Page 259 - IJB-10-1

International Journal of Bioprinting 3D-printed hydrogel with antioxidant activity

Figure 5. FTIR spectra of the borax-treated CMFs/guar gum construct. Abbreviations: CGB, Borax-treated CMFs/guar gum construct; CMF, cellulose
microfibril.

height selected were 50%, 100 mm/s, 0.8 mm, and 0.5 mm, h (about 40% errors), the stability after treatment with
respectively. borax, which was measured by the dimensional error of
the construct, had increased by 2.6 folds after 12 h. The
3.6. Stability, structural, and textural properties of complex with boric acid/borate ions and the hydroxyl
printed constructs groups on the many side chains of CMFs and guar gum
The shape of 3D-printed bioproducts may transform through non-covalent linkages may facilitate the linkage,
within a short time (minutes to hours) after printing thereby improving post-printing stability of the printed
owing to their highly dynamic nature. This leads to constructs using CMFs/guar gum. 13,18
relatively poor mechanical properties of the printed
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products and short-term stability. In the present study, The FTIR spectra of the borax-treated construct
−1
the printed constructs using CMFs/guar gum also showed are presented in Figure 5. At 3320 cm , the stretching
lower post-printing stability (Table S3 in Supplementary vibrations of the –O–H bonds in guar gum were observed
File). Thus, the printed constructs were treated using to be highly hydrogen-bonded, while the vibrations of
−1 48
borax, to maintain shape fidelity, since previous study –C–H bonds appeared at 2922 cm . The observed
−1
reported that crosslinking with borax has improved C=O stretching at 1647 cm indicates the presence of a
47
flocculation efficiency of guar gum noticeably. In carbonyl group of non-substituted amide and water of
addition, biomaterial ink is claimed to be biocompatible guar gum. The deformation modes involving the OH,
or non-cytotoxic, and borax is known to be non-toxic. CH, and C–N groups are associated with the 1372 cm
−1
13
Although the overall shape of the printed constructs band. The hydroxylic C–O single bond stretching of the
using CMFs/guar gum significantly deformed over 12 C–O–C group in the anhydroglucose ring dominates the
Volume 10 Issue 1 (2024) 251 https://doi.org/10.36922/ijb.0164