Cryodesiccation-driven crystallization preparation approach for zinc(II)-phthalocyanine nanodots in cancer photodynamic therapy and photoacoustic imaging
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Multifunctional nanodots represent an emerging platform for overcoming the delivery challenges of poorly water-soluble drugs for use in the diagnosis and treatment of cancer. The authors describe the preparation of nanocrystallites composed of the water-insoluble photosensitizer zinc(II)-phthalocyanine in the form of nanodots by applying a cryodesiccation-driven crystallization approach. Modification of the surface of the nanodots with Pluronic F127 and folic acid endows them with excellent water solubility and stealth properties in blood. Under near-infrared (NIR) photoexcitation at 808 nm, the nanodots are shown to produce singlet oxygen, which is widely used in photodynamic therapy of cancer. The nanodots exhibit strong NIR absorbance at 808 nm and can be used as a non-toxic contrast agent for photoacoustic imaging of tissue.
KeywordsPluronic F127 Folic acid Near-infrared photoexcitation Contrast agent Singlet oxygen
H.D. and Y.C. contributed equally to this work. This work was supported by China Postdoctoral Science Foundation (2018 M633229), Sanming Project of Medicine in Shenzhen (SZSM201612031), Natural Science Foundation of Guangdong Province of China (2018A030310665, 2018A0303130295), Shenzhen Science and Technology Innovation Committee (ZDSYS201707281114196, JCYJ20170306091657539, JCYJ20170413162242627, JCYJ20170306091452714, GJHZ20170313172439851), Development and Reform Commission of Shenzhen Municipality (S2016005470013).
Compliance with ethical standards
The author(s) declare that they have no competing interests.
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