Zeolite-iron oxide integrated interdigitated electrode sensor for diagnosing cervical cancer

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Molecular Diagnostics

Background:

• Cervical cancer arises from precancerous cervical cell changes, primarily caused by Human Papillomavirus (HPV) infections.
• Early detection of HPV and associated cell changes is vital for cervical cancer prevention.
• Current screening methods like Pap smears are effective but costly and labor-intensive, driving the need for alternative approaches.

Purpose of the Study:

• To develop a sensitive and selective biosensor for the early detection of HPV-16 DNA.
• To utilize a zeolite-iron oxide (zeolite-IO) modified interdigitated electrode (IDE) for enhanced DNA biosensing.
• To establish a potential blood-based biomarker detection method for cervical cancer screening.

Main Methods:

• Immobilization of an HPV-16 DNA probe onto an amine-modified zeolite-IO layer on an IDE.
• Electrochemical detection of DNA-DNA hybridization between the immobilized probe and target HPV-16 DNA.
• Evaluation of sensor performance, including detection limit and specificity using mismatched DNA sequences and serum samples.

Main Results:

• The developed biosensor achieved a detection limit of 7.5 pM for the DNA-DNA duplex with a high R² value (0.9868).
• Control experiments demonstrated high specificity, with no significant current responses observed for single and triple mismatched DNA sequences.
• Successful identification of target HPV-16 DNA in a serum-spiked sample confirmed the