Macromolecular inks of nanocellulose-alginate for direct-ink-writing: Functional scaffolds enriched with curcumin extracts

What if the key to healing wounds and fighting bacteria lies in a humble spice, transformed by cutting-edge 3D printing? This study turns turmeric's curcumin into a printable, bioactive scaffold.

Turmeric is more than a kitchen staple—it's a powerhouse of bioactive compounds. Researchers extracted curcuminoids and phenols from turmeric using a green, solvent-free method with supercritical CO2, yielding up to 6.57 mg/100 g curcuminoids and 232.45 mg/100 g total phenols. These extracts showed strong antioxidant activity (DPPH IC50: 23.24 mg/mL; ABTS IC50: 3.59 mg/mL) and broad-spectrum antimicrobial effects against pathogens like Staphylococcus aureus and E. coli, with a minimum inhibitory concentration of 9.38 mg/mL.

The team then mixed these extracts into inks made of nanofibrillated cellulose and alginate, creating a shear-thinning gel perfect for direct-ink-writing 3D printing. After printing, they crosslinked the structures with CaCl2, which reinforced the hydrogel network, boosting mechanical strength and shape fidelity. The resulting scaffolds boasted a highly porous, grid-like architecture with intricate surface details.

This work demonstrates a scalable platform that combines green extraction, additive manufacturing, and natural polymers—paving the way for biomedical applications like tissue engineering and wound dressings. The future of regenerative medicine might just be printed layer by layer, with a dash of turmeric.

Key Points

• Green CO2 extraction yields curcuminoids and phenols from turmeric.
• Inks show shear-thinning behavior for 3D printing.
• CaCl2 crosslinking boosts mechanical strength and shape fidelity.