Qu Rongjun, Sun Changmei, Ji Chunnuan, Wang Chunhua, Chen Hou, Niu Yuzhong, Liang Chengju, Song Qiyi
School of Chemistry and Materials Science, Ludong University, Yantai, Shangdong, PR China.
Carbohydr Res. 2008 Feb 4;343(2):267-73. doi: 10.1016/j.carres.2007.10.032. Epub 2007 Nov 5.
A series of insoluble chitosan (CTS) derivatives were prepared by grafting ester- and amino-terminated dendrimer-like polyamidoamine (PAMAM) into CTS using a divergent method by repeating two processes: (1) Michael addition of methyl acrylate (MA) to surface amino groups, and (2) amidation of the resulting esters with ethylenediamine (EDA). Their structures were characterized by infrared spectra (IR) and wide-angle X-ray diffraction (WAXD). The adsorption capabilities of the products for Au(3+), Pd(2+), Pt(4+), Ag(+), Cu(2+), Zn(2+), Hg(2+), Ni(2+), and Cd(2+) were studied. The results showed that the products exhibited better adsorption capabilities for Au(3+) and Hg(2+) than for other metal ions, and the adsorption capabilities of amino-terminated products were higher than those of ester-terminated ones. Also it was observed that a high percentage of grafting of PAMAM into CTS does not ensure a high adsorption capacity.
通过重复两个过程的发散法，将酯基和氨基封端的树枝状聚酰胺-胺（PAMAM）接枝到壳聚糖（CTS）中，制备了一系列不溶性壳聚糖衍生物：（1）丙烯酸甲酯（MA）与表面氨基进行迈克尔加成反应；（2）所得酯与乙二胺（EDA）进行酰胺化反应。通过红外光谱（IR）和广角X射线衍射（WAXD）对其结构进行了表征。研究了产物对Au(3+)、Pd(2+)、Pt(4+)、Ag(+)、Cu(2+)、Zn(2+)、Hg(2+)）、Ni(2+)和Cd(2+)的吸附能力。结果表明，产物对Au(3+)和Hg(2+)的吸附能力优于其他金属离子，且氨基封端产物的吸附能力高于酯基封端产物。此外，还观察到PAMAM接枝到CTS中的高接枝率并不能保证高吸附容量。
