大孔吸附树脂提取穿心莲总内酯的研究

研究了大孔吸附树脂提取和纯化穿心莲总内酯的方法，采用HPLC法测定了穿心莲内酯的含量；考查了乙醇浓度对浸提效果的影响，并经动态吸附筛选了4种树脂；最后确定以ADS－7作为提取分离穿心莲总内酯的树脂，此树脂吸附量较高，脱附容量且能与杂质分离，有利于得到质量较好的穿心莲总内酯产品。     

ADSORPTION OF TANNIN FROM AQUEOUS SOLUTION ONTO MACROPOROUS CROSSLINKED POLY(N-VINYL-ACETAMIDE) VIA HYDROGEN BONDING

I INTRODUCTIONTannin is existed widely in the roots, stems and fruits of many plants 111. Tannin is stronglyastringent and puckery due to the hydrogen bonding between the phenolic hydroxyl groups intarmin and abide groups in Protein al. A series of PYOb\m won\d be abed if t~ is nOIremoved from the products made from plants. For example, the injection site of the patientwould be red and swollen if tannin had not been removed from the injection made from plantssuch as red-rooted sajvia; …     

SYNTHESIS AND STRUCTURE OF MACROPOROUS MA-TMPTA COPOLYMERS AND THEIR APPLICATION IN ADSORPTION OF FLAVONOIDS FROM GINKGO LEAVES EXTRACT

1 INTRODUCTIONAdsorption by macroporous polymeric adsorbents is one of tile important methods inpurification of ginkgo leaves extract ill. Amberlite XAD-7, a macroporous polymeric adsorbentbased on methyl methacrylate - trimethylolpropane triacrylate copolymer, was reported to use inadsorptive purification of ginkgo leaves extract and other natural products containing flavonoidsfi.3]. Interaction between the adsorbent and flavonoids is based on hydrogen bonding between theester carbonyl-…     

酚醛型吸附树脂在非水体系中对吡啶和N,N-二甲基苯胺的吸附性能研究

研究了酚醛型吸附树脂JDW 2在非水体系中对吡啶和N ,N 二甲基苯胺的静态吸附 .由实验结果推论正己烷中树脂对吡啶和N ,N 二甲基苯胺的吸附是以氢键吸附机理为主进行的 ,JDW 2酚醛型吸附树脂在正己烷中 ,等温吸附吡啶和N ,N 二甲基苯胺的平衡吸附数据符合Langmuir方程 ,相关系数在 0 99以上 ,因此 ,酚醛型吸附树脂在正己烷中吸附吡啶和N ,N 二甲基苯胺属单分子层吸附 ;同时对非水体系中乙醇或乙酸乙酯的含量对树脂吸附吡啶和N ,N 二甲基苯胺的影响进行了研究     

THE APPLICATION OF A NOVEL ADSORBENT IN RAPID SAMPLE CLEAN-UP OF GINKGOLIDES AND BILOBALIDE IN EXTRACTS OF GINKGO BILOBA LEAVES

1 INTRODUCTIONGinkgolides, known as specific antagonist of platelet factor (PAF), possess uniquepharmaceutical properties and are main active constituent of many phytopharrnaceuticpreparations based on ginkgo bilioba leaves extracts II]. Another active terpenoid, namelybilobalide, is reported recently to show potent therapeutic efficacy to the disease related to nervesystem 121. They are all terpene lactones, which are highly oxidized as illustrated in Figure 1.The first attempts to ana…     

氯甲基聚苯乙烯与芳烃的后交联反应研究

氯甲基聚苯乙烯与苯或芳烃发生Ｆｒｉｅｄｅｌ－Ｃｒａｆｔｓ反应，制得了一系列具有高比表面积的吸附树脂，结果表明，后交联反应时，所加芳烃及溶剂对树脂的比表面积有很大的影响，这类树脂对水溶液中苯酚具有较大的吸附量。     

选择性吸附树脂ADS-22制备高含量大豆异黄酮

筛选6种不同性能的吸附树脂,对比了这些树脂对大豆异黄酮的吸附规律.结果表明,以大豆胚为原料,用乙醇提取,经选择性吸附树脂ADS-22的吸附,再用75%的乙醇洗脱,可得到含量达74.37%大豆异黄酮提取物,表明ADS-22树脂对大豆异黄酮有良好的吸附选择性.     

氯甲基化聚苯乙烯后交联过程中的氧化反应研究

在１２０℃将氯甲基化聚苯乙烯进行Ｆｒｉｅｄｅｌ—Ｃｒａｆｔｓ后交联制备超高交联聚苯乙烯的过程中，伴随有氧气对氯甲基化聚苯乙烯的氧化作用而使超高交联聚苯乙烯含有极性基团羰基约２．５ｍｍｏｌ／ｇ，而在较低的温度下，通过后交联制备超高交联聚苯乙烯时，则没有氧化反应发生。     

INFLUENCE OF FUNCTIONAL GROUP REACTIONS ON THE PORE STRUCTURE OF MACROPOROUS CROSSLINKED POLYSTYRENE RESINS

The change of the pore structure of styrene-divinylbenzene copolymer caused by the presenceof the functional group has been discribed in this paper. The result indicates that the average poreredius, pore volume and surface area were reduced after the introduction of the functional groups.However, the surfase area of the resin containing--NH_2 or --NHCH_3 group and treated with waterand isopropyl alcohol was inareased prominently in comparison with that of the matrix copolymer. When the strongly polar ion exchange resin absorbs water, its pore diameter increases sharply.But the pore diameter of the weakly polar ion exchange resin does not change very much when itabsorbs water gradually.     

催化剂制备工艺对PEMFC氧电极性能的影响

聚合物电解质膜燃料电池（PEMFC）具有高能量密度、运行温度较低、水热管理较为容易、稳定性较好等优点，可以应用在航天领域、潜艇、电动车、电站等领域，是目前燃料电池领域中令人关注的研究课题．在提高电池性能所作的各种尝试中，膜电极制备工艺的改进依旧是研究的重点［'1