应用化学 ›› 2025, Vol. 42 ›› Issue (3): 386-395.DOI: 10.19894/j.issn.1000-0518.240425

• 研究论文 • 上一篇    下一篇

功能型聚乙二醇化壳聚糖纳米颗粒的制备和表征

肖巨颖1,2, 赵霞1, 林园1(), 苏朝晖1,2()   

  1. 1.中国科学院长春应用化学研究所,高分子物理与化学国家重点实验室,长春 130022
    2.中国科学技术大学应用化学与工程学院,合肥 230026
  • 收稿日期:2024-12-24 接受日期:2025-01-21 出版日期:2025-03-01 发布日期:2025-04-11
  • 通讯作者: 林园,苏朝晖
  • 基金资助:
    国家自然科学基金(22175170)

Preparation and Investigation of Functional PEGylated Chitosan Nanoparticles

Ju-Ying XIAO1,2, Xia ZHAO1, Yuan LIN1(), Zhao-Hui SU1,2()   

  1. 1.State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    2.School of Applied Chemistry and Engineering University of Science and Technology of China,Hefei 230026,China
  • Received:2024-12-24 Accepted:2025-01-21 Published:2025-03-01 Online:2025-04-11
  • Contact: Yuan LIN,Zhao-Hui SU
  • About author:linyuan@ciac.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(22175170)

摘要:

通过酰胺化反应,将不同相对分子质量(500、1000)的双端功能化聚乙二醇(N3-PEG-COOH)引入壳聚糖(CS)分子骨架,利用三聚磷酸纳(Sodium tripolyphosphate, TPP)离子凝胶法制备了一系列具有可控粒径和表面电势的壳聚糖-聚乙二醇(CS-PEG)纳米颗粒。 结合傅里叶红外变换光谱(FT-IR)、核磁共振氢谱(1H NMR)和热重分析(TGA)表征方法证明了PEG的成功引入; 利用透射电子显微电镜(TEM)和纳米粒度电位仪表征了纳米颗粒的结构。 实验结果表明,当m(CS)∶m(TPP)=3.33∶1时,CS纳米颗粒具有优良的结构稳定性,在此基础上随着PEG接枝密度的增加,会进一步降低CS-PEG纳米颗粒的粒径和表面电势。 此外,以炔基修饰的荧光分子5-羧基荧光素-炔烃(5-FAM-alkyne)为模型,验证了功能化CS-PEG纳米颗粒末端叠氮的化学反应活性,为其进一步作为药物载体、荧光探针或其他生物活性分子的功能平台提供了可能。

关键词: 壳聚糖, 纳米颗粒, 点击化学, 离子凝胶法, 聚合物荧光探针

Abstract:

In the present study, Carboxyl and azide terminated polyethylene (N3-PEG-COOH) with different relative molecular mass of 500 and 1000 were grafted onto the chitosan (CS) backbones through amide reaction, followed by the preparation of chitosan-polyethylene glycol (CS-PEG) nanoparticles with controllable size and zeta potential via sodium tripolyphosphate (TPP) ionotropic gelation. Characterized by Fourier transform infrared spectrometer (FT-IR), nuclear magnetic resonance spectroscopy (NMR) and thermal gravimetric analyzer (TGA) confirmed the successful incorporation of PEG, and the structures of the nanoparticles were analyzed by transmission electron microscopy (TEM) and nanoparticle size and zeta potential analyzer. The results demonstrated that when m(CS)∶m(TPP) is 3.33∶1, CS nanoparticles show excellent structural stability. Based on this, increasing the PEG grafting density further reduces the particle size and surface potential of CS-PEG nanoparticles. Moreover, the chemical reactivity of azide in CS-PEG nanoparticles was proved by the click reaction with alkyne-modified fluorescent molelule (5-FAM-alkyne), showing their potential as paltform for target drug delivery, fluorescent probes and other biomedical applications.

Key words: Chitosan, Nanoparticles, Click reaction, Ionotropic gelation, Polymer fluorescent probes

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