摘要：
An ultrasonically assisted extraction (UAE) technique was developed for the extraction of manganese from electrolytic manganese slag using a sulfuric acid-hydrochloric acid mixture (4:0.3, v/v) as solvent. The UAE conditions were optimized and the significance of variables affecting UAE tested. The determination of manganese was carried out by atomic absorption spectrophotometry (AAS). The ultrasonic extraction efficiency of manganese can reach about 90% under the following optimum conditions: solvent-slag ratio: 4 mL/g; temperature: 333 K; particle size: 0.2 mm; extraction time: 35 min; amount of additive (citric acid): 8 mg/g slag. During the UAE process, the particle size parameter on the extraction was the most significant, followed by solvent-slag ratio, citric acid mass, time and temperature. The repeatability of UAE technique was satisfactory. The ultrasonic method shown to be a much superior approach to the conventional extraction method in the extraction of manganese from slag. (C) 2007 Elsevier B.V. All rights reserved.
摘要：
Based on hydrophobic and electrostatic interactions, a norfloxacin (NOF) imprinted polymer (PI) was prepared by the combined use of bismethacryloyl-beta-cyclodextrin (BMA-beta-CD) and 2-(diethylamino)ethylmethacrylate (DEAEM) as functional monomers. Compared with the molecularly imprinted polymers (MIPs) using only BMA-P-CD or DEAEM as a functional monomer, P-2 and P-3, respectively, P, showed higher binding affinity and specificity for NOF in aqueous media. Scatchard plot analysis revealed that two classes of binding sites were formed in the imprinted polymer with dissociation constants of 0.32 mu mol/ml and 1.19 mu mol/ml, respectively. It demonstrated that the combination of hydrophobic effect and electrostatic interaction in molecular imprinting was essential for the improvement of the selective ability of the imprinted polymer. Factors that influenced rebinding of the imprinted polymer including pH, water content in the adsorbed solution were explored. (C) 2007 Elsevier B.V. All rights reserved.
期刊：
Journal of Pharmaceutical and Biomedical Analysis,2006年41(3):701-706 ISSN：0731-7085
通讯作者：
Deng, Qinying
作者机构：
[Deng, Qinying] Sun Yat Sen Univ, Sch Chem & Chem Engn, Guangzhou 510275, Peoples R China.;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
通讯机构：
[Deng, Qinying] S;Sun Yat Sen Univ, Sch Chem & Chem Engn, Guangzhou 510275, Peoples R China.
摘要：
A series of metoclopramide (MCP)-imprinted polymers utilizing methacrylic acid or 2-vinylprindine (2-VP) as functional monomer and chloroform, acetonitrile or methanol as porogen were prepared. The affinity and specificity of these polymers were evaluated by equilibrium binding experiments. Proton NMR model studies on interactions between the template and functional monomer analogues, acetic acid and d(5)-pyridine, were performed in the same solvents that were used as porogens for the molecularly imprinted polymers (MIPs). A correlation was found to exist between the binding strength and specificity of a particular polymer and the extent of monomer-template interactions shown by the corresponding NMR spectrum. So, a useful means is provided to predict the performance of a MIP in this paper. Based on the results of NMR experiments and selectivity experiments, the role of functional groups of the template in the formation of complementary interacting sites in the polymer in different porogens was discussed, and the mechanism of molecular recognition of the MIPs was proposed. (c) 2006 Elsevier B.V. All rights reserved.
作者机构：
[Zeng, RY] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.;Guangxi Normal Univ, Dept Chem, Guilin 541004, Peoples R China.
通讯机构：
[Zeng, RY] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
作者机构：
[张复兴] Department of Chemistry, Hengyang Teachers' College, 421008 Hengyang, China;Hunan Normal University, China;Chemistry Department, Hengyang Teachers' College, China;Chinese Chemical Society, China;[邝代治] Department of Chemistry, Hengyang Teachers' College, 421008 Hengyang, China, Hunan Normal University, China, Chemistry Department, Hengyang Teachers' College, China, Chinese Chemical Society, China
通讯机构：
[Kuang, D.] D;Department of Chemistry, Hengyang Teachers' College, China
