A new microvolume technique for bioaffinity assays using two-photon excitation

Area of Science:

• Biotechnology
• Analytical Chemistry
• Biomedical Engineering

Background:

• Bioaffinity binding assays, including immunoassays, are crucial in life science research for quantifying target molecules.
• Current methods rely on antibody-target molecule binding, with quantification revealing analyte concentration.

Purpose of the Study:

• To present a new method for measuring bioaffinity assays using two-photon excitation of fluorescence.
• To demonstrate the method's effectiveness and potential for broad applications in research and clinical settings.

Main Methods:

• Utilized microparticles as the solid phase for binding target molecules in bioaffinity assays.
• Employed two-photon excitation of fluorescence for quantifying the degree of binding on individual microparticles.
• Validated the method using the human alpha-fetoprotein (AFP) immunoassay for fetal disorder detection.

Main Results:

• Successfully demonstrated the effectiveness of the two-photon fluorescence method for bioaffinity assays.
• Achieved high sensitivity and a wide dynamic range in the human alpha-fetoprotein (AFP) immunoassay.
• Quantified binding reactions on individual microparticles with precision.

Conclusions:

• The developed two-photon fluorescence method provides a cost-effective and simple approach for measuring various biomolecules.
• This technique holds significant potential for both research and clinical applications, improving diagnostic capabilities.
• Enhanced sensitivity and dynamic range suggest a valuable advancement in bioanalytical methodologies.