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. 2019 Dec 2;14:9453–9467. doi: 10.2147/IJN.S224579

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© 2019 Zhao et al.

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Synthesis and characterization of PEI-SA complexes. (A) Scheme of EDC-mediated coupling reaction between PEI and SA. (B) ¹H NMR spectra of SA, PEI and PEI-SA. (C) Change of fluorescence intensity ratio (I₃₇₄/I₄₁₇) for pyrene in distilled water in the presence of PEI-SA with 15.5% substitute degrees of amino group. (D) The size distribution of PEI-SA.