DNA capillary electrophoresis using poly(vinyl alcohol). I. Inner capillary coating

Area of Science:

• Analytical Chemistry
• Separation Science
• Materials Science

Background:

• Capillary electrophoresis (CE) is a powerful separation technique.
• Improving resolution and controlling electroosmotic flow (EOF) are crucial for DNA analysis in CE.
• Poly(vinyl alcohol) (PVAL) is explored as a capillary coating material.

Purpose of the Study:

• To develop and evaluate novel inner capillary coatings using poly(vinyl alcohol) (PVAL).
• To assess the effectiveness of these coatings in DNA capillary electrophoresis (CE).
• To investigate the impact of coatings on electroosmotic flow (EOF) mobility.

Main Methods:

• Two PVAL coating methods were developed: silanol-modified PVAL (PVAL-Si) and a PVAL coating with stable -Si-C- bonds via Grignard reaction and polymerization.
• DNA capillary electrophoresis (CE) was performed using PVAL-coated capillaries.
• Electroosmotic flow (EOF) mobility was measured.
• Atomic force microscopy (AFM) was used to study PVAL adsorption onto silica.

Main Results:

• PVAL-Si coating improved DNA CE resolution and reduced EOF by combining PVAL adsorption and silanol group reaction.
• The -Si-C- bonded PVAL coating also enhanced DNA CE resolution and decreased EOF.
• AFM confirmed PVAL adsorption onto silica surfaces.

Conclusions:

• Both novel PVAL coating methods effectively enhance DNA CE performance.
• The PVAL-Si coating leverages adsorption and chemical reaction for improved separation.
• The -Si-C- bonded coating provides a stable and effective alternative for DNA CE applications.