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. 2020 Aug 14;21(16):5832. doi: 10.3390/ijms21165832

Figure 1.

Figure 1

1H NMR spectrum (500 MHz, D2O) of PEI-βCD (A) and PEI-βCD-αCD (B). Inverse-gated 13C H NMR spectrum (125 MHz, D2O) of PEI-βCD (C). The ratio of PEI’s amino groups (NH2:NH:N) is 1.00:1.48:1.22, which stands for 6% of functionalization of primary amino groups of PEI with βCD. Inverse-gated 13C H NMR spectrum (125 MHz, D2O) of PEI-βCD-αCD (D). The ratio of PEI’s amino groups (NH2:NH:N) is 1.00:2.48:2.12, which stands for 10% of functionalization of primary amino groups of PEI-βCD with αCD.