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Occurrence, sorption, and transformation of free and conjugated natural steroid estrogens in the environment

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Abstract

Natural steroid estrogens (NSEs), including free estrogens (FEs) and conjugated estrogens (CEs), are of emerging concern globally among public and scientific community due to their recognized adverse effects on human and wildlife endocrine systems in recent years. In this review, the properties, occurrence, sorption process, and transformation pathways of NSEs are clarified in the environment. The work comprehensively summarizes the occurrence of both free and conjugated estrogens in different natural and built environments (e.g., river, WWTPs, CAFOs, soil, and sediment). The sorption process of NSEs can be impacted by organic compounds, colloids, composition of clay minerals, specific surface area (SSA), cation exchange capacity (CEC), and pH value. The degradation and transformation of free and conjugated estrogens in the environment primarily involves oxidation, reduction, deconjugation, and esterification reactions. Elaboration about the major, subordinate, and minor transformation pathways of both biotic and abiotic processes among NSEs is highlighted. The moiety types and binding sites also would affect deconjugation degree and preferential transformation pathways of CEs. Notably, some intermediate products of NSEs still remain estrogenic potency during transformation process; the elimination of total estrogenic activity needs to be addressed in further studies. The in-depth researches regarding the behavior of both free and conjugated estrogens are further required to tackle their contamination problem in the ecosystem.

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Abbreviations

NSEs:

Natural steroid estrogens

FEs:

Free estrogens

CEs:

Conjugated estrogens

WHO:

World Health Organization

EDCs:

Endocrine-disrupting chemicals

E1:

Estrone

17α-E2:

17α-Estradiol

17β-E2:

17β-Estradiol

E3:

Estriol

E4:

Estetrol

CSEs:

Conjugated sulfate estrogens

E1-3S:

Estrone-3-sulfate

17β-E2-3S:

17β-Estradiol-3-sulfate

17β-E2-17S:

17β-Estradiol-17-sulfate

17β-E2-3,17-2S:

17β-Estradiol-3,17-disulfate

E3-3S:

Estriol-3-sulfate

CGEs:

Conjugated glucuronide estrogens

E1-3G:

Estrone-3-glucuronide

17β-E2-3G:

17β-Estradiol-3-glucuronide

17β-E2-17G:

17β-Estradiol-17-glucuronide

E3-3G:

Estriol-3-glucuronide

E3-16G:

Estriol-16-glucuronide

E3-17G:

Estriol-17-glucuronide

CS-GEs:

Conjugated sulfate-glucuronide estrogens

17β-E2-3S-17G:

17β-Estradiol-3-sulfate-17-glucuronide

17β-E2-3G-17S:

17β-Estradiol-3-glucuronide-17-sulfate

E3-3S-16G:

Estriol-3-sulfate-16-glucuronide

WWTPs:

Wastewater treatment plants

HWWTPs:

Hospital wastewater treatment plants

CAFOs:

Concentrated animal feeding operations

K ow :

Octanol-water partition coefficient

K d :

Solid-water distribution coefficient

K oc :

Organic carbon distribution coefficient

pK a :

Acid dissociation constant

E-Screen:

Human breast cancer cell line proliferation

YES:

Yeast estrogen screen

LOQ:

Limit of quantification

LOD:

Limit of detection

DOM:

Dissolved organic matter

SRT:

Solid retention time

HRT:

Hydraulic retention time

ArySTS:

Arylsulfatase

GUSB:

β-glucuronidase

UV:

Ultraviolet

O3 :

Ozone

·OH:

Hydroxyl radical

SSA:

Specific surface area

CEC:

Cation exchange capacity

HA:

Humic acid

COC:

Colloidal organic carbon

DOC:

Dissolved organic carbon

ArySULT:

Arylsulfotransferase

References

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Acknowledgments

The authors express sincere thanks to Editor Professor Doctor Ester Heath and three anonymous reviewers for their critical and dedicated comments on the original manuscript, which greatly improved the quality of the final article.

Funding

This work was supported by the National Natural Science Foundation of China (51608079), National Engineering Technology Research Center for Inland Waterway Regulation and Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education Open Funding (SLK2018A04), Graduate Education Innovation Funding of School of River and Ocean Engineering, Chongqing Jiaotong University (YC2018002), and Laboratory Open Funding of Chongqing Jiaotong University (SYJ201608).

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Authors

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Correspondence to Banghao Du.

Additional information

Responsible editor: Ester Heath

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Highlights

• Occurrence of both free and conjugated estrogens in the environment is summarized.

• Major, subordinate, and minor biotic/abiotic transformation pathways are proposed.

• Sorption and transformation mechanisms of NSE mixtures are further required.

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Yu, W., Du, B., Yang, L. et al. Occurrence, sorption, and transformation of free and conjugated natural steroid estrogens in the environment. Environ Sci Pollut Res 26, 9443–9468 (2019). https://doi.org/10.1007/s11356-019-04402-z

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  • DOI: https://doi.org/10.1007/s11356-019-04402-z

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