Capillary electrophoresis apparatus equipped with a bioluminescence detector using a batch- or flow-type detection...

Area of Science:

• Analytical Chemistry
• Biochemistry
• Biotechnology

Background:

• Nucleotide analysis is crucial in various biological and chemical applications.
• Existing methods for nucleotide detection may lack sensitivity or specificity.
• Capillary electrophoresis (CE) offers high-resolution separation capabilities.

Purpose of the Study:

• To develop and evaluate a capillary electrophoresis apparatus coupled with bioluminescence (BL) detection for nucleotide analysis.
• To compare the performance of batch-type and flow-type BL detection cells.
• To assess the detection limits and separation capabilities for various nucleotides.

Main Methods:

• Development of a CE apparatus integrated with either a batch- or flow-type bioluminescence detection cell.
• Utilized the firefly luciferin-luciferase bioluminescence reaction for nucleotide detection.
• Analyzed a range of nucleotides including ATP, dATP, ADP, GTP, UTP, CTP, ITP, and TTP.

Main Results:

• The flow-type BL cell detected ATP, dATP, and ADP with detection limits of 1, 75, and 100 microM, respectively.
• The batch-type cell detected ATP at 5-100 microM but showed peculiar peak broadening.
• Separation of ATP and dATP was achieved in the flow-type cell using a pH 10 buffer with phenylboronic acid, demonstrating delayed ATP migration due to interaction.

Conclusions:

• The developed CE-BL system, particularly with the flow-type cell, provides a sensitive method for detecting and separating key nucleotides like ATP, dATP, and ADP.
• Phenylboronic acid in the running buffer can be used to modulate the migration of nucleotides like ATP through specific interactions.
• This technique holds promise for efficient nucleotide analysis in complex biological samples.