Dual analyte flow injection fluorescence immunoassays using thiophilic gel reactors and synchronous scanning...

Area of Science:

• Analytical Chemistry
• Biochemistry
• Immunology

Background:

• Heterogeneous immunoassays require effective separation of bound and unbound molecules.
• Automation is crucial for increasing throughput and reproducibility in immunoassays.
• Developing dual-analyte systems enhances diagnostic efficiency by measuring multiple targets simultaneously.

Purpose of the Study:

• To automate heterogeneous fluorescence immunoassays using flow injection.
• To develop a method for simultaneous detection of dual analytes.
• To validate the system's performance for clinical applications.

Main Methods:

• Utilized flow injection manifolds with thiophilic gel solid phase reactors for antibody-bound and unbound analyte separation.
• Employed pH-sensitive fluorescent labels for antibody elution triggered by ionic strength changes.
• Implemented high-speed synchronous fluorescence scanning for parallel detection of dual fluorophores.

Main Results:

• Achieved near 100% analyte recovery with a relative standard deviation of 5-6%.
• Demonstrated a sampling rate of 20 samples per hour.
• Exemplified the system's capability through simultaneous analysis of serum albumin and transferrin with minimal spectroscopic interference.

Conclusions:

• The developed automated system offers a robust and efficient platform for heterogeneous fluorescence immunoassays.
• The dual-analyte detection capability significantly advances diagnostic potential.
• This approach provides high accuracy and precision for simultaneous biomarker quantification.