Extraction and Purification of DNA from Complex Biological Sample Matrices Using Solid-Phase Microextraction Coupled...

Area of Science:

• Analytical Chemistry
• Biotechnology
• Materials Science

Background:

• Determining trace DNA in complex biological samples is challenging for nucleic acid analysis.
• Current methods often require multiple steps and can be inefficient for crude lysates.

Purpose of the Study:

• To develop and evaluate a polymeric ionic liquid (PIL)-based solid-phase microextraction (SPME) method for DNA extraction.
• To improve the efficiency and purity of DNA isolation from complex matrices for downstream applications like real-time PCR (qPCR).

Main Methods:

• Eight different PIL sorbent coatings were synthesized using on-fiber ultraviolet initiated polymerization.
• DNA extraction performance was assessed using qPCR, comparing PIL fibers to commercial SPME fibers.
• The mechanism of DNA extraction by PIL sorbents was investigated, considering electrostatic and ion-exchange interactions.

Main Results:

• A specific PIL sorbent coating with halide anions and carboxylic acid groups showed superior DNA extraction capabilities.
• The PIL-based SPME method demonstrated selectivity for DNA in the presence of PCR inhibitors (CaCl2, FeCl3).
• High-purity DNA was extracted from crude bacterial cell lysate with 100.3% qPCR amplification efficiency, without organic solvents or centrifugation.

Conclusions:

• PIL-based SPME is a highly effective technique for extracting and purifying DNA from complex biological samples.
• The developed method offers a simplified, solvent-free approach for high-purity DNA isolation, suitable for sensitive downstream analyses.
• This advancement addresses a key bottleneck in nucleic acid analysis, enabling more robust molecular diagnostics and research.