简介：在模拟人体生理条件下，采用紫外光谱法、荧光光谱法、DNA热变性及黏度法研究欧前胡素及同分异构体异欧前胡素与DNA的作用机制，并探讨其构效关系．紫外光谱表明，加入DNA后，欧前胡素和异欧前胡素的紫外光谱均呈现减色效应；荧光光谱显示，随着欧前胡素或异欧前胡素浓度的增大，DNA—BR的荧光被猝灭，表明欧前胡素和异欧前胡素对BR与DNA的结合存在竞争性抑制；盐效应、DNA热变性温度、黏度法等实验进一步证明欧前胡素和异欧前胡素与DNA的作用模式均为嵌插与静电混合作用模式．研究表明，欧前胡素和异欧前胡素均与DNA发生作用，且欧前胡素与DNA作用强于异欧前胡素．

简介：Thetitlecomplex[NH_3CH_2CH(NH_2)CH_3]_2[M(Ⅵ)O_2(OC_6H_4O)_2](M=Mo_(0.6)W_(0.4))wassynthesizedviaasimplesolution-phasechemicalroute.ThedeterminationofsinglecrystalX-raydiffractionrevealedthatthetitlecompoundiscrystallizedinamonoclinicsystemwithP2(1)/nspacegroup,a=1.0913(10)nm,b=1.0442(10)nm,c=1.8842(19)nm,α=90°,β=96.530(17)°,γ=90°,Z=4,andV=2.133(4)nm3.Themononuclearanionicunit[M(Ⅵ)O2(OC6H4O)2]2-displayschiralpseudo-octahedral[MO_6]coordinationgeometryandislinkedbychiralcationsviahydrogenbondandπ…πstackinginteraction.Thetransmissionelectronmicroscopyimagesshowthatthetitlecomplexiscomprisedofnano-particleswithdiametersrangingfrom20to50nm.TheNMRstudyshowsthe1Hdownfieldchemicalshiftsof[NH_3CHaHbCH(NH_2)CH_3]+cationsinthetitlecomplexwhenitismixedwithadenosine-triphosphate(ATP),andthechemicalshiftdifferencebetweenHaandHbisincreasedgreatly,andmostofthecatecholateligandsdissociatefromthecentralmetalatoms.TheDNAcleavageactivityexperimentrevealsthatDNAcleavagepromotedbythetitlecomplexislowerthanthatbyNa_2MoO_4whichpossessesantitumorpro-perty,buthigherthanthatbyNa_2WO_4.