Binding of several heavy metal ions by polyaspartyl polymers and their application to some Chinese herbal medicines
✍ Scribed by Bo Sun; Zhen-Tao Mi; Gang An; Guozhu Liu
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 302 KB
- Volume
- 106
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Abstract
Water‐insoluble polyaspartyl polymers were synthesized by using water as medium instead of organic medium. Taking Ca^2+^ as a reference, the binding of several heavy‐metal ions, including Pb^2+^, Cd^2+^, Hg^2+^, Cr^3+^, Cu^2+^, and Mn^2+^, by polyaspartyl polymers was studied. The experimental results revealed that polyaspartate is an excellent binding agent for the investigated heavy‐metal ions. These cation ions were bound to polyaspartate polymer by the same mechanism as Pb^2+^, which can be explained by ion exchange model. Since polyaspartate has a protein‐resembling structure that is sensitive to trace heavy metal, it was used to remove some trace heavy‐metal elements in Chinese herbal medicines. It was found that polyaspartate material was an effective agent for the removal of Pb^2+^, Cd^2+^, and Hg^2+^ ions from glycyrrhizin, angelica, and gynostemma pentaphyllum. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007