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23120021()JournalofJiangsuUniversity(NaturalScience)Vol.23No.1Jan.2002E,,(,212013)[]E,,,,,1E,,E,1,,,1[]E;;[]Q566[]A[]1007-1741(2002)01-0054-04E(),,8,,,1111Fig.1ChemicalstructureoftocopherolsE,,212d2,,E2,dl2,d221/3[1],2,,1993,E15kg[2]1E,,,,,,:;;;;;;;;;;1,,,11E,,1FeCl3Ce(SO4)2HNO3,[3]:2EFig.2TheoxidativereactionofvitaminE[]2001-10-16[](97029901);(BK99112)[](1963-),,,,1©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.(1),E,,Ce4+,E,,1(2)Fe3+E,Fe2+2,E11,102(phen),E,,C[4]1Adenity325.62(42)21.2.32(Ferrozine)phen,,,562nm[Fe2+(Ferrozine)3]4-5622.8104L/(molcm),phen5101.12104L/(molcm)1E,E1SastryE,2H2SO42h,ECCl4,HNO3,422N,N2CCl4,620nm,E1,EE1SzymazaE,(DPPH)E,522nmDPPHA,AE,1,E,,,Sastry,N2E,,520nm111.095.0g/mL1,,1E,[56][7][8]12E,,2nm,E1E,1E,,E100g/mL,,E[9]1,E,,,,E1NaOH,[10]1E,,E1Ex340nmEm480nmEx295nmEm340nmAE,E90.7%95.9%[11],,E,99.2%[12]13E,[13],,,,,,,1,1Tai2sunshin[14]E,12.22(98.50.90.850.1),,830min,18:22551:E©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.2222221,2.22,,1EHPLC,,[13]HPLCEHPLC(1)11HPLCETab.1HPLCsystemsusedinvitaminEdetermination25msiDiol-(496)Ex295nmEm330nmCoorsandMontag22-,,HPLC,5mLiChrosorbSI60(Merck)-(595)-(0.299.8)Ex290nm,Em330nmUV295nmThompsonHatina225mPolygosil60-5(Machery)-(1090)1mg/mLBHTEx295nmEm320nmSpeek2,Porasil(waters)-(1585)UV280nmWidicuskirk22,ZorbaxODA(Dupont)--UV265nmBarntee22,5mChromegasphereSI6022,2,42(2.597.5)Ex294nmEm325nmCores225mLiChrosorbSI60(Merck)-(496)Ex285nmEm330nmVanNickerburger2,-BondapakC18-(955)UV290nm2,NOVA-PAK-(982)UV292nm2Porasil-(99.50.5)UV280nm2--(937)Ex298nmEm325nm-,soppakMporasil-(99.10.9)UV292nm4E,,1EE,HPLC1AmyEClough[15],E,1E,Cu=(i1VCs)/[i2Vs+(i2-i1)Vu]E,CuE,CsE,i1i2E,Vs,Vu1,,E20mg/L2E,HPLC15[16]E,1Ce(SO4)2,E,1NH3H2O2,-0.29V,E1.210-54.510-1mol/L1,4.53E,65()23©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.E,1E,,E1[17]E16[18](2991)50510min,E,:SE-5430m0.25mm,0.25m,,150,10/min300,15min,340,,1100,N2,1.2mL/min,40min,E,96.7%,RSD(n=5)1.1%,,2E17E,,,,,1,,,1,,,,;,;,E,E,,E1[][1],,1E[J]1,1993(1):94-1011[2]SureshRamamurthi,AlanRMcCurdy1EnzymenticPretrementofDeodorizerDistillateforConcentrationofSterolsandTocopherols[J]1JournalofAmericanOilChemistsSociety,1993,70(3):57-601[3],1E[J]1,1994(7):390-3931[4],1E[J]1,1990(8):14-161[5],,1EE[J]1,1995(2):42-451[6],,1E[J]1,1999(6):18-211[7],1E[J]1,2000(2):21-231[8]El2WalilyAF,El2AnwarF,ZamelS.ThirdDerivat2iveSpectrophotometricSimultationDeterminationofVitaminsAandEinSomePharmaceuticalPrep2ar2tions[J].AnalChimActa,1991,248(2):583-5861[9],1E[J]1,1986(6):37-391[10],1E:[J]1,1986(7):43-451[11]1EA[J]1,1990(10):46-491[12]1E[J]1,1993(3):51-541[13],1E[J]1,2000(6):57-591[14]Tai-SunShin,SamuelGodberJ.ImprovedHigh2PerformanceLiquidChromtographyofVitaminEVitaminersonNormal2PhaseColumn[J].JAOCS,1993,70(12):1289-12911[15]AmyEClough1TheDeterminationofTocopherolsinVegetableOilsbySquareWaveVoltammetr[J]1JAOCS,1992,69(5):456-4601[16],,1E[J]1,1999(4):24-281[17],,1E[J]1,1999(4):32-351[18],1[J]1,1994(5):61-621[19]1(2)[M]1:,19971(74)751:E©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.[][1].[M].:,1995.[2],,,1[M].:,1983.[3],,,1()[M].:,1998.[4]ZhangRH,NakazawaT,LmaF.EstimationofD2epthofConcreteCar2Bonation[J]1ConcreteUrability,1998,11(6):633-674.[5],,.[J].(),2000,21(6):111-116.AServiceLifeModelforPrestressedStructureDesignXULi1,YANGXiao2ping2,LIURong2gui2,JIANGXiao2yun(1.FacaltyofScience,JiangsuUniversity,Zhenjiang,Jiangsu212013,China;2.CapitalConstructionDepartment,JiangsuUniversity,Zhen2jiang,Jiangsu212013,China)Abstract:Manyresearchresultsaboutdurabilityofordinaryreinforcementconcretestructure(RC)areobtained.Althoughtheproblemsofdurabilityofprestressedconcretestructures(PC)aresimilartothoseofRC,theyhavesomedistinctivefeatures.Thecharacteristicsofstresscorrosioncrackofprestressedrein2forcementintheprestressedconcretestructurearepresented,andthedifferencesoftheservicelifebetweenprestressedconcretestructureandordinaryconcretestructurearediscussed.Then,aservicelifemodelfortheprestressedconcretestructuresubjectedtocarbonationisdevelopedusingtheequationofcarbonationdepthbasedonthecarbonationprocess.Keywords:prestressedstructure;servicelife;stresscorrosion;carbonation()(57)ResearchProgressinDeterminationMethodsofVitaminEFANMing2tao,WUShou2yi,MAHai2le(SchoolofBiologicalandEnvironmentalEngineering,JiangsuUniversity,Zhenjiang,Jiangsu212013,China)Abstract:VitaminEstructureiscomplexandhasmanyisomers;therefore,itisdifficulttodetermineit.Theresultsobtainedwiththeseveralexistingdeterminationmethodshavedifferences,soitisurgenttofindastandardmethodwhichisfast,accurateandconvenient.Inthispaper,thevitaminEdeterminationprinciples,samplepretreatmentandprocedure,detectinglimitandsensitivityofspectrophotometry,fluo2rometry,highpressureliquidchromatography,square2wavevoltammetryandoscillographicpolargraphyarereviewed.Differentisomersidentifiedbydifferentmethods,theadvantagesanddisadvantagesandapplica2tionfieldsarealsodiscussed.Theproblemsatpresent,theresearchdirectionandfocusforthefuturehavebeenputforward.Keywords:vitaminE;deter