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本文研究了moso-四(N-甲基-3-吡啶基)卟啉和铁的络合物作为辣根过氧化物酶的模拟酶催化过氧化氢氧化高香草酸的荧光反应的性能。拟订了用模拟酶催化测定H_2O_2和葡萄糖的荧光测定方法。其检出下限分别为1.1×10~(-7)mol/LH_2O_2和0.2μgml~(-1)葡萄糖。对血清中葡萄糖的含量进行了测定,结果令人满意。通过动力学研究,比较了该模拟酶与辣根过氧化物酶及其它模拟酶催化活性的相对大小。 相似文献
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毛细管固定过氧化物酶流动注射化学发光法测定过氧化氢的研究 总被引:8,自引:2,他引:6
利用固定有辣根过氧化物酶的毛细管柱作为反应器与流通池,建立了一种简单、快速检测过氧化氢的流动注射化学发光分析新方法.当鲁米诺和过氧化氢的混合溶液流经反应器时,辣根过氧化物酶催化过氧化氢氧化鲁米诺产生化学发光.在选定的实验条件下,化学发光信号与过氧化氢的浓度在3.0×10-8~1.0×10-4mol/L范围内分段呈线性关系,检出限为1×10-8mol/L(S/N=3),相对标准偏差1.4%(1.0 μmol/L,n=9).该方法用于雨水中过氧化氢的测定,结果满意. 相似文献
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壳聚糖/聚乙烯吡咯烷酮固定辣根过氧化物酶的过氧化氢生物传感器 总被引:4,自引:0,他引:4
用一种新型的壳聚糖(CS)/聚乙烯吡咯烷酮(PVP)复合膜在玻碳电极(GCE)上固定辣根过氧化物酶(HRP)。以乙二醛作交联剂,二茂铁(Fc)作媒介体,制备过氧化氢生物传感器。红外光谱表明:CS与PVP交联形成了一种新的高聚物,实验结果证明该聚合物适合辣根过氧化物酶的固定。该传感器对于H2O2的电流响应在5 s内即可达到最大,线性范围为6.0×10-6~1.7×10-4mol/L;检出限为2.5×10-6mol/L。该传感器的检测灵敏度为62.5μA/mmol/L。 相似文献
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制备了辣根过氧化物酶功能化金簇,在弱碱性介质中,激发波长和发射波长为425 nm/628 nm;过氧化氢能够使得金簇荧光发生猝灭,在体系中加入适量多巴胺,荧光猝灭程度减弱,且减弱程度与加入多巴胺的量呈正比;多巴胺在0.04~8.0μmol/L内呈线性,其线性回归方程为:AF= 10.01 +43.28c(μmol/L)... 相似文献
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血红蛋白与葡萄糖氧化酶偶联荧光法测定葡萄糖 总被引:9,自引:1,他引:9
利用血红蛋白(Hb)作为辣根过氧化物酶(HRP)的模拟酶,催化H2O2与对甲基酚的荧光反应.并将该反应与葡萄糖氧化酶(GOD)催化氧化葡萄糖的反应偶联,建立了测定葡萄糖的荧光分析法.方法的线性范围为0.0~5.0×10-5mol/L葡萄糖.检测限为6.5×10-8mol/L.用于测定人血清中葡萄糖的含量,获得了满意的结果. 相似文献
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利用细胞色素c与Nafion,通过自组装方式,构建了纳米簇模拟过氧化物酶;利用电子透射显微镜、圆二色谱仪、紫外可见光分光光度仪及电化学工作站等设备测量模拟酶结构变化、酶促动力学参数以及电化学特性;在50 mmol/L Na2HPO4-NaH2PO4缓冲溶液(pH 10.0)中,测得模拟酶米氏常数Km、催化速率及催化效率分别为2.5 μmol/L、0.069 s-1、0.028±0.005(μmol/L)-1s-1,其催化效率为天然辣根过氧化物酶的39%±5%,该模拟酶具有很好的稳定性和活性,能够替代辣根过氧化物酶.该模拟酶可以固定在功能化多壁纳米管与纳米金复合材料修饰玻碳电极上,在50 mmol/L Na2HPO4-NaH2PO4缓冲溶液(pH 7.0)中测得模拟酶与电极之间电子迁移速度常数k8为0.65 s-1.利用循环伏安法测量模拟酶催化浓度为0.02~10 nmol/L的H2O2,其阴极峰电流随H2O2浓度增加而增大,并且得出模拟酶催化H2O2检出限为0.05 nmol/L,电化学表观米氏常数Kmapp为2.3×10-10 mol/L. 相似文献
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本文结合层层组装法和电化学聚合法,制备了电子介体聚亚甲基蓝(PMB)修饰的碳纳米管(CNTs)/辣根过氧化物酶(HRP)多层膜有机过氧化物传感器。利用电化学阻抗表征了(CNTs/HRP)n的层层组装过程,探讨了不同HRP层数对传感器响应的影响,并研究了传感器对有机过氧化物过氧化氢叔丁基、过氧化氢异丙基苯的电催化还原性能。该传感器对过氧化氢叔丁基的线性检测范围为1.75×10-5~7.25×10-3mol/L,检测限为1.36×10-6 mol/L;对过氧化氢异丙基苯的线性检测范围为3.87×10-6~1.47×10-3 mol/L,检测限为6.48×10-7 mol/L。 相似文献
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Martin Sahlberg Yvonne Andersson 《Acta Crystallographica. Section C, Structural Chemistry》2009,65(3):i7-i8
Scandium magnesium gallide, Sc2MgGa2, and yttrium magnesium gallide, Y2MgGa2, were synthesized from the corresponding elements by heating under an argon atmosphere in an induction furnace. These intermetallic compounds crystallize in the tetragonal Mo2FeB2‐type structure. All three crystallographically unique atoms occupy special positions and the site symmetries of (Sc/Y, Ga) and Mg are m2m and 4/m, respectively. The coordinations around Sc/Y, Mg and Ga are pentagonal (Sc/Y), tetragonal (Mg) and triangular (Ga) prisms, with four (Mg) or three (Ga) additional capping atoms leading to the coordination numbers [10], [8+4] and [6+3], respectively. The crystal structure of Sc2MgGa2 was determined from single‐crystal diffraction intensities and the isostructural Y2MgGa2 was identified from powder diffraction data. 相似文献
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Marina I. Naumova Natalia V. Kuratieva Nina V. Podberezskaya Dmitry Yu. Naumov 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(5):i53-i55
The structures of the hypophosphites KH2PO2 (potassium hypophosphite), RbH2PO2 (rubidium hypophosphite) and CsH2PO2 (caesium hypophosphite) have been determined by single‐crystal X‐ray diffraction. The structures consist of layers of alkali cations and hypophosphite anions, with the latter bridging four cations within the same layer. The Rb and Cs hypophosphites are isomorphous. 相似文献
