Dual-cardiac marker capillary waveguide fluoroimmunosensor based on tyramide signal amplification.

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Clinical Diagnostics

Background:

• Early diagnosis of acute myocardial infarction (AMI) relies on serum markers.
• Creatine kinase-MB (CK-MB) and cardiac troponin I (cTnI) are key cardiac biomarkers.
• Current diagnostic methods can be time-consuming.

Purpose of the Study:

• To develop a fast and highly sensitive capillary waveguide fluoroimmunosensor.
• To enable simultaneous determination of cTnI and CK-MB in serum samples.
• To improve early diagnosis of acute myocardial infarction.

Main Methods:

• Fabrication of a dual-analyte immunosensor using antibody-modified glass capillaries.
• Utilized tyramide signal amplification for enhanced fluorescence detection.
• Employed a capillary waveguide system for fluorescence signal collection and measurement.

Main Results:

• Achieved low detection limits: 0.2 ng/mL for cTnI and 0.5 ng/mL for CK-MB.
• Demonstrated a total assay time of 30 minutes, significantly faster than conventional methods.
• Exhibited high accuracy and repeatability with coefficients of variation below 10%.

Conclusions:

• The capillary waveguide fluoroimmunosensor provides a rapid and reliable method for AMI diagnosis.
• The developed sensor offers high sensitivity and accuracy for simultaneous biomarker detection.
• This technology has the potential to significantly improve clinical decision-making in cardiology.