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. 2017 Apr 21;7:46688. doi: 10.1038/srep46688

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Copyright © 2017, The Author(s)

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(I) A–D show the UV-Vis spectra of HIDPPNPs (A and B) and freely dissolved ICG (C and D) in PBS under 4 (A and C) or 37 °C (B and D) incubation without light illumination for 0, 2, 4, 8, 24, and 48 h. The absorbance at λ = 780 nm in each spectrum denotes the level of ICG for those specific conditions. (II) Variations in the ICG amount in the polymer matrix (i.e., HIDPPNP) or PBS solution under 4 and 37 °C environments within 48 h. The values are the mean ± s.d. (n = 3).