Pb2+ binding by polyaspartyl polymers and their application to Pb2+ removal from glycyrrhizin

Polyaspartate is an excellent Pb²⁺‐binding agent in comparison with some polyaspartamide derivatives with different side chains, in that it possesses a higher Pb²⁺ uptake and a lower Pb²⁺ equilibrium concentration. Equilibrium sorption data for Pb²⁺ on polyaspartate can be well fitted with the Freundlich and Langmuir models. Experimental results show that a crosslinked polyaspartate hydrogel is superior to poly(acrylic acid)‐based resins and polystyrene‐based chelating resins. IR spectra and X‐ray photoelectron spectra reveal that the polyaspartate hydrogel binds Pb²⁺ by both an ion‐exchange mechanism and a chelating mechanism. The polyaspartate hydrogel is also an effective agent for the removal of Pb²⁺ from glycyrrhizin. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 2215–2220, 2005     

一步法合成5-甲基海因

以氰化钠、碳酸铵、乙醛等为原料，常压下一步反应得到５甲基海因，总收率７０２％。其最佳操作条件为：反应温度７５℃，反应时间３ｈ，原料碳酸铵与氰化钠之比为２∶１，酸化回流ｐＨ值为２，酸化回流时间２ｈ。     

多种油脂的脂肪酸组成分析

制备出一种柱效高、成本低的复合型色谱柱。并利用醇解法进行了脂肪酸甲酯化，用气相色谱法测定了乌桕脂、棕榈油、可可脂、鱼油及自制类可可脂的脂肪酸组成。     

Evaluation of wastewater reclamation processes in a high-tech industrial park

The objectives of this research were to evaluate two different processes using for wastewater reclamation in a hightech industrial park area in Taiwan. The major units of the first AC-RO-IE system included sand filter, an activated carbon (AC) bed, microfiltration module, a reverse osmosis (RO) membrane and ionic-exchange (IE) columns. The second DAF-AC-RO system was comprised of coagulation/flocculation, dissolved air flotation (DAF), an activated carbon bed, microfiltration module and reverse osmosis membrane units. This study was carried out at a pilot-scale plant in situ that operated for approximately 1 year. According to the long-term experimental results, both the AC-RO-IE and the DAF-AC-RO processes illustrated excellent performances on inorganic and organic contaminant removal. Comparing the removal efficiency of the filtration-AC units in the AC-RO-IE system with the coagulation-DAF-AC units in the DAF-AC-RO system, the removal efficiency of TDS, SiO₂ and COD increased by 19.8%, 70.1% and 44.4% in the latter system, respectively. In addition, the combination of PAC-coagulation and DAF units could improve hardness removal, modify the form of dissolved silica, and reduce the SDI and MFI values. It showed good potential as a pretreatment unit in wastewater reclamation processes. Therefore, based on the reclaimed wastewater quality and process operational stability, the DAF-AC-RO system was suggested as a potential process for further application.     

锂离子电池正极材料LixMn2O4研究进展

总结了锂离子电池正极材料LixMn2O4的合成方法，归纳了造成容量衰减问题的原因和目前为解决该问题所采用的各种方法，并且对下一步的研究工作进行了展望。     

固定化紫草细胞生产紫草宁衍生物

用海藻胶包埋紫草细胞,在紫草色素生产培养基M_9中,常温、黑暗下培养不同时间,收集培养液并提取色素,进行紫外—可见全波长分光光度扫描和TLC分析。结果表明:固定化紫草细胞可连续分泌紫草色素,其主要成分与天然成分基本相同,产量已达到一定水平。此外对海藻胶包埋条件、固定化珠粒的稳定性以及1L固定化植物细胞反应器生产紫草色素工艺进行了讨论。     

利用棒杆菌由N－乙酰氨基肉桂酸制备L－苯丙氨酸

从土壤中分离到一株棒杆菌（ＣｏｒｙｎｅｂａｃｔｅｔｉｕｍＳｐ．），可利用Ｎ－乙酰氨基肉桂酸作底物，通过酰基转移和氨基转移两步酶促反应，生成Ｌ－苯丙氨酸。利用０．２ｍｏｌ／Ｌ的乙酰氨基肉桂酸可生成０．０６ｍｏｌ／Ｌ的Ｌ－苯丙氨酸，摩尔转化率可达３０％。     

苯乙酸合成新工艺

应用氯化钴和低价含硫化合物低压合成四羰基钴盐的技术于氯苄羰化合成苯乙酸的生产工艺中。结果表明甲醇水溶剂系统有利于低压合成四羰基钴盐；氢氧化钙作中和剂使用，要求羰化产物后处理的温度提高，以保证苯乙酸的产率；碱的用量和浓度是影响苯乙酸产率的重要因素。     

含硫化合物在羰基钴盐合成中的应用

研究了利用低价含硫化合物的强配位能力和还原性及它作为助剂催化引发氯化钴的羰化反应的工艺条件，以便在较低的ＣＯ压力下合成四羰基钴盐。对几种常见含硫化合物的引发反应效果进行了对比。结果表明少量的含硫化合物可以引发钴盐的羰化反应，过多的添加则会阻断氯苄羰化反应的催化作用。     

酶法合成中色氨酸的测定

建立了光度测定酶法合成中色氨酸含量的新体系。该检测体系不仅能准确地测定产物色氨酸的含量，且对底物吲哚能同时测定。有效地避免了其他色氨酸测定方法底物吲哚的干扰，通过标准加入法色氨酸及吲哚的回收率分别为９７．８％～１０３．３％，９７．６％～１０３％。实验证明该体系简单、实用，测定结果可靠。