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Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo

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OPTIMIZING COLLAGEN TRANSPORT THROUGH TRACK-ETCHED NANOPORES.

Ericka M Bueno¹, Jeffrey W Ruberti

¹Department of Mechanical and Industrial Engineering, Northeastern University, 360 Huntington Avenue, 334 Snell Engineering, Boston, MA, 02115, Telephone: (617)373-7211, ,

Journal of Membrane Science

|March 12, 2011

Summary

We optimized collagen transport through nanopores for biotechnology applications. Membrane hydrophilization significantly enhanced collagen transport, achieving high concentrations and monomer flux.

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Area of Science:

Biotechnology
Materials Science
Polymer Science

Background:

Polymer transport via nanopores offers potential for molecular separation and organization.
Mimicking cell-mediated assembly, this study drives collagen monomers through nanopores for aligned fibril production.

Purpose of the Study:

To investigate type I atelo-collagen monomer transport through polycarbonate track-etched membranes.
To optimize conditions for enhanced collagen transport and fibrillogenesis.

Main Methods:

Examined collagen transport through 80-nm polycarbonate nanopores under varying concentrations (1.0-7.0 mg/ml) and pressures (0-20 inH2O).
Utilized hydrophilized membranes with covalently bound poly(ethylene-glycol) to minimize solute-membrane interactions.
Applied a modified open pore model to predict transport parameters.

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Main Results:

Collagen transport was concentration- and pressure-dependent, exhibiting complex behavior in semi-dilute solutions.
Diffusivities in semi-dilute solutions were double those in dilute solutions, suggesting cooperative diffusion or polymer entrainment.
Membrane hydrophilization significantly enhanced collagen transport, yielding the highest concentration (5.99±2.58 mg/ml) and flux (2.60±0.49 ×10^3 molecules s^-1 pore^-1) at 2.8 mg/ml collagen and 10 inH2O.

Conclusions:

Modified open pore models can reasonably predict collagen transport parameters.
Membrane hydrophilization is crucial for enhancing collagen transport efficiency.
Optimized conditions enable efficient production of aligned collagen fibrils for biotechnological applications.