Optimization and miniaturization of SE-ECL for potential-resolved, multi-color, multi-analyte detection.

Area of Science:

• Bioanalytical Chemistry
• Electrochemistry
• Luminescence

Background:

• Electrochemiluminescence (ECL) offers high resolution, signal-to-noise ratio, dynamic range, and rapid measurements.
• Multiplexed detection of multiple analytes is crucial in various bioanalytical applications.
• Traditional multi-electrode setups can be complex and cumbersome.

Purpose of the Study:

• To develop a simplified single-electrode electrochemiluminescence (SE-ECL) configuration for multiplexed multicolor detection.
• To optimize SE-ECL parameters for enhanced signal intensity.
• To demonstrate the feasibility of simultaneous multicolor emission and detection using SE-ECL.

Main Methods:

• Utilized intrinsic differences in electric potential along single electrodes for selective luminophore excitation.
• Optimized SE-ECL intensity by varying channel lengths and widths.
• Investigated the effect of different Alternating Current (AC) voltage waveforms (sine vs. square) on ECL intensity.
• Integrated SE-ECL with a CMOS semiconductor image sensor for multicolor detection.

Main Results:

• SE-ECL intensity increased 5-fold with longer channels (6 cm vs. 2 cm) and linearly with channel width.
• Square AC waveforms significantly enhanced emitted light intensity compared to sine waveforms.
• Demonstrated multiplexed multicolor SE-ECL, successfully distinguishing four different colors simultaneously.
• Achieved simultaneous detection of multiple analytes using the developed SE-ECL system.

Conclusions:

• The SE-ECL configuration effectively simplifies multiplexed multicolor detection.
• Optimization of channel dimensions and AC voltage waveforms enhances ECL signal intensity.
• SE-ECL integrated with CMOS sensors provides a powerful platform for simultaneous multi-analyte quantification.