Aggregachromic Fluorogenic Asymmetric Cyanine Probes for Sensitive Detection of Heparin and Protamine

Area of Science:

• Analytical Chemistry
• Biochemistry
• Materials Science

Background:

• Accurate heparin monitoring is critical for anticoagulant therapy but faces detection challenges.
• Existing methods may lack the sensitivity or speed required for clinical settings.
• Developing novel probes is essential for improving heparin detection.

Purpose of the Study:

• To develop and optimize a fluorogenic platform for ultrasensitive heparin detection.
• To synthesize and characterize novel cyanine-based fluorescence probes.
• To evaluate the probes' performance in detecting heparin and protamine.

Main Methods:

• Synthesis of three analogous asymmetric cyanine fluorogenic probes.
• Characterization using steady-state absorption, fluorescence, and circular dichroism spectroscopy.
• Assessment of probe response to heparin and protamine, including limit of detection (LOD).

Main Results:

• Probes demonstrated a highly sensitive "turn-on" fluorescence response to heparin.
• Achieved a low limit of detection (LOD) for heparin in the 10-25 nM range.
• Observed a visible colorimetric change and successful detection of protamine.

Conclusions:

• The developed fluorogenic probes enable ultrasensitive and rapid heparin detection.
• The platform shows potential for clinical applications and monitoring anticoagulant therapy.
• The probe-heparin complex can also be utilized for sensitive protamine detection.