应用化学 ›› 2022, Vol. 39 ›› Issue (4): 685-693.DOI: 10.19894/j.issn.1000-0518.210580

• 研究论文 • 上一篇    下一篇

Nd3+离子敏化的荧光纳米探针用于近红外二区血管成像

张松涛1,2, 王樱蕙1(), 张洪杰1,2()   

  1. 1.中国科学院长春应用化学研究所,稀土资源与利用国家重点实验室,长春 130022
    2.中国科学院大学,北京 100049) 3. (清华大学化学系,北京 100084
  • 收稿日期:2021-12-28 接受日期:2022-03-08 出版日期:2022-04-01 发布日期:2022-04-19
  • 通讯作者: 王樱蕙,张洪杰
  • 作者简介:E-mail:hongjie@ciac.ac.cn
    E-mail: yhwang@ciac.ac.cn
  • 基金资助:
    国家自然科学基金(52022094);中国科学院青年创新促进会(2019232)

Nd3+ Sensitized Fluorescent Nanoprobes for Vascular Imaging in the Second Near Infrared Window

Song-Tao ZHANG1,2, Ying-Hui WANG1(), Hong-Jie ZHANG1,2()   

  1. 1.State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
    3.Department of Chemistry,Tsinghua University,Beijing 100084,China
  • Received:2021-12-28 Accepted:2022-03-08 Published:2022-04-01 Online:2022-04-19
  • Contact: Ying-Hui WANG,Hong-Jie ZHANG
  • Supported by:
    National Natural Science Foundation of China(52022094);the Youth Innovation Promotion Association of Chinese Academy of Sciences(2019232)

摘要:

近年来,相较于可见光(400~700 nm)和近红外一区光(700~1000 nm),生物组织对近红外二区光(NIR-Ⅱ: 1000~1700 nm)呈现更弱的吸收、散射以及更低的自体荧光,因此,近红外二区荧光成像具有更深的组织穿透能力、更高的成像信噪比和更高的空间分辨率等优势,在血管造影和淋巴管造影等方面具有重要的应用前景。本文利用高温共沉淀和外延生长法成功地制备了NaGdF4∶Yb(18%,摩尔分数),Ho(2%),Ce(30%)@NaGdF4,Nd(60%)@NaGdF4,Nd(10%)核-壳-壳纳米材料(U/DNPs)。在808 nm激发光的照射下,不仅具有1056和1332 nm的下转换近红外二区荧光发射,而且具有较高红绿荧光强度比(I647/I540 = 22.6)的上转换红光发射,使得该材料在光动力学治疗中具有巨大的应用潜力。随后通过利用配体交换策略,成功修饰了聚乙烯吡咯烷酮(U/DNPs-PVP),使其具有良好的水溶性及生物安全性。在小鼠活体内荧光成像中,U/DNPs-PVP呈现优异的血管造影效果,其空间分辨率可达336.3 μm。

关键词: 稀土离子, 近红外二区, 荧光成像, 血管成像

Abstract:

In recent years, in comparison to the light in the visible range (400~700 nm) and first near-infrared window (NIR-Ⅰ, 700~1000 nm), the light in the second near-infrared window (NIR-Ⅱ, 1000~1700 nm) possess the merits of the lowest optical scattering and absorption in the bio-tissue. So NIR-Ⅱ fluorescence imaging with deeper tissue penetration depths, high spatiotemporal resolution and signal to noise ratio (SNR) plays an important role in the fields of angiography, lymphangiography and so on. Herein, Nd3+ sensitized fluorescent nanoprobe (U/DNPs, NaGdF4∶Yb(18% mole fraction),Ho(2%),Ce(30%)@NaGdF4,Nd(60%)@NaGdF4,Nd(10%)) with core-shell-shell is synthesized through high-temperature coprecipitation and epitaxial growth method. Under the irradiation of 808 nm, the NIR-Ⅱ fluorescence at 1056 nm and 1332 nm are obtained via down-conversion process for further vascular imaging. Furthermore, it can emit red upconversion fluorescence with high red to green (R/G) ratio (I647/I540= 22.6), possessing greatly potential application for photodynamic therapy. After successful modification of polyvinyl pyrrolidone (PVP) via ligand-exchange strategy, the U/DNPs-PVP nanomaterials possess excellent solubility in water and good biocompatibility, and can achieve the NIR-Ⅱ fluorescence vessels imaging with spatial resolution of 336.3 μm in vivo.

Key words: Rare earth ions, Second near-infrared window, Vascular imaging, Fluorescence imaging

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