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A targeted rheological bioink development guideline and its systematic correlation with printing behavior
Axel Pössl1, David Hartzke1, Thomas M Schmidts1
1Institute of Bioprocess Engineering and Pharmaceutical Technology, Technische Hochschule Mittelhessen-University of Applied Sciences, Wiesenstraße 14, 35390 Giessen, Germany.
Biofabrication
|January 20, 2021
Summary
Researchers developed a reproducible hydrogel bioink for artificial extracellular matrix (ECM) in bioprinting. This bioink demonstrates optimized printing properties and stability for tissue engineering and disease modeling applications.
Area of Science:
- Bioprinting
- Tissue Engineering
- Biomaterials
Background:
- Bioprinting requires artificial extracellular matrix (ECM) to mimic native scaffolds for cell growth.
- Bioink material composition is critical for host immune response, cell compatibility, and adhesion.
- Developing functional bioinks is essential for advancing tissue and disease models.
Purpose of the Study:
- To evaluate multi-material bioink blending for artificial ECM development using a design of experiments approach.
- To characterize the printing behavior and rheological properties of a novel hydrogel bioink.
- To assess the short-term cultivation stability of the developed bioink under varying temperature conditions.
Main Methods:
- A design of experiments approach was used to blend four pre-selected bioink components.
- Rheological measurements were performed to link processing temperatures to 3D printing behavior.
- Extrusion-based bioprinting parameters (temperature, pressure, feed rate, nozzle geometry) were systematically evaluated.
- A modified O-R-O test characterized interactions between printing pressure and feed rate.
Main Results:
- A highly reproducible hydrogel bioink for artificial ECM was developed.
- The bioink exhibited essential shear-thinning behavior and high zero-shear viscosity for printing.
- Printing parameters were optimized, and nozzle interactions were characterized.
- The bioink demonstrated stability under simulated hypothermic and hyperthermic conditions.
Conclusions:
- An expandable concept for bioink development was established.
- A reproducible and well-characterized procedure for printing with the novel hydrogel was presented.
- Detailed insights into the relationships between printing parameters, rheology, and cultivation stability were provided.
