高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (10): 2061.doi: 10.7503/cjcu20150391

• 高分子化学 • 上一篇    下一篇

动脉粥样硬化造影剂PGMA-EDA-g-PEG-g-DS@IO的合成及性能

胡齐1, 方超1, 赵外鸥2, 李亚鹏1(), 陈霞2, 王静媛1   

  1. 1. 吉林大学化学学院, 麦克德尔米德实验室, 长春 130012
    2. 吉林大学第一医院, 长春 130021
  • 收稿日期:2015-05-15 出版日期:2015-10-10 发布日期:2015-08-26
  • 作者简介:联系人简介: 李亚鹏, 男, 博士, 副教授, 主要从事医用高分子材料研究. E-mail:maishilou134@163.com
  • 基金资助:
    国家自然科学基金(批准号: 20904014)资助

Synthetic of PGMA-EDA-g-PEG-g-DS@IO as a Magnetic Resonance Contrast Agent for Atherosclerosis

HU Qi1, FANG Chao1, ZHAO Wai’ou2, LI Yapeng1,*(), CHEN Xia2, WANG Jingyuan1   

  1. 1. College of Chemistry, Alan G. MacDiarmid Institute, Jilin University, Changchun 130012, China
    2. The First Hospital of Jilin University, Changchun 130021, China
  • Received:2015-05-15 Online:2015-10-10 Published:2015-08-26
  • Contact: LI Yapeng E-mail:maishilou134@163.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.20904014)

摘要:

利用乙二胺(EDA)对聚甲基丙烯酸缩水甘油酯(PGMA)进行开环反应, 制备了侧链多氨基聚合物PGMA-EDA; 再利用聚乙二醇(PEG-COOH)和硫酸葡聚糖钠盐(DS)分别对PGMA-EDA上氨基进行酰胺化反应和还原胺化反应, 制备含动脉粥样硬化斑块靶向分子DS的双亲性接枝共聚物PGMA-EDA-g-PEG-g-DS. 通过核磁共振(1H NMR)谱和红外光谱(FTIR)表征了聚合物的结构. 利用凝胶渗透色谱(GPC)表征了聚合物的数均分子量Mn=16255, 多分散性指数PDI=1.54. 采用配体交换法, 利用该聚合物对油胺配体超顺磁性氧化铁纳米粒子进行修饰, 制备了水溶性氧化铁纳米粒子PGMA-EDA-g-PEG-g-DS@IO. 通过透射电镜(TEM)和动态光散射(DLS)表征了纳米粒子的形貌和粒度, 采用热重分析(TGA)和振动样品磁强(VSM)仪表征了纳米粒子的包覆率和磁强度. 采用细胞计数试剂盒(CCK)测定了纳米粒子的细胞毒性, 结果表明, 水溶性纳米粒子的生物相容性较好, 可作为动脉粥样硬化斑块的特异性磁共振检测用造影剂.

关键词: 动脉粥样硬化造影剂, 磁共振成像, 氧化铁纳米粒子, 硫酸葡聚糖钠盐, 乙二胺, 聚乙二醇, 聚甲基丙烯酸缩水甘油酯

Abstract:

To design a new magnetic resonance(MR) imaging contrast agent of atherosclerosis, poly(glycidyl methacrylate)-graft-ethane diamine(PGMA-g-EDA) was prepared by the ring-opening reaction of PGMA which was synthesized by atom transfer radical polymerization(ATRP). Poly-ethylene glycol(PEG) and dextran sulfate(DS) were graft modified to PGMA-g-EDA continuously via amidation reaction and reductive amination to synthesis PGMA-EDA-g-PEG-g-DS. The structure and properties of PGMA-EDA-g-PEG-g-DS were characterized through nuclear magnetic resonance(1H NMR). Fourier transform infrared spectroscopy(FTIR) and gel permeation chromatography(GPC). The superparamagnetic iron oxide nanoparticles(IONPs) were coated with PGMA-EDA-g-PEG-g-DS by ligand exchange to prepare water-soluble IO. The transmission electron microscopy(TEM) analysis indicated that micelles were well dispersed in water and had uniform sizes. The result of thermogravimetric analysis(TGA) indicated that about 70%(mass fraction) polymers coated on the surface of IO. The cell counting kit(CCK) assay showed no significant toxicity to RAW264.7. The above results confirm that PGMA-EDA-g-PEG-g-DS@IO can be used as a potential contrast agent for atherosclerosis MR imaging.

Key words: Contrast agent of atherosclerosis, Magnetic resonance imaging, Iron oxide nanoparticles, Dextran sulfate, Ethane diamine, Polyethylene glycol, Poly(glycidyl methacrylate)

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