State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, People's Republic of China.
Environ Toxicol Chem. 2013 Dec;32(12):2672-7. doi: 10.1002/etc.2349. Epub 2013 Oct 10.
The estrogen17β-estradiol (E2) is one of the most widely distributed natural estrogens and is the most potent estrogen in the environment. For the present study, methanogenic bacteria communities were chosen as study objects to analyze the effects of E2 on the production of methane and carbon dioxide. Microecological systems in anaerobic pore water were constructed in the laboratory. The results show that E2 played an enhancing role in methanogenic activity when the concentrations were ≤0.5 ng/L. The enhancement was the strongest at 0.3 ng/L. However, when the E2 concentration exceeded 1.0 ng/L, it inhibited the methanogenic activities of bacteria. The inhibition effect persisted for up to 264 h, beyond which the trend became unclear. On the other hand, E2 has an inhibition effect on CO₂ production in anaerobic sediments, which indicates that E2 had a significant inhibition effect on microbial activities under anaerobic conditions. Based on these experiments, the authors believe that E2 in anaerobic sediments can affect sediment microbial activities and therefore influence the self-purification of water bodies and methane ebullition.
雌激素 17β-雌二醇（E2）是分布最广泛的天然雌激素之一，也是环境中最有效的雌激素。在本研究中，产甲烷菌群落被选为研究对象，以分析 E2 对甲烷和二氧化碳生成的影响。实验室中构建了厌氧孔隙水微生态系统。结果表明，当浓度≤0.5ng/L 时，E2 对产甲烷活性表现出促进作用。在 0.3ng/L 时，增强作用最强。然而，当 E2 浓度超过 1.0ng/L 时，它会抑制细菌的产甲烷活性。这种抑制作用持续了长达 264 小时，之后趋势变得不明显。另一方面，E2 对厌氧沉积物中的 CO₂ 生成有抑制作用，这表明 E2 在厌氧条件下对微生物活性有显著的抑制作用。基于这些实验，作者认为，厌氧沉积物中的 E2 可以影响沉积物微生物的活性，从而影响水体的自净能力和甲烷排放。
