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Biodegradation Characteristics of environmental endocrine disruptor Di-n-butyl Phthalate

Biomedical and environmental Sciences 2005年第3期18卷 187-191页

作者： LINWANG QI-FANGLUO InstituteofenvironmentalMedicine TongjiMedicalCollegeHuazhongUniversi~ofScienceandTechnologyWuhan430030HubeiChina CorrespondenceshouldbeaddressedtoQi-FangLUO InstituteofEnvironmentalMedicine13HangkongRoadWuhan430030HubeiChina

Objective The biodegradation characteristics of di-n-butyl phthalate (DBP), an environmental endocrine disruptor, were studied by the method of dominant bacteria and immobilized microorganisms. Methods Taking DBP as the only carbon source to acclimatize the collected activated sludge, the concentration of DBP increased progressively in the process of acclimatization. Plate streaking was used to separate 1 strain of the degradation dominant bacteria after acclimatization. Better conditions to degrade DBP by the bacterium could be obtained through orthogonal experiments and the bacterium was identified. Then the acclimated activated sludge was made to immobilize the microorganism using polyvinyl alcohol as entrapment agent. The immobilized microorganism degraded DBP at different conditions. Results The appropriate conditions to degrade DBP by the dominant bacteria were: degradation time, 32 h; DBP concentration, 200 mg/L; rate of shaking incubator, 100 r/min; pH, 7 and temperature, 30℃. DBP could be degraded by more than 95% under such conditions. The bacteria were identified as pseudomonas. The proliferated immobilized microorganisms degraded DBP more effectively and more adapted to temperature and pH than the free acclimated activated sludge. Conclusion One strain of DBP degradation dominant bacteria was separated from the acclimatized activated sludge. It could grow with DBP as the only carbon source and energy, and degraded DBP effectively. After having been immobilized and proliferated, the dominant bacteria could keep a higher biological activity and degrade DBP more effectively than activated sludge.

关键词： environmental endocrine disruptor Di-n-butyl phthalate Biodegradation Degradation dominant bacteria Immobilized microorganism

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Phthalate Exposure and Human Semen Quality in Shanghai:A Cross-sectional Study

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Biomedical and environmental Sciences 2006年第3期19卷 205-209页

作者： YUN-HUI ZHANG LI-XING ZHENG BING-HENG CHEN Department of environmental Health School of Public Health Fudan University Shanghai 200032 China

Objective To monitor the level of phthalates in human semen samples and to analyze the relationship between phthalate levels and semen parameters. Methods Concentrations of three kinds of commonly used phthalates （di-ethyl phthalate, DEP; di-n-butyl phthalate, DBP; di-2-ethylhexyl phthalate, DEHP） were measured using reversed-phase HPLC. Semen parameters were measured by computer aided sperm analysis （CASA）. Results The three phthalates were detected in most of the biological samples, with median levels of 0.30 mg/L （0.08-1.32 mg/L） in semen specimens. There was a significant positive association between liquefied time of semen and phthalate concentrations of semen. The correlation coefficient was 0.456 for DEP, 0.475 for DBP, and 0.457 for DEHP, respectively. There was no significant difference between phthalate concentrations of semen and sperm density or livability, though the correlation coefficients were negative. Conclusion These results suggest that people who reside in Shanghai are exposed to phthalates, especially to DBP and DEHP. Although the level of phthalates is relatively mild, an association of phthalate levels and reduced quality of human semen has been shown in the present study.

关键词： environmental endocrine disruptor Phthalates Reversed-phase HPLC Biological samples

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