An inorganic magnetic fluorescent nanoprobe with favorable biocompatibility for dual-modality bioimaging and drug delivery

Hongen Guo, Yixia Zhang, Wenting Liang, Feifei Tai, Qingchen Dong, Ruiping Zhang, Baofeng Yu, Wai Yeung Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

11 Citations (Scopus)


In this work, we present the development of a high water soluble biological nanoprobe through the covalent bonding of β-CD onto the surface of iron oxide‑gold nanoclusters (Fe 3 O 4 @Au@β-CD). Fe 3 O 4 @Au@SiO 2 NPs were also prepared for comparison. The maximum emission peak of magnetic fluorescent NPs red-shifted by 30 nm and the lifetime was also elongated to 5.21 μs after surface modified with β-CD. The relaxivities and in vitro magnetic resonance imaging ability of the resultant magnetic fluorescent NPs were also studied, indicating that Fe 3 O 4 @Au@β-CD NPs have the lowest r 2 /r 1 ratio and could be a potential T 2 contrast agent for MR imaging. The MTT assay proved that, Fe 3 O 4 @Au@β-CD NPs are of excellent water solubility and biocompatibility. In vitro confocal fluorescence imaging was also performed, manifesting that Fe 3 O 4 @Au@β-CD NPs can be selectively uptaken by gastric cancer cells (MGC-803) and exhibit red fluorescence in the cells. The preliminary drug loading and releasing measurements demonstrate that it can also act as targeted drug delivery nanosystem. All these experimental results indicate that, Fe 3 O 4 @Au@β-CD NPs hold great application perspective in the diagnosis and therapy of gastric cancer cells as biological nanoprobes.

Original languageEnglish
Pages (from-to)72-81
Number of pages10
JournalJournal of Inorganic Biochemistry
Publication statusPublished - 1 Mar 2019
Externally publishedYes


  • Biocompatibility
  • Drug delivery
  • Dual-modality imaging
  • Magnetic fluorescent nanocomposites
  • Multifunctional

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry

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