Acta Chimica Sinica ›› 2010, Vol. 68 ›› Issue (01): 95-101. Previous Articles    

Special Topic

左旋甲基多巴分子印迹纳米给药系统的合成、表征及药物缓释研究

凌霞2,李红萍2,郭娟2,汤又文1,赖家平*,1   

  1. (1华南师范大学化学与环境学院 广州 510006)
    (2四川师范大学化学与材料科学学院 成都 610066)
  • 投稿日期:2009-01-24 修回日期:2009-07-09 发布日期:2010-01-20
  • 通讯作者: 赖家平 E-mail:laijp@scnu.edu.cn

Synthesis and Characterization of Molecularly Imprinted Polymeric Microspheres for L-Methyldopa and Its Application to Drug Delivery System

Ling Xia2 Li Hongping2 Guo Juan2 Tang Youwen1 Lai Jiaping*,1   

  1. (1 School of Chemistry and Environment, South China Normal University, Guangzhou 510006)
    (2 College of Chemistry & Materials, Sichuan Normal University, Chengdu 610066)
  • Received:2009-01-24 Revised:2009-07-09 Published:2010-01-20
  • Contact: LAI Jia-Ping E-mail:laijp@scnu.edu.cn

The molecularly imprinted polymeric microspheres (MIPMs) for L-methyldopa (LMD) were synthesized by precipitation polymerization. The influences of synthetic conditions such as polymerization temperature, the amount of initiator (AIBN) and the property of template on the morphologies and diameter sizes of MIPMs were investigated in details. The results indicated that the morphologies of MIPMs were evidently affected by the polymerization temperature and the amount of AIBN. The diameters of MIPMs were decreased with increasing the polymerization temperature but increased with increasing the amount of AIBN, while the influences of template on the diameters of microspheres are not visible. The resultant MIPMs was characterized by scanning electronic microscopy (SEM), IR analysis, BET adsorption test and Scatchard analysis as well as the controlled release test in mimetic gastric juice (pH=1). The IR analyses proved that the polymerization effects really occurred. The BET adsorption test indicated that the adsorption amount of MIPMs to LMD was as three times as that of non-imprinted microspheres (NIPMs). The controlled release test indicated that the release ratio of LMD on NIPMs was linearly increased with increasing time, which suggests that the release process is completely controlled by diffusion. Meanwhile, the release ratio of LMD on MIPMs was curvedly increased with increasing time, which indicates that the release process is controlled by both diffusion and the imprinting effect. And the release time was prolonged. The results indicate that the MIPMs released the LMD for 10 h while the NIPMs for only 5 h in the mimetic gastric juice. Therefore, the resultant MIPMs of LMD looks forward to being used as the materials for DDS.

Key words: molecularly imprinted polymeric microsphere, precipitation polymerization, L-methyldopa, controlled release, drug delivery system