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用粒径约0.5微米季胺化单分散交联聚苯乙烯胶乳与粒径为5~30微米磺化交联聚苯乙烯共聚物微球藉库伦力附聚得到了阴离子交换树脂微球,并对磺化深度,基球和胶乳的粒径比以及交联度等对阴离子交换树脂附聚微球色谱性能的影响进行了分析。用这种阴离子交换树脂附聚微球作为HPIC分离柱的填料;用自制的全多孔强阳离子交换树脂YSG-SO_3H为抑制柱填料,仅用10厘米长的分离柱在约27分钟内即可使F~-、Cl~-、No_2~-、HPO_4~-、Br~-、No_3~-、及SO_4~-等阴离子混合样按顺序全分离。 相似文献
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采用配位体交换树脂对中性氨基酸(Gly,Ala,Val和Leu)进行了分离,并与一般阳离子交换树脂的分离性能进行了比较,对淋洗剂、柱温等分离条件进行了实验;研究了树脂载体结构、功能基及配位中心离子对分离性能的影响。 相似文献
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流动注射离子选择电极法自动测定阳离子交换树脂交换容量的研究 总被引:3,自引:0,他引:3
基于流动注射离子选择电极法(FIA-ISE)测定痕量Na 原理,建立了一种能自动测定阳离子交换树脂各种交换性能的方法,对影响阳阳离子交换树脂交换容量的各种因素进行考察,筛选出凝胶型强阳离子交换树脂(SACR)交换性能测定的最佳条件:微型交换柱内径3.0mm、长80mm;树脂填充量0.1951g;再生剂HCl浓度为3.0%,其流速为0.90mL/min(7.64m/h),再生剂耗量350mL/g(干树脂);样品为20mg/LNa 溶液,其流速为1.50mL/min;实现了一次测定同时获得SACR的工作交换容量、平衡交换容量、全交换容量、交换速率和树脂利用率。与ASTM法进行对照实验,其结果相关性良好(r=0.9922)。 相似文献
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用离子交换树脂脱除氨基酸与盐混合液中的盐 总被引:10,自引:0,他引:10
在用蛋白质酸性水解备氨基酸时,因中和残留的酸会使水解液中带入大量的盐。在进一步用离子交换色谱法分离混合氨基酸时,首先需脱掉其中的盐。本文用苯乙烯系强酸性阳离子交换树脂的盐型柱,根据氨基酸与苯乙烯系强酸性阳离子交换树脂之间既存在离子间的静电作用,又存在疏水作用,且二者之间存在协同作用,而盐在盐型苯乙烯系强酸性阳离子交换树脂柱上不保留的原理,用水作为洗脱剂,使盐和氨基酸(配制的盐和氨基酸混合液及含盐的毛发水解液)得到分离,本方法脱除氨基酸中的盐简单易行,用水作为洗脱剂即廉价由不造成污染,盐型树脂不用再生即可用于下次运行,研究了各种条件对分离性能的影响。 相似文献
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聚丙烯酰胺型配体交换色谱载体的合成及分离氨基酸 总被引:1,自引:0,他引:1
合成了以亲水性聚丙烯酰胺为骨架的含有可与铜离子形成五元环螯合物配位基团的螯合树脂,这些树脂的Cu~(2+)络合物作为配体交换色谱载体对中性氨基酸进行了分离,并与2种已知螯合树脂的Cu~(2+)络合物作为载体的色谱行为作了比较。本文合成的树脂具有最好的分高性能,研究了色谱条件对分离的影响,讨论了色谱分离机制。 相似文献
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P. S. Khokhlov G. D. Sokolova V. N. Osipov N. F. Savenkov 《Russian Chemical Bulletin》1998,47(9):1768-1770
Exchange reactions of tetrathiophosphates with thiophosphoryl chloride were studied. The exchange of thiol groups between
compounds with tetracoordinated phosphorus centers proceeds at 150–220°C and results in the formation of dialkyl trithiochlorophosphates
and alkyl(aryl) dithiodichlorophosphates or their mixtures depending on the ratio of the reagents.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1815–1817, September, 1998. 相似文献
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Square planar mixed ligand complexes of the type [CuLL′] where L = 5-chlorosalicylaldehyde and L′ = acetoacetanilide, have
been synthesized on treatment with ammonia. Amine exchange of the above Schiff base complexes has been carried out on treatment
with different amines. The reaction with ethanol amine is quite interesting compared to other amines. It reacts with 5-chlorosalicylaldehyde
to form a Schiff base, while the β-diketone part is removed in the complex formation. All the complexes were characterized
by elemental analysis, spectral studies, magnetic measurement, TLC, and conductane. 相似文献
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Ester exchange reaction of oxyphosphorane (1) with thymidine (2) afforded diastereomeric spirooxyphosphoranes 3 under mild conditions in good yield. After hydrolysis, thymidine phosphates monomers (5, 6) and dimer (7) were obtained. 相似文献
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The parallel tempering simulation method was recently extended to allow for possible exchanges between non‐adjacent replicas. We introduce a multiple‐exchange variant which naturally incorporates the information from all replicas when calculating statistical averages, building on the related virtual‐move method of Coluzza and Frenkel (ChemPhysChem 2005 , 6, 1779). The method is extensively tested on three model systems, namely, a Lennard‐Jones cluster exhibiting a finite size phase transition, the Lennard‐Jones fluid, and the 2D ferromagnetic Ising model. In all cases, the present method performs significantly better and converges faster than conventional parallel tempering Monte Carlo simulations. The standard deviations are also systematically decreased with respect to virtual moves. 相似文献
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D.C. Clary 《Chemical physics》1982,71(1):117-125
Calculations on the D + HBr → DBr + H and D + HI → DI + H reactions are reported. A three-dimensional, quantum-dynamical approximation is used which involves applying the energy sudden approximation to the entrance channel hamiltonian and the centrifugal sudden approximation to the exit channel hamiltonian. Results of integral and differential cross sections, rate coefficients and rotational distributions are presented. Diatomics-in-molecules potential-energy surfaces have been used in the computations. The HBrH potential has been optimesed so that the calculated room-temperature rate coefficient agrees with experiment. This potential has a barrier height of 0.237 eV. Rate coefficient computations for the four reactions H′ + H″ Cl → - H′Cl + H″ (H′, H″ = H or D) are also reported. These results, for a LEPS surface, agree well with those obtained in quasiclassical trajectory and variational transition state theory calculations. 相似文献
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As a result of transformation of isotope-exchange rate equations (isotope-kinetic equations), a relationship was derived that does not contain time and universally relates the variables of isotope composition (an isotope-mechanistic equation). With the use of this relationship, mechanistic parameters that characterize atomic rearrangements can be determined from experimental data even in cases when the rate of exchange varied in the course of a process, for example, under nonisothermal conditions. The use of the proposed approach for the treatment of the results of dynamic thermal isotope exchange in the O2–YBa2Cu3O
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and O2–Pt/CeZrO systems demonstrated that the experimental data were excellently described by the theoretical equation derived in this work 相似文献