Electrochromic sensing platform based on steric hindrance effects for CEA detection.

Area of Science:

• Electrochemistry
• Biosensing
• Biomarker Detection

Background:

• Carcinoembryonic antigen (CEA) is a key tumor marker.
• Accurate and rapid detection of CEA is crucial for cancer diagnosis and treatment.
• Existing methods for CEA detection can be complex or time-consuming.

Purpose of the Study:

• To develop a novel electrochromic sensing platform for sensitive and selective detection of CEA.
• To utilize a bipolar electrode (BPE) system with Prussian blue (PB) as an indicator for CEA signaling.
• To establish a visual and rapid method for distinguishing cancer patients from healthy individuals based on serum CEA levels.

Main Methods:

• An electrochromic sensing platform was designed using a bipolar electrode (BPE) system.
• CEA aptamers were immobilized on the anode pole of the BPE for specific CEA capture.
• Prussian blue (PB) was used as an electrochromic indicator, with its deposition quantified to reflect CEA concentration.
• The platform was tested for CEA detection in human serum samples.

Main Results:

• The platform demonstrated high selectivity for target tumor proteins.
• The presence of CEA induced steric hindrance, leading to measurable changes in electrochemical currents.
• A quantitative relationship between electrochemical reactions and PB deposition allowed for reporting CEA concentration.
• The system could effectively distinguish between normal human serum CEA levels (5 ng mL(-1)) and potentially cancerous conditions.

Conclusions:

• The developed electrochromic sensing platform offers a fast, visual, and selective method for CEA detection.
• The biosensor shows great potential for point-of-care diagnostics due to its simplicity and the closed BPE system.
• This technology could aid in early cancer diagnosis and patient management.