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International Journal of Bioprinting Chitin/gelatin/PVA scaffolds

Figure 1. Physicochemical characterization of chitin powder extracted from fruit fly pupae. (A) FTIR spectra, (B) DSC thermogram, (C) DTG curves,
(D) XRD patterns, and (E) C NMR spectrum.
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from 30°C to 35°C for 3DP inks. For ES samples, zero shear extrusion through the nozzle (high shear values) .
[51]
viscosity value was very low, suggesting that the material However, in addition to rheological properties, other
will not present difficulties to be extruded and thus will factors must be considered in order to select the most
not require purge-type printing strategies. Additionally, appropriate temperature for 3D printing. In this work,
m parameter was also the lowest at 35°C, indicating that since chitin sedimentation on the tip can cause nozzle
the samples at this temperature are the least viscous at clogging, a lower temperature was required to ensure a
high shear values. This effect is favorable for 3D printing, homogenous chitin dispersion in the extruded 3DP ink.
because low viscosities are required to facilitate material As a consequence, temperature values selected to process

Volume 9 Issue 3 (2023) 178 https://doi.org/10.18063/ijb.701