and behavior of selected endocrine disrupting chemicals in full scale wastewater and sludge treatment unit processes

The fate and behavior of selected endocrine disrupting chemicals in full scale wastewater and sludge treatment unit processes

Isolation of polyphenol oxidase genes from Portulaca oleracea and evaluation of their ability to metabolize endocrine-disrupting chemicals

Sorption, uptake, and biotransformation of 17β‐estradiol, 17α‐ethinylestradiol, zeranol, and trenbolone acetate by hybrid poplar

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