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Synthesis and Characterization of Lysine Modified Chitosan Magnetic Microspheres: A Novel Gene Delivery System

[+] Author Affiliations
Shuangyan Li, Lijuan Hao, Yong Yang, Lei Han, Peng Yao, Jie Huang, Jin Chang

Tianjin University, Tianjin, China

Paper No. MNC2007-21141, pp. 357-366; 10 pages
  • 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems
  • First International Conference on Integration and Commercialization of Micro and Nanosystems, Parts A and B
  • Sanya, Hainan, China, January 10–13, 2007
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4265-7 | eISBN: 0-7918-3794-7
  • Copyright © 2007 by ASME


This paper describes a new formulation of magnetic nanoparticles coated by a novel polymer lysine modified chitosan (CS-lys) as gene carrier. Lysine modified chitosan was synthesized by performing carboxyl of lysine and amido of chitosan in the presence of 1-Ethyl-3-(3-dimethyllaminopropyl) carbodiimide hydrochloride (EDC). The absolute chemistry of the Lysine modified chitosan obtained were characterized using IR and 1 H NMR, respectively. The results indicated that many amines of chitosan were modificatied with lysine, and optimized the correlation conditions. The lysine modified chitosan magnetic microspheres were preprated by co-precipitation method. The characterizations of microspheres were measured by TEM, XPS, Dynamic Laser Light Scattering, Vibrating Samples Magnetometer, and X-ray diffraction. The resultes indicated the average particle size was about 100nm and have good superparamagnetic property. The cytotoxicity of CS-lys MNPs was investigated with U293 cells. The results showed that the CS-lys MNPs retained of low toxicity; additionally, combination of DNA and CS-lys MNPs was observed from agarose gel electrophoresis, suggesting that the CS-lys MNPs could be a novel magnetic targeting gene carrier. We also studied the ability of complexes of CS-lys MNPs and DNA crossing BBB in rats by single photon emission computed tomography (SPECT).

Copyright © 2007 by ASME



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