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1.
毛细管电泳—钴钛菁碳糊修饰电极电化学催化氧化测定羟胺和巯基类… 总被引:2,自引:0,他引:2
本文利用自制的毛细管电泳-电化学安培检测装置,以钴钛菁碳糊修饰电极为工作电极。在中性磷酸体系缓冲溶液中,对四种羟胺和巯基类化合物的混合物进行了分离和测定,检测下限羟胺类化合物为5.0×10^-6mol/L巯基类化合物为1.0×10^-5mol/L。对 相似文献
2.
用流动注射法研究巯基化合物-铈(Ⅳ)-氢化可的松的化学发光反应 总被引:1,自引:0,他引:1
采用流动注射法研究了巯基化合物-铈(Ⅳ)-氢化可的松(HCRs)体系的化学发光行 为,对影响化学发光强度的诸因素进行试验和探讨,建立了流动注射化学发光法检测谷胱甘 肽(GSH),半胱氨酸(Cys)等含巯基化合物的新方法。检测GSH和Cys和线性范围分别为 2.0×10-6~10.0×10-5mol/L和1.0×10-6mol/L~10.0×10-5mol/L;检测限分别为2.0 ×10-7mol/L和1.4×10-6mol/L(S/N=3);GSH、Cys加入血清中进行回收测定的回收率 为90%~95%,相对标准偏差小于4%。 相似文献
3.
用流动注射法研究巯基化合物—铈(IV)—氢化可的松的化学发光反应 总被引:5,自引:0,他引:5
采用流动注射法研究了巯基化合物-铈(Ⅳ)-氢化可的松(HCRs)体系的化学发光行为,对影响化学发光强度的诸因素进行试验和探讨,建立了流动注射化学发光法检测谷胱甘肽(GSH),半胱氨酸(Cys)等含巯基化合物的新方法。检测GSH和Cys和线性范围分别为2.0×10^-6 ̄10.0×10^-5mol/L和1.0×10^-6mol/L ̄10.0×10^-5mol/L;检测限分别为2.0×10^-7mol 相似文献
4.
聚吡咯碳糊电极的研制及应用 总被引:6,自引:0,他引:6
研制了聚吡咯电极,探讨了该电极的性能和实用性,实验结果表明,该电极可用于伏安法快速测定L-抗坏血酸,在0.1mol/LKNO3底液中,线性范围为1.0×10^-11~9.0×10^-9mol/L检测限为5.0×10^-12mol/L,电极具有具有良好的重现性和高选择性,响应迅速,使用寿命3个月以上。 相似文献
5.
本以石墨棒为导电基体,以硅钨酸,林可霉素为电活性和的制成了全固态林可霉素离子选择电极。所制电极在1.0×10^-1-5.0×10^-5mol/L浓度范围内有线性响应,斜率为58.3mV/pC,检测下限为2.5×10^-5mol/L。电极响应迅速,具有良好的稳定性,可用于林可霉素含量的快速测定。 相似文献
6.
报道了一种新的L-氨基酸氧化酶电极,这种酶电极系由氨气敏电极和以氨基化玻璃布为载体的酶膜所组成;研究了固定化条件对酶膜活性的影响以及底物浓度、温度和pH对电极响应特性的影响。该电极在6.0×10^-5~4.0×10^-3mol/L的底物浓度范围内呈良好的线性关系,检测下限为5.0×10^-5mol/L。在最宜条件下,酶电极具有良好的稳定性。 相似文献
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以谷氨酸棒状杆菌作为生物催化剂,与基础氨气敏电极结合制成对L-天冬门酰胺响应的微生物电极,在30℃时选择PH=8.5的硼酸缓冲体系,测得电极的线性范围为7.1×10^-5-1.1×10^-2mol/L,斜率为51.4mV/dec,检测下限为2.0×10^-5mol/L,响应时间为4-7min寿命达30d以上。 相似文献
9.
报道了苄氧基甲基-12-冠-3-的合成,并以此化合物作载体研制成锂离子选择电极。用苄氧基甲基-12冠-3-为载体的电极对锂离子响应拇性范围为1.0×10^-1-8.3×10^-5mol/L.检测限为4.2×10^-5mol/L,斜率为57.4mV/pLi。电极具有好的稳定性和重现性。 相似文献
10.
聚氯乙烯膜氧氟沙星和曲马多选择电极的研制与应用 总被引:14,自引:1,他引:14
报道了以氧氟沙星碘化物与碘化铋的分子缔合物为电活性物的新型聚氯乙烯膜氧氟沙星选择电极。并以类似的方法报道了曲马多选择电极。氧氟沙星电极的特响应范围为1.0×10^-2-2.2×10^-5mol/L,斜率为30mV/PC,检测限为1.6×10^-5mol/L。 相似文献
11.
用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%. 相似文献
12.
Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction
Laurent Gavara Thomas Boisse Jean-Pierre Hénichart Adam Daïch Philippe Gautret 《Tetrahedron》2010,66(38):7544-5571
In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments. 相似文献
13.
The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula. 相似文献
14.
Rebecca J. Burton Mandy L. CrowtherNeal J. Fazakerley Shaun M. FilleryBarry M. Hayter Jason G. KettleCaroline A. McMillan Paula PerkinsPeter Robins Peter M. SmithEmma J. Williams Gail L. Wrigley 《Tetrahedron letters》2013
The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines. 相似文献
15.
KMnO4-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields. 相似文献
16.
N. A. Nedolya 《Chemistry of Heterocyclic Compounds》2008,44(10):1165-1219
The review contains a concise historical account and information on the most significant researches undertaken by the staff
at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry
of Heterocyclic Compounds.
Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008. 相似文献
17.
Regiospecific and direct imidation of the methyl C(sp3)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products. 相似文献
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《Tetrahedron》2014,70(21):3377-3384
The Rh(II)-catalyzed reaction of 2-carbonyl-substituted 2H-azirines with ethyl 2-cyano-2-diazoacetate or 2-diazo-3,3,3-trifluoropropionate provides an easy access to 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones. These compounds can be selectively prepared from the same starting material using temperature as the only varied parameter. The 2-azabuta-1,3-diene intermediate, a common precursor for both heterocyclic products, isomerizes into 2H-1,3-oxazine under kinetic control, while 1H-pyrrol-3(2H)-one is the sole product of the reaction at elevated temperatures. According to DFT-calculations a one-atom oxazine ring contraction involving ring-opening to a 2-azabuta-1,3-diene intermediate, followed by a 1,5- and 1,2-prototropic shift leads to the consecutive formation of imidoylketene and azomethine ylide, which then further undergo cyclization to the pyrrole derivative. 相似文献
20.
Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields. 相似文献