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International Journal of Bioprinting Antheraea pernyi silk fibroin bioinks for DLP 3D printing

Figure 2. (A) The FTIR spectrum of ASF-MA. (B) Curve fitting analysis of ASF-MA. (C) The secondary structural fraction of ASF-MA (ns: p > 0.05,
*p < 0.05, **p < 0.01, ***p < 0.001). (D) Compressive stress–strain curve of hydrogels immersed in PBS. (E) Compressive stress–strain curve of hydrogels
immersed in 75% ethanol. (F) Tensile stress–strain curve of hydrogels soaked in 75% ethanol.

with lower methacryloylation including 30% ASF-MA which were 0.0193 and 0.0290 Mpa higher than the 20%
5%
PBS hydrogel. In Figure 2E, the compressive strength of and 30% ASF-MA 10% PBS hydrogels, respectively. Both
the hydrogels was almost enhanced after being soaked in low-methacryloylation ASF-MA EtOH and ASF-MA 2.5%
5%
75% ethanol for 4 h. The hydrogels with the same degree EtOH hydrogels exhibited remarkable stiffness changes. At
of methacryloylation showed a gradual improvement 20% deformation, 30% ASF-MA 2.5% EtOH had the highest
in compressive strength with increasing concentration. compressive modulus of 0.561 Mpa. It was 70 times more
Compared with ASF-MA 10% PBS hydrogel, ASF-MA 10% than the compressive modulus of the 30% ASF-MA 2.5%
EtOH hydrogel had a smaller increment in compressive PBS with 0.00800 Mpa. For the compressive modulus of
strength. The 10% ASF-MA 10% EtOH hydrogel was the 30% ASF-MA EtOH hydrogel, it was about 0.404 Mpa
5%
lowest at only 6 kPa (35% deformation). For the equivalent which was 14 times more than the compressive modulus
deformation, the 20% and 30% ASF-MA 10% EtOH of the 30% ASF-MA PBS with 0.0290 Mpa. Overall,
5%
hydrogels were approximately 0.0950 and 0.298 Mpa, the compressive properties were generally enhanced

Volume 9 Issue 5 (2023) 246 https://doi.org/10.18063/ijb.760