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《纳米和微米ZnO对鲫鱼的毒性效应研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、南京大学学报(自然科学)第50卷第4期Vo1.50,No.4JOuRNALOFNANJINGUNIVERSITY2014年7月July,2014(NATURALSCIENCES)DOI:10.13232/j.cnki.jnju.2014.04.006纳米和微米ZnO对鲫鱼的毒性效应研究胡正雪,刘林,郭红岩,尹颖(南京大学环境学院,污染控制与资源化研究国家重点实验室,南京,210023)摘要:以鲫鱼Carassiusauratus为实验生物,采用电子顺磁共振等多种检测手段,比较研究了纳米和微米ZnO腹腔注射14d后,其在鲫鱼肝脏和脑部的分布情况以及毒性效应
2、.研究发现,相同浓度的纳米和微米ZnO作用下,纳米zn0处理组肝脏和脑部zn含量高于微米ZnO处理组;纳米znO对肝脏羟基自由基,肝脏和脑部MDA及GSH的诱导率高于微米ZnO;纳米ZnO对肝脏和脑部SOD活性的抑制作用也高于微米ZnO.但不同浓度纳米ZnO对羟基自由基和MDA的诱导效应及对SOD活性的抑制作用并未随浓度的升高而线性增加.结果表明:相比于微米ZnO,纳米ZnO更易进入肝脏和脑部,进而产生更强的毒性效应.但纳米ZnO的毒性并没有随浓度升高而线性增加.关键词:纳米Zn0,微米ZnO,活性氧,脂质过氧化物,抗氧化系统ToxicityofNano
3、andMicroZnOonCarassiusauratusHuZhengxue,LiuLin,GuoHongyan,YinYing(StateKeyLaboratoryofPollutionControlandResourcesReuse,SchoolofEnvironment,NanjingUniversity,Nanjing210023,China)Abstract:NanoZnOhasattractedincreasingconcernsbecauseofitswidespreaduseanduniquetoxicpotentia1.Whi1e,s
4、ofarmostresearchesfocusedontheconcentrationeffectsbutnotthesizeeffectsofNanoZnO.ThepurposeofthisstudywastocomparethetoxiceffectsofNanoZnOandMicroZnOtOCarassiusauratus.FourteendaysaftertheintraperitonealinjectionofNanoZnO(1,12.5,50mgZnO/kg)andMicroZn0(12.5mgZnO/kg),thedistribution
5、andtoxiceffectsofNanoandMicroZnOonCarassiusauratusliverandbrainwerestudied.TheparticlesizeofbothNanoandMicroZnOwasdeterminedbytransmissionelectronmicroscopy(TEM).Andthefreeradicals(·0H)generationwasdeterminedbyelectronparamagneticresonance(EPR).Severalantioxidantbiomarkerssuchass
6、uperoxidedysmutase(S0D),glutathionetransferases(GST),glutathione(GSH)andma10ndia1dehyde(MDA)weremeasured,andtheeffectsofNanoandMicroZnOonZncontentinliverandbrainofC.auratuswerealsodetected.WefoundthatbothNanoandMicroZnOcouldinducetheproductionof·OH.AscomparedtoMicroZnO,exposureto
7、12.5mgZnO/kgNanoZnOcausedmoreaccumulationof·OHintheliverofC.auratus.Accordingly,NanoZn0inducedthesynthesisofMDAandsuppressedtheS0DactivitiesintheliverandbrainofC.auratus.Further,NanoZnOeffectsonGSHweremuchhigherthanthoseofMicroZnO,suggestingmoresevereoxidativestresscausedbyNanoZn
8、Ounderthesameconcentration.Thecontentsof
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