氧化淀粉变性基团的分析方法

介绍了淀粉工业中氧化淀粉变性基团羧基和羰基的测定方法     

Adsorption isotherms of sesame oil in a concentrated miscella system

The adsorption of peroxides, unsaturated carbonyls, free fatty acids and carotenoids from unrefined sesame oil on vegetable carbon (5%, w/w) in a miscella system was studied. Three different solvent conditions (hexane/ethanol, 100:0, 95:5 and 75:25, vol/vol), combined in a factorial design with five levels of solvent (0, 10, 20, 30 and 40%, w/w), were used to develop the miscella. Equilibrium adsorption was not achieved during the 100 min of adsorption, mainly because the oil components were involved in oxidation reactions during the adsorption process. However, for a given solvent concentration, adsorption of the oil components showed a significant linear regression on their respective initial concentration in the miscella (C_i). Peroxides and carbonyls showed, at all solvent levels investigated, an affinity for the carbon more independent of their C_i than free fatty acids and carotenoids. In general, at the same C_i, a higher adsorption was achieved as solvent concentration increased. The results indicated that free fatty acid adsorption may depend on competitive adsorption based on molecule hydrophobicity. However, in spite of the higher hydrophobicity of carotenoids, compared with free fatty acids, they might not be competing for the same adsorbing sites. Ethanol showed a prooxidant effect that increased peroxide production during adsorption but did not affect the reaction involved in carbonyl production.     

4-乙基-2,3-双氧哌嗪酰氯的提取及分析

用双-三氯甲基碳酸酯(三光气)代替光气和4-乙基-2,3-双氧哌嗪发生酰氯化反应制备哌嗪酰氯(EOCP),反应液用硅醚提取,得到产品4-乙基-2,3-双氧哌嗪.反应收率可达92.28%,产品纯度为82.49%.     

From Molecular Clusters to Metal Nanoparticles

Different methods to prepare supported metal nanoparticles of uniform size are discussed. (i) Supported ruthenium particles were generated from Ru and Ru-Fe bimetallic molecular metal carbonyl cluster precursors (MCC). (ii) Gold nanoparticle formation in the supercage of Y zeolite was studied on Au/NaY, Au/HY and Au-Fe/HY system. (iii) Palladium nanoparticles were grown in liquid phase then deposited on an SiO₂ support or they were grown on the support surface in a solid-liquid interfacial layer. The particle size control was more efficient in the latter two cases than in the preparation starting from MCC.     

Guanine and plasmid DNA binding of mono- and trinuclear fac-[Re(CO)3]+ complexes with amino acid ligands

We have synthesized and fully characterized four new complexes comprising the fac-[Re(CO)3]+ moiety and the ligands NH3, L-proline (Pro), or N,N-dimethylglycine (dmGly). The reaction of [Re(H2O)3(CO)3]+ with the two amino acids gives trinuclear complexes of general formula [Re(L)(CO)3]3 (where L = amino acid). We have studied the in vitro behavior of these compounds with guanine and DNA in order to understand whether the cytotoxicity exhibited by certain rhenium complexes based on the fac-[Re(CO)3]+ core is due to the formation of nucleobase complexes and inter- or intrastrand links between DNA bases. We have performed model studies with guanine and studied the structural effects induced by different rhenium(I) tricarbonyl complexes on PhiX174 plasmid DNA by electrophoretic methods. Our results show that rhenium complexes with two available coordination sites interact with plasmid DNA to form a stable adduct that is likely to involve two bases.     

羰基合成醋酐反应条件的实验研究

对羰基液相合成醋酐反应过程中受温度、压力、停留时间等反应条件的影响进行实验研究,通过对实验数据的分析,确定优化条件为:反应时间15~20 min,反应压力(10~15)×105Pa,反应温度290~300 K,催化剂浓度40~45 g/L,搅拌速率10~12 n/min,为工艺的工业化放大提供了依据。     

甲醇羰基合成醋酸作原料的钛精馏塔腐蚀行为探讨

聚乙烯醇装置醋酸乙烯生产流程中醋酸精馏塔等设备采用钛材制作,使用乙醛氧化生产醋酸,设备耐蚀情况良好;但使用羰基合成醋酸腐蚀却很严重,为此对该钛设备的腐蚀原因进行了分析。由于羰基合成是醋酸发展的方向,但一般含钼不锈钢难以使用,如能提出防护措施,发挥钛材的耐蚀潜力,则必将对今后应用醋酸作原料的化工化纤生产有很大的现实意义。     

纳米铁微粒制备新进展

纳米铁微粒是重要的纳米金属材料。本文综述了纳米铁微粒制备方法（包括物理方法和化学方法）的最新进展。     

碳酰氟的研究进展

碳酰氟是一种应用于半导体设备刻蚀和清洗的新型材料,在有机合成及氟化物的干燥、纯化领域也有重要应用。目前国内外关于碳酰氟的制备报道有很多,根据原料种类大体可分为四类,其中CO作为原料制备碳酰氟是应用最多的方法。作为应用于半导体行业的电子气体,对于纯度有一定的要求,因此碳酰氟的纯化也是制约其工业化应用的重要因素。