Nanocellulose for gel electrophoresis

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Analytical Chemistry

Background:

• Cellulose nanofibres (CNFs) produced via TEMPO-mediated oxidation possess gel-forming properties.
• Conventional gel electrophoresis is a cornerstone of biomolecular separation and diagnostics.

Purpose of the Study:

• To present a proof-of-concept for utilizing nanocellulose (NC) as a substrate for gel electrophoresis.
• To investigate the feasibility of chemically cross-linked NC gels for separating molecules via electrophoresis.

Main Methods:

• TEMPO-oxidized CNF dispersions were chemically cross-linked using amide linkages to form gel slabs.
• Nanocellulose gel slabs containing Tris/Borate/EDTA (TBE) buffer were prepared and tested with electrophoresis tracking dyes.
• The effect of different cross-linker types (e.g., EDA, HMDA) and concentrations on dye migration was assessed.

Main Results:

• Tracking dyes (bromophenol blue, orange G) demonstrated differential migration and separation within the NC gels.
• Increasing cross-linker chain length (C2 to C6) enlarged the gel network's pore size, accelerating dye migration.
• Higher cross-linker concentrations stabilized the gel structure without impacting dye migration rates.
• Increased voltage proportionally enhanced the migration rates of both dyes.

Conclusions:

• Nanocellulose gels show promise as a novel substrate for electrophoretic separation.
• Further optimization is needed for uniform gel casting and to mitigate bubble formation during cross-linking.
• NC-based electrophoresis holds potential for sustainable applications in biomedical separation and diagnostics.