Aptamer-based electrochemical biosensor for interferon gamma detection.

Area of Science:

• Biosensor Development
• Electrochemical Aptasensors
• Interferon-gamma Detection

Background:

• Interferon-gamma (IFN-γ) is a critical cytokine in immune responses.
• Accurate and sensitive detection of IFN-γ is vital for diagnosing and monitoring diseases.
• Existing immunoassay methods can be complex and time-consuming.

Purpose of the Study:

• To develop a novel electrochemical DNA aptamer-based biosensor for sensitive IFN-γ detection.
• To demonstrate the biosensor's specificity, sensitivity, and reusability.
• To provide a simpler alternative to traditional IFN-γ detection methods.

Main Methods:

• Immobilization of a DNA hairpin aptamer conjugated with a methylene blue redox tag on a gold electrode.
• Utilizing the conformational change of the aptamer upon IFN-γ binding to alter electron-transfer efficiency.
• Quantification of IFN-γ concentration via square wave voltammetry (SWV).

Main Results:

• Achieved a limit of detection of 0.06 nM for IFN-γ with a linear response up to 10 nM.
• Demonstrated high specificity for IFN-γ in the presence of serum proteins.
• Successfully regenerated and reused the aptasensor multiple times.

Conclusions:

• The developed electrochemical aptasensor provides a simple, sensitive, and direct method for IFN-γ detection.
• This biosensor eliminates the need for multiple washing steps and reagents common in immunoassays.
• Potential applications include immunology, cancer research, and infectious disease monitoring.