Page 116 - IJB-9-2

International Journal of Bioprinting Photocurable pullulan-based bioink for 3D printing

Figure 1. Synthetic route of Pul-NB and schematic of thiol-ene reaction.

Figure 2. H NMR spectra of Pul-NB with different degree of substitution (A) and unmodified pullulan (B).
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chemical shifts were found in 6.300 to 6.000 ppm. H NMR 3.1.2. FTIR
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spectra of Pul-NB and unmodified pullulan confirmed Figure 3 shows the FTIR spectra of pullulan and pullulan
that the functional norbornene groups were successfully grafted with norbornene group. The wide absorption peak
grafted onto the molecular of pullulan. at 3343 cm was attributed to the stretching vibrations of
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Volume 9 Issue 2 (2023) 108 https://doi.org/10.18063/ijb.v9i2.657