基因在染色体上ppt

(自然科学版)373JournalofSouthChinaUniversityofTechnologyVol.37　No.320093(NaturalScienceEdition)March　2009文章编号:1000-565X(2009)03-0085-05　　收稿日期:2008-02-26＊基金项目:“”(2006BAD05A02);2006(20060107-2);(2006014)　作者简介:(1969-),,,,.E-mail:[e-mail]电场作用下PAN/PS共混膜的特性＊肖凯军1　袁亮1　刘文山1　李琳1　周显宏2　银玉容1(1.,510640;2.,523808)摘　要:以相对分子质量67000的牛血清蛋白为超滤分离对象,通过测定膜通量、截留率、膜通量衰减程度和恢复率等膜参数,研究了外加直流电场作用下聚丙烯腈/聚砜共混膜的分离性能.结果表明:外加正电场时共混膜的膜通量和截留率都有所提高,在外加+120V/cm的电场时,分别提高了85%和1.1%;在外加+60V/cm的电场时,膜通量由57.14%降低到26.33%;经过“电场自洁净”的共混膜其膜通量的恢复率可达到90%以上.因此,外加电场可改变共混膜的分离性能,提高膜通量、截留率以及抗污染性.关键词:牛血清蛋白;电场;聚丙烯腈/聚砜共混膜;分离性能;膜参数中图分类号:TQ028.8　　　　文献标识码:A　　,,.,、,,;,,,,[1-2]./(PAN)(PS),,.,/(PAN/PS),[3].67000,PAN/PS、,.1　材料与方法1.1　材料BSA(67000,);/(6,).1.2　设备和仪器MasterFlex77200-60(ColeParmerIn-strumentCompany);UV-2102PC(UNICO);Synthesis-A10(Millipore).1.3　方法[4]1.3.1　膜通量测定0.2MPa,J:J=VA×t.:J,L/(m2·h);V,L;A(3.848×10-3m2),m2;t,h.1.3.2　膜截留率测定0.2MPa,BSA,R:R=1-ρpρf×100%.:R,%;ρfBSA,g/L;ρpBSA,g/L.1.3.3　膜通量恢复率测定:Hv=JtJ0×100%:Hv,%;J0,L/(m2·h);Jt,L/(m2·h).1.3.4　膜通量衰减率测定,J0,BSA,J0′.M,M=J0-J′0J0×100%.2　实验与讨论2.1　电场对牛血清蛋白超滤的膜通量影响25℃、0.2MPa,1.5g/LpH6.8,-120、-90、-60、-30、0、+30、+60、+90、+120V/cmPAN/PS,1.1　Fig.1　Effectofelectricfieldonmembraneflux　　,Jp,,2.　　12,2　Fig.2　Effectofelectricfieldonaveragemembraneflux.pH6.8BSA,.,10min,50min;,-30V/cm,60min17.3%.,,.-90V/cm,26L/(m2·h),,45.8%.　　Yukawa[5]1983,,,:J=klnρg-ρpρb-ρp+μEE.:k,ρg,ρp,ρb,μE,E..-30～+60V/cm,,;[6](-30V/cm+60V/cm),BSA,,.　　BSA3,3,BSA,,3　Fig.3　Effectofelectricfieldonmembraneretention86(自然科学版)37,+60V/cm,.,,.,-90V/cm,92.8%,96.6%.　　、.BSA.,92%,96.6%98.5%,.,BSApH4.7,pH6.8,BSA,,,BSA.,BSA,,,.,.,BSA,,“”[7],.,,,,.,,.2.2　料液pH值对电场超滤牛血清蛋白效果的影响25℃、0.2MPa,pH6.82.0PAN/PS45,1.5g/LBSA.　　4、5,BSApH6.8,BSA.+120V/cm,89.2L/(m2·h),,85%.4　pHFig.4　EffectofpHvalueonmembraneflux5　pHFig.5　EffectofpHvalueonmembraneretention,BSA96.6%97.6%,.BSApH2.0,,.,pH6.8pH2.0BSA.BSA,.(pH4.7),BSA.pH.pH2.0pH6.8,PAN/PS.PAN(CN),,PAN,,[8].,PANCNPSOSOONSOOSOC[9],,,,.,,.2.3　电场作用下膜通量的恢复25℃、0.2MPa,1.5g/LpH6.8BSA,PAN/PS-60V/cm20min,,.+60V/cm20min,“”,20min,,1.3,3,95.5%、93%92%,“”.　　1,+60V/cm,57.14%26.33%,79.76%84.82%,.87　3:PAN/PS1　Table1　Decreaseandrecoveryratesoffluxunderelectricfields/(V·cm-1)J0/(L·m-2·h-1)J′0/(L·m-2·h-1)Jt/(L·m-2·h-1)M/%Hv/%+6011282.59526.3384.82011248.08957.1479.76-6011235.09068.7578.57,,,.　　“”[10],BSA,,,.,,,.,,BSA,,.,,.3　结论(1)PAN/PSpH6.8.,.+120V/cm,92%,10min,50min.96.6%98.5%.,.(2)pHBSA、,,.(3),PAN/PS90%.,,“”.参考文献:[1]　WalkmanRJ,TarletonES.Anexperimentalstudyofelectroacousticcrossflowmicrofiltration[J].TransactionsoftheInstitutionofChemicalEngineers,1991,69(3):386-397.[2]　HuotariHM,TragardhG,HuismanH.Crossflowmem-branefiltrationenhancedbyanextremalDCelectricfield:areview[J].TransactionsoftheInstitutionofChemicalEngineers,1999,77(8):461-468.[3]　,,./[J].,2008,34(2):21-23.XiaoKai-jun,ShiHao,LiuWen-shan.PreparationandcharacterizationofultrafiltrationmembranewithPAN/PSblended[J].TechnologyofWaterTreatment,2008,34(2):21-23.[4]　,,,.[J].,2006,32(11):24-26.LuoYuan-hong,XiaoKai-jun,LouYa-qing,etal.Ultrafil-trationperformanceofchargedmembraneforpolysaccha-ridesolutionunderexternalelectricfield[J].TechnologyofWaterTreatment,2006,32(11):24-26.[5]　YukawaH,ShimuraK.Crossflowelectro-ultrafiltrationforcolloidalsolutionofprotein[J].JournalofChemicalEn-gineering,1983,16(4):305-311.[6]　ChuangCJ,FangCW,TungKL.Electro-microfiltrationofcolloidalsuspensions[J].SeparationScienceandTechnology,2003,38(4):797-816.[7]　JagannadhSN,MuralidharaHS.Electrokineticsmethodstocontrolmembranefouling[J].IndustrialEngineeringChemistryResearch,1996,35(4):1133-1140.[8]　KimIC,YunHG,LeeKH.Preparationofasymmetricpolyacrylonitrilemembranewithsmallporesizebyphaseinversionandpost-treatmentprocess[J].JournalofMembraneScience,2002,199(5):75-84.[9]　,.-[J].,2005,25(2):34-37.SongLai-zhou,MengChun-jiang.StudyofPES/PANblendingmembrane[J].MembraneScienceandTechnolo-gy,2005,25(2):34-37.[10]　IritanIE,MukaiY,KiyotomoY.Effectsofelectricfieldondynamicbehaviorsofdead-endinclinedanddown-warduItrafiltrationofproteinsolution[J].JournalofMembraneScience,2000,164(10):51-57.88(自然科学版)37PerformancesofPAN/PSBlendMembraneUnderActionofElectricFieldXiaoKai-jun1　YuanLiang1　LiuWen-shan1　LiLin1　ZhouXian-hong2　YinYu-rong1(1.ResearchInstituteofLightIndustryandChemicalEngineering,SouthChinaUniversityofTechnology,Guangzhou510640,Guangdong,China;2.DepartmentofChemicalandBiochemicalEngineering,DongguanUniversityofTechnology,Dongguan523808,Guangdong,China)Abstract:Theseparationperformancesofpolyacrylonitrile/polysulphone(PAN/PS)blendmembraneundertheactionofanexternalDCelectricfieldwereinvestigatedbymeasuringthemembraneflux,theretentionrateaswellasthedeclineandrecoveryoftheflux,withbovineserumalbumin(67000inrelativemolecularmass)astheultra-filtrationobject.Theresultsshowthatboththefluxandtheretentionrateoftheblendmembraneincreaseinanex-ternalpositiveelectricfield,thatthefluxandtheretentionrateincreaserespectivelyby85%andby1.1%in+120V/cmelectricfield,thatthefluxdecreasesfrom57.14%to26.33%in+60V/cmelectricfield,andthatthefluxrecoveryratereachesmorethan90%duet