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Microwave-Assisted Synthesis of Quasi-Pyramidal CuInS <sub/>2</sub> -ZnS Nanocrystals for Enhanced Near-Infrared Targeted Fluorescent Imaging of Subcutaneous Melanoma

DOI:10.1002/adbi.201800127 期刊:Advanced Biosystems 出版年份:2019 更新时间:2025-11-21 11:08:12
摘要: Near-infrared (NIR) fluorescent CuInS2–ZnS nanocrystals (CIZS NCs) are synthesized via an ultra-fast, non-injection microwave (MW)-assisted nanoalloying process at 230 oC within 5 min using 1-dodecanethiol (DDT) as both the sulfur source and solvent under solvothermal (ST) condition. The structural and surface analyses reveal that DDT-functionalized CIZS NCs exhibit quasi-pyramids of tetragonal-phase with well-defined facets. The DDT-functionalized CIZS NCs present a photoluminescence quantum yield (PLQY) of 76% and a long-lived fluorescence lifetime of ≈0.6 μs in organic-phase. Subsequently, DDT-functionalized CIZS NCs are phase-transferred via ligand-exchange using 11-mercaptoundecanoic acid (MUA) into water-soluble MUA–CIZS NCs that exhibit a substantial PLQY of 55%. In addition, the NIR-fluorescent MUA-functionalized CIZS NCs in conjugation with folic acid (FA), as a tumor-targeting ligand, demonstrates enhanced tumor-targeted imaging ability. The FA–MUA–CIZS NC conjugates exhibit a cell viability of ≈75% even at the highest concentration of 1 mg mL–1 and a labeling efficiency of 95.4%. The in vivo imaging results corroborate that FA–MUA–CIZS NCs conjugates are actively targeted to folate receptor-positive B16F10 tumor-bearing C57BL/6 mice in 2 h. The histopathological and hematological studies confirm no significant changes in tissue architecture and blood biochemical parameters. The confocal microscopy studies reveal deep penetration and uniform distribution of FA–MUA–CIZS NCs conjugates in subcutaneous melanoma.
作者: S. Shashank Chetty,S. Praneetha,A. Vadivel Murugan,Kavitha Govarthanan,Rama S. Verma
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To develop an ultra-fast microwave-assisted synthesis method for non-toxic, highly fluorescent CuInS2–ZnS nanocrystals and demonstrate their enhanced near-infrared targeted fluorescent imaging capabilities for subcutaneous melanoma.

The ultra-fast MW-ST synthesis produces highly NIR fluorescent CIZS NCs with excellent optical properties and biocompatibility. FA conjugation enables effective tumor-targeted imaging with high specificity and minimal toxicity, making them promising nano-bioprobes for biomedical applications.

The study is limited to specific cell lines (Pa1 and B16F10) and mouse models; potential scalability and long-term toxicity effects are not fully explored; the method may require optimization for other types of cancers or imaging applications.

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