江西农业大学学报
江西農業大學學報
강서농업대학학보
ACTA AGRICULTURAE UNIVERSITATIS JIANGXIENSIS
2014年
1期
238-242
,共5页
成婕%谢尔瓦妮古丽·苏来曼%邓祥元%崔思宇%刘孟姣%邓美琳
成婕%謝爾瓦妮古麗·囌來曼%鄧祥元%崔思宇%劉孟姣%鄧美琳
성첩%사이와니고려·소래만%산상원%최사우%류맹교%산미림
纳米二氧化钛%斜生栅藻%毒性效应
納米二氧化鈦%斜生柵藻%毒性效應
납미이양화태%사생책조%독성효응
nano-titanium dioxide%Scenedesmus obliquus%toxic effects
为了研究纳米二氧化钛( TiO2)对微藻的毒性效应,以斜生栅藻( Scenedesmus obliquus)为材料,分析了纳米TiO2对S.obliquus生长、叶绿素a含量、超氧化物歧化酶(Superoxide Dismutase,SOD)活力及丙二醛(Malondial-dehyde,MDA)含量等的影响。结果表明:纳米TiO2在低浓度(<5 mg/L)时可促进斜生栅藻的生长及叶绿素a的合成,但在高浓度(>10 mg/L)下具有抑制作用。低浓度纳米TiO2可诱导藻细胞合成SOD,抵御纳米TiO2的胁迫;但在高浓度时又会使SOD活力降低。随着纳米TiO2浓度的升高,藻细胞中MDA含量显著增加,表明细胞中活性氧自由基( Reactive oxygen species ,ROS)过量积累,这将破坏藻细胞的膜结构与功能,使细胞遭受严重损伤,表明纳米TiO2可能通过破坏藻细胞膜的结构与功能来抑制微藻的生长繁殖。研究认为:一定浓度的纳米TiO2可抑制微藻生长,从而改变水生生态系统的群落结构,并对水体环境造成潜在的危害,因此,相关部门在制定纳米TiO2的安全标准时应加以考虑。
為瞭研究納米二氧化鈦( TiO2)對微藻的毒性效應,以斜生柵藻( Scenedesmus obliquus)為材料,分析瞭納米TiO2對S.obliquus生長、葉綠素a含量、超氧化物歧化酶(Superoxide Dismutase,SOD)活力及丙二醛(Malondial-dehyde,MDA)含量等的影響。結果錶明:納米TiO2在低濃度(<5 mg/L)時可促進斜生柵藻的生長及葉綠素a的閤成,但在高濃度(>10 mg/L)下具有抑製作用。低濃度納米TiO2可誘導藻細胞閤成SOD,牴禦納米TiO2的脅迫;但在高濃度時又會使SOD活力降低。隨著納米TiO2濃度的升高,藻細胞中MDA含量顯著增加,錶明細胞中活性氧自由基( Reactive oxygen species ,ROS)過量積纍,這將破壞藻細胞的膜結構與功能,使細胞遭受嚴重損傷,錶明納米TiO2可能通過破壞藻細胞膜的結構與功能來抑製微藻的生長繁殖。研究認為:一定濃度的納米TiO2可抑製微藻生長,從而改變水生生態繫統的群落結構,併對水體環境造成潛在的危害,因此,相關部門在製定納米TiO2的安全標準時應加以攷慮。
위료연구납미이양화태( TiO2)대미조적독성효응,이사생책조( Scenedesmus obliquus)위재료,분석료납미TiO2대S.obliquus생장、협록소a함량、초양화물기화매(Superoxide Dismutase,SOD)활력급병이철(Malondial-dehyde,MDA)함량등적영향。결과표명:납미TiO2재저농도(<5 mg/L)시가촉진사생책조적생장급협록소a적합성,단재고농도(>10 mg/L)하구유억제작용。저농도납미TiO2가유도조세포합성SOD,저어납미TiO2적협박;단재고농도시우회사SOD활력강저。수착납미TiO2농도적승고,조세포중MDA함량현저증가,표명세포중활성양자유기( Reactive oxygen species ,ROS)과량적루,저장파배조세포적막결구여공능,사세포조수엄중손상,표명납미TiO2가능통과파배조세포막적결구여공능래억제미조적생장번식。연구인위:일정농도적납미TiO2가억제미조생장,종이개변수생생태계통적군락결구,병대수체배경조성잠재적위해,인차,상관부문재제정납미TiO2적안전표준시응가이고필。
The growth,chlorophyll a concentration ,superoxide dismutase ( SOD) activity and malondialde-hyde ( MDA) content of Scenedesmus obliquus under different nano-TiO2 concentrations were analyzed in order to reveal the toxic effects of nano-TiO2 on microalgae .The results showed that 1) low nano-TiO2 concentrations (<5 mg/L) caused an increase of the microalgal growth and chlorophyll a (Chl a) concentration,but high nano-TiO2 concentrations (>10 mg/L) significantly inhibited the growth and Chl a synthesis;2) the activity of SOD was enhanced in low nano-TiO2 treatments,which is viewed as an active defense against environmental stress,like the stress of nano-TiO2;while SOD activity decreased in high nano-TiO2 treatments.3) MDA con-tent in the microalgal cells increased significantly with increasing nano-TiO2 concentrations indicating that ex-cessive accumulation of reactive oxygen species ( ROS) damaged the structure and function of this microalgal cell membrane.Therefore,the microalgal cells suffered serious injury and had a negative growth under the stress of nano-TiO2 .It is suggested that high nano-TiO2 concentrations will inhibit the growth of microalgae ,change community structure of aquatic ecosystems,and cause potential hazard to the aquatic environment.Thus,thesafety of nano-TiO2 should be considered when the government makes the safety standard for using nano -TiO2 in future .