荧光试剂二(苯并三唑-1-基)乙二酮缩氨基脲的合成及其在蛋白质测定中的应用

荧光光度法;荧光试剂二(苯并三唑-1-基)乙二酮缩氨基脲的合成及其在蛋白质测定中的应用     

铁(Ⅲ)-柠檬酸盐配合物光解引发橙黄Ⅱ的脱色

光降解;铁(Ⅲ)-柠檬酸盐配合物光解引发橙黄Ⅱ的脱色     

Facile three‐component one‐pot synthesis of indeno‐[1,2‐b]quinolin‐9,11(6H,10H)‐dione derivatives

One‐pot three‐component cyclocondensation of aldehydes, 1,3‐indanedione and enaminones proceeds in the presence of acetic acid to afford Indeno[1,2‐b]quinolin‐9,11(6H,10H)‐dione derivatives, The method has the advantage of excellent yields(85‐94%) and simple workup procedure.     

高效液相色谱法同时测定甜瓜样品中的抑霉唑和噻菌灵

提出了一种用高效液相色谱法 (HPLC)同时测定甜瓜样品中的抑霉唑和噻菌灵残留量的方法。用乙酸乙酯作提取剂提取甜瓜样品 ,通过一个净化步骤分离样品中共提取组分。采用InertsilC8 3色谱柱 (15 0mm× 4 .6mm ,5 μmi.d ,) ,流动相为乙腈∶水 =75∶2 5 ,外标法定量 ,方法的检出限噻菌灵为 0 .70ng ,抑霉唑为1.5 3ng ;回收率为 87.5 %～ 98.0 % ;相对标准偏差为 1.5 %～ 4 .2 %。本法用于甜瓜样品中抑霉唑、噻菌灵含量的测定 ,获得了满意的结果。     

反应条件对Ni-CaO-ZrO2催化剂上CH4-CO2重整反应及积炭的影响

用共沉淀法制备了Ni-CaO-ZrO₂催化剂,并将其用于CH₄-CO₂重整反应。考察了反应温度、空速和反应物配比对催化剂性能和积炭的影响。通过热力学计算和实验表征研究发现,反应条件对CH₄-CO₂重整反应结果和积炭有重要的影响。由于高温条件同时有利于CH₄裂解和碳物种的及时消除,升高温度可以提高催化剂的活性和稳定性。增大空速则使CH₄的转化率和消碳反应的速率均降低,导致积炭量增加。同时,反应物配比对催化剂表面的积炭量也有很大影响;稍高的CO₂/CH₄摩尔比有利于抑制CH₄-CO₂重整反应过程中的积炭。     

Microwave‐Assisted Modular Fabrication of Nanoscale Luminescent Metal‐Organic Framework for Molecular Sensing

Miniaturizing the size of metal‐organic framework (MOF) crystals to the nanometer scale is challenging, but it provides more advanced applications without changing the characteristic features itself. It is especially useful to investigate the correlation between the porous properties and the interfacial structures of nanocrystals. Using amino acids as capping agents, nanoscale Tb‐MOF‐76 is fabricated rapidly by means of microwave‐assisted methods. Both the modular effects of the amimo acids and the acid–base environment of the reaction medium have an important impact on the morphologies and dimensions of Tb‐MOF‐76. The structures of the samples are confirmed by powder X‐ray diffraction, and the morphologies are characterized by SEM. Photoluminescence studies reveal that these Tb‐MOF‐76 materials exhibit a green emission corresponding to the transition ⁵D₄→⁷F_J of Tb³⁺ ions under UV‐light excitation, which is sensitive to small organic molecules in solution.     

有机官能团对硅基MSU-X织构性能的影响

采用有机硅氧烷(RTES)与硅氧烷(TEOS)共水解缩聚合成了有机官能化的MSU-1中孔材料(R=甲基,苯基,乙烯基,脲丙基)。当前驱体中RTES与TO64EOS的摩尔比为0.1:0.9时合成R10-MSU-1分子筛,通过现化分析技术证明BA所选有机官能团均能进入分子筛骨架,而且在相同摩尔数的各数有机硅氧烷存在下,由于其反应速率、空间位阻的不同使其对骨架的缩聚程度、孔道和表面性质有不同的影响。利用SAXS实验技术对所合成R10-MSU-1材料结构表面以及由于有机官能团的存在对无机骨架产生的影响进行了研究。SAXS较强的散射强度分布对Porod定理形成负偏离,表明孔和基体之间有明显的界而层存在,并求得界面层的平均厚度。实验证明有机基团的均匀分布于孔道表面而形成有机界面层。SAXS测试还显示上述分子筛呈质量分形特征,其形成过程可能为非平衡非线性的聚集机制。     

壳聚糖及其衍生物与金属配位的研究进展

本文综述了壳聚糖、壳聚糖衍生物及其降解产物与金属配位的性能,形成某些配位化合物的条件、组成、结构及其表征,阐述了它们的应用。     

Concise Synthesis of(±)-epi-Chrysotricine

Chrysotricine 1 was isolated from the Chinese herb medicine Hedyotis Chrysotricha and was shown to possess antitumor activity1. Its structure has been elucidated as a novel zwitterionic (-carboline alkaloid containing a 2,2,5-trisubstituted tetrahydrofuranyl group. The (-carboline compounds have attracted considerable attraction in recent years because of their promising and intriguing biological activities2. Recently, we have established the absolute configuration of chrysotricine by the fir…     

Photocatalytic Characterization of TiO_2 Supported on Active Carbon

Photocatalysis on TiO2, with a promising application to the elimination of organic contaminants from air and water, has been a particularly active area1. For such application, it is important to improve the efficiency of TiO_2 photocatalysts. In the most cases, the concentration of organic contaminants in water is extremely dilute (ppm level or below) and TiO_2 itself has low adsorbabilities for them, it usually takes a long time to complete their decomposition. One of the effective ways to …