Extended Spherical Diffusion Theory: Electrochemiluminescence Imaging Analysis of Diffusive Molecules from Spherical...

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Biosensing

Background:

• Spherical biosamples like cells and beads are crucial in bioapplications.
• High-throughput analysis of individual biosample bioactivity is essential for sensitive assays.
• Electrochemiluminescence (ECL) imaging offers a method for analyzing diffusive molecules from spherical biosamples.

Purpose of the Study:

• To develop a theoretical framework for analyzing spherical biosamples on flat surfaces using ECL imaging.
• To introduce a novel "extended spherical diffusion theory" for this purpose.
• To provide guidelines for ECL imaging analysis of spherical biosamples.

Main Methods:

• Development of the extended spherical diffusion theory based on common spherical diffusion theory.
• Validation of the theory through simulated analysis.
• Application of the theory to visualize glucose oxidase activity in hydrogel beads using ECL imaging.
• Calculation of enzymatic product flux using the developed theory.
• Time-dependent simulations to reconcile theoretical and experimental data.

Main Results:

• The extended spherical diffusion theory successfully describes the concentration profile of diffusive molecules from spherical biosamples on a flat electrode.
• The theory enables accurate estimation of molecular flux and calculation of bioactivity.
• ECL imaging combined with the new theory visualizes enzymatic activity in hydrogel beads.
• A method is established for calculating enzymatic product flux.

Conclusions:

• The novel extended spherical diffusion theory provides a robust theoretical foundation for ECL imaging of spherical biosamples on flat surfaces.
• This approach facilitates high-throughput, individual analysis of biosample bioactivity.
• The study offers practical guidelines for researchers utilizing ECL imaging in bioanalytical applications.