中药川白芷化学成分的研究

中药川白芷为伞形科当归属杭白芷 (Ａｎｇｅｌｉｃａｄａｈｕｒｉｃａ (Ｆｉｓｃｈ .ｅｘＨｏｆｆｍ .)Ｂｅｎｔｈ .ｅｔＨｏｏｋ .ｃｖｈａｎｇ ｂａｉｚｈｉＨｏｒｔ)的干燥根。川白芷为我国传统中药 ,主治头疼、鼻炎、癣症等疾病。现代药理实验表明白芷中所含的呋南香豆素具有平喘、降压、抗菌、解痉、光敏、活化交感系激素等多种药理作用[1] 。已有文献对白芷的化学成分进行了研究 ,发现白芷中主要含香豆素成分[2～ 4] 。四川遂宁产川白芷为道地白芷 ,其药性好 ,为进一步研究其活性成分 ,本文对遂宁产川白芷进行化学成分研究。共分离、…     

A New Sesquiterpene Lactone from Ainsliaea bonatii

A new sesquiterpene lactone, Ainsliaolide A, was isolated from Ainsliaea bonatii. The structure was determined on the basis of spectral data.     

Study on antimony oxide self-assembled inside HZSM-5

Sb/ZSM-5 was obtained by solid-state reaction with the mixture of Sb₂O₃ and zeolite HZSM-5 under a dry nitrogen flow at 773 K. Characterization of the treated zeolite was undertaken with XRD, ²⁷Al MAS NMR, BET, TGA and FT-IR. The results revealed that part of the antimony oxides migrated into the channels of zeolite, and decreased the Brönsted acid sites in Sb/ZSM-5 remarkably. The other part of antimony oxides together with the amorphous alumino-silicate in the products distributed on the external surface of zeolite ZSM-5 and modified it, while the framework of ZSM-5 in crystal phase was retained. The structure of occluded antimony oxide inside the channels of ZSM-5 was studied by XRD Rietveld method. The result showed that their structure can be described as a chain of non-perfect [Sb₅O₅(H₂O)₂]_n⁵ⁿ⁺, which is parallel to the straight channel of ZSM-5. There is about 0.6 [Sb₅O₅(H₂O)₂]⁵⁺ unit in every cell of the ZSM-5 on an average.     

复合蛋白锌在儿科疾患方面的应用

儿童缺锌是较普遍的社会现象，济南泉城微量元素生命研究所研制的复合蛋白锌系采用生物技术转化而得到的一种蛋白复合物，属生物合成的有机微量元素，经急性和长期毒性试验均未发现毒副作用，经检测不含兴奋剂，用于临床后，对纠正偏食厌食，反复呼吸道感染和智力低下等近千例儿童疾患，显示了可喜的临床效果，证明是优质有机补锌剂。     

Crystal Structure and Characterization of a Large Polyoxotungstate (NH4)21{La(H2O)5[Ni(H2O)]2As4W40O140}·53H2O

The heteropolytungstate (NH4)₂₁{La(H₂O)₅[Ni(H₂O)]₂As₄W₄₀O₁₄₀}·53H₂O is obtained by the reaction of Na₂₇[NaAs₄W₄₀O₁₄₀]· 60H₂O with NiCl₂·6H₂O, La(NO₃)₃·6H₂O and NH₄Cl at pH‐4.5. The structure and chemical composition are determined by X‐ray diffraction analysis and elemental analysis. The crystal data and main structure refinement are a = 1.9551(3) nm, b = 2.4156(4) nm, c= 3.7068(6) nm, β = 91.505(3)°, V = 17.500 (5) nm³, monoclinic crystal system with space group P2₁/n, Z = 4, R₁ = 0.0573, wR₂ = 0.0717 [I >2<s?(I)], R₁, = 0.2463 and wR₂ = 0.1199 (all data). [La(H₂O)₅] {Ni(H₂O)}₂AS₄W₄₀O₁₄₀ has C₂, symmetry. IR spectra of the ligand [NaAs₄W₄₀O₁₄₀]^27‐ and its three complexes were discussed.     

N-(取代苯氨基硫代甲酰基)邻苯二甲酰胺酸的合成

本文用四种硫脲衍生物和一种脲衍生物同邻苯二甲酸杆进行单酰化反应, 筛选了最适宜反应条件, 避免了环状副产物, 合成了N-(取代萃氨基硫代甲酰基)邻苯二甲酸。     

A ONE-STEP SURFACE MODIFICATION PROCEDURE TO PEG-GRAFTED NANO-TITANIA

PEG （Polyethylene Glycol）-grafted nano-titania has been obtained in a one-step procedure using hexamethylene diisocyanate as the coupling agent and dibutyltin dilaurate as the catalyst in toluene at 80℃ and characterized qualitatively by FTIR and quantitatively by elemental analysis and thermogravimetric analysis. A comparison of nano-titania with two other commonly used inorganic nanoparticles, nano-silica and nano-alumina, is made, revealing that reactivity order is nano- silica 〉 nano-alumina 〉 nano-titania in view of PEG grafting. Possible mechanism of PEG grafting is also discussed.     

热谱重建法及其在热动力学研究中的应用

在热动力学研究中,大多数实验是在热导式热量计中进行的。由于量热系统的热惯性,记录得到的热谱会出现“失真”,为了正确方便地分析被研究过程的动力学性质,必须对所得热谱进行改造或重建。本文系统地提出了一种新的重建法,即热谱重建法。实验结果表明,该法可广泛应用于热动力学研究。     

纤维声速仪的简化

测定纤维中分子键取向度的声速仪见前文。作者等鉴于仪器将会得到更广泛的应用,特将声速仪中的直流电源、脉冲讯号发生器及多谐振蕩器与放大器等三件仪器簡化;針对它們的基本原理設計一台声波触发器取而代之。