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Related Concept Videos

A Single-Component System01:24

A Single-Component System

In the field of chemistry, the terms "component" and "phase" hold significant importance. A component refers to a chemically distinct substance in a system that has specific properties. It is chemically homogeneous, meaning it has the same properties throughout. For example, in a mixture of salt and water, both salt and water are considered separate components because they have different chemical properties.On the other hand, a phase is a form of matter that has a consistent chemical...
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Updated: Jun 24, 2026

Bioprinting of Cartilage and Skin Tissue Analogs Utilizing a Novel Passive Mixing Unit Technique for Bioink Precellularization
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A Mixing System for Uniform, Reproducible Viscous Bioinks Preparation.

Ryan Singer1,2, David A González-Martínez3, Aidee Verónica Arizpe Tafoya2,3

  • 1Firestone Institute for Respiratory Health─Division of Respirology, Department of Medicine, McMaster University, Hamilton, Ontario L8N 4A6, Canada.

ACS Biomaterials Science & Engineering
|November 14, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel static mixer system for preparing cell-laden bioinks used in extrusion 3D bioprinting. The optimized SMX-style mixer ensures high cell viability and uniform distribution for consistent tissue engineering.

Keywords:
biomaterial inkextrusion 3D bioprintinggelatin methacrylatepoly(ethylene glycol) diacrylatestatic mixer

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Additive Manufacturing

Background:

  • Extrusion 3D bioprinting relies on bioinks, which are challenging to prepare due to high viscosity.
  • Manual mixing of cells into viscous biomaterials can be inconsistent and detrimental to cell viability.
  • Static mixers offer a potential solution for reproducible bioink preparation, but their efficacy for viscous applications needs thorough investigation.

Purpose of the Study:

  • To evaluate and compare the performance of four different static mixers for preparing cell-laden bioinks.
  • To assess mixing uniformity, shear stress, and cell viability across various static mixer designs.
  • To demonstrate the utility of the optimized mixing system in extrusion 3D bioprinting for tissue construct fabrication.

Main Methods:

  • Three novel static mixers (SMX-style, Ross ISG, serpentine) were 3D printed and compared with a commercial CELLINK mixer.
  • Biomaterial inks (PEGDA, methacrylated gelatin) were characterized using rheology.
  • Fluid dynamics simulations estimated shear stress, while fluorescent beads assessed mixing effectiveness.
  • Cell viability assays were performed on A549, NIH-3T3, and primary human lung fibroblasts post-mixing.

Main Results:

  • The SMX-style mixer demonstrated superior mixing uniformity and the lowest simulated shear stress compared to other designs.
  • Cell viability remained above 96% for all tested cell types when using the SMX-style mixer.
  • The SMX-style mixer achieved a more homogeneous cell distribution than the commercial comparator.
  • Successful extrusion 3D bioprinting of viable tissue constructs with evenly distributed cells was achieved.

Conclusions:

  • A simple, reproducible, and flexible static mixing system was developed for incorporating cells into viscous bioinks.
  • This system enhances consistency in cell distribution and viability during bioink preparation.
  • The optimized static mixer facilitates standardized fabrication of cell-laden constructs for extrusion 3D bioprinting applications.