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Paul-Louis Fabre Dominique de Montauzon René Poilblanc 《Transition Metal Chemistry》1987,12(5):434-440
Summary The ability of [MoS4]2–, anions to be used as ligands for transition metal ions has been widely demonstrated, especially with Fe2+. The present study has been restricted to linear complexes such as (NEt4)2 [Cl2FeS2MoS2] and (NEt4)2[Cl2FeS2MoS2FeCl2]. Their electrochemical properties are described: upon electrochemical reduction, these compounds yield MoS2, as a black precipitate, and an iron complex in solution, assumed to be [SFeCl2]2–. The electrochemical reduction goes through two electron transfers, coupled with the breakdown of the molecular skeleton: a DISPl and an ECE mechanism. Depending on the solvent, the following equilibrium may be observed: [Cl4Fe2MoS4]2–[Cl2FeMoS4]2–+FeCl2. The equilibrium constant, KD, was evaluated by differential pulse polarography. KD is tightly related to the donor number of the solvent. 相似文献
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On Dialkali Metal Dichalcogenides β-Na2S2, K2S2, α-Rb2S2, β-Rb2S2, K2Se2, Rb2Se2, α-K2Te2, β-K2Te2 and Rb2Te2 The first presentation of pure samples of α- and β-Rb2S2, α- and β-K2Te2, and Rb2Te2 is described. Using single crystals of K2S2 and K2Se2, received by ammonothermal synthesis, the structure of the Na2O2 type and by using single crystals of β-Na2S2 and β-K2Te2 the Li2O2 type structure will be refined. By combined investigations with temperature-dependent Guinier-, neutron diffraction-, thermal analysis, and Raman-spectroscopy the nature of the monotropic phase transition from the Na2O2 type to the Li2O2 type will be explained by means of the examples α-/β-Na2S2 and α-/β-K2Te2. A further case of dimorphic condition as well as the monotropic phase transition of α- and β-Rb2S2 is presented. The existing areas of the structure fields of the dialkali metal dichalcogenides are limited by the model of the polar covalence. 相似文献
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[reaction: see text] Fluoranthene 2 and heptacycle 3 are easily accessible from the reaction of diyne 1 and norbornadiene (NBD) in the presence of the rhodium catalyst. The unusual [(2+2)+(2+2)] adduct 3 was confirmed by the X-ray crystal structure analysis. 相似文献
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[(n‐Bu)2Sn(O2PPh2)2] ( 1 ), and [Ph2Sn(O2PPh2)2] ( 2 ) have been synthesized by the reactions of R2SnCl2 (R=n‐Bu, Ph) with HO2PPh2 in Methanol. From the reaction of Ph2SnCl2 with diphenylphosphinic acid a third product [PhClSn(O2PPh2)OMe]2 ( 3 ) could be isolated. X‐ray diffraction studies show 1 to crystallize in the monoclinic space group P21/c with a = 1303.7(1) pm, b = 2286.9(2) pm, c = 1063.1(1) pm, β = 94.383(6)°, and Z = 4. 2 crystallizes triclinic in the space group , the cell parameters being a = 1293.2(2) pm, b = 1478.5(4) pm, c = 1507.2(3) pm, α = 98.86(3)°, β = 109.63(2)°, γ = 114.88(2)°, and Z = 2. Both compounds form arrays of eight‐membered rings (SnOPO)2 linked at the tin atoms to form chains of infinite length. The dimer 3 consists of a like ring, in which the tin atoms are bridged by methoxo groups. It crystallizes triclinic in space group with a = 946.4(1) pm, b = 963.7(1) pm, c = 1174.2(1) pm, α = 82.495(6)°, β = 66.451(6)°, γ = 74.922(6)°, and Z = 1 for the dimer. The Raman spectra of 2 and 3 are given and discussed. 相似文献
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Photoionization Mass Spectra of SCl2, S2Cl2, and S2Br2 Photoionization mass spectra of SCl2, S2Cl2, and S2Br2 have been measured. Heats of formation, bond energies, and ionization potentials of fragments have been calculated from appearance potentials. 相似文献