铜绿微囊藻去除环境内分泌干扰物17β-雌二醇的研究

Study of the removal of environmental endocrine disruptor 17β-estradiol by Microcystis aeruginosa

环境内分泌干扰物作为一类新型污染物已经日益引起人们的关注.其中内源性雌激素17β-雌二醇(E2)因其强烈的雌激素效应,对人类和生态系统构成巨大的威胁.藻类作为初级生产者,在生态环境中扮演重要的角色,同时也能与污染物的相互作用.以铜绿微囊藻(Microcystis aeruginosa)为对象,研究了E2对铜绿微囊藻生长速率的影响,并且探讨E2在藻悬浮液中的生物降解.结果表明:在0.5～4.0mg/L浓度范围内,E2对铜绿微囊藻的生长有一定的促进作用,且该促进作用随浓度增加而增强;另一方面,铜绿微囊藻对E2具有较好的去除效果,并且其降解过程遵循一级动力学.在有铜绿微囊藻存在时,E2的半衰期约为2.0天,而对照条件下E2的半衰期为39.6天.因此,铜绿微囊藻对水体中E2的生物转化起着重要作用,能有效的去除水体中该类污染物.

Environmental endocrine disrupters,as emerging pollutants,have been received increasing attention.17β-estradiol（E2） is an endogenous estrogen which possesses strong estrogen effect,results in severely reverse risk to human health and ecological safety.Algae,as a primary producer,play an important role in the eco-environment,and can interact with contaminants.M.aeruginosa was used as a model organisms to research its growth effect by E2 and the biodegradation of E2 in M.aeruginosa suspension.The results indicated that E2 at all concentration in study can stimulate the growth of M.aeruginosa.On the other hand,M.aeruginosa possesses an excellent capacity in removing E2,and the degradation process fallowed the first-order kinetics.In the presence of M.aeruginosa,the evaluated half-life was about 2 days compared to the control of 39.6 days.Therefore,M.aeruginosa plays an important role in the removal of E2 in aquatic environment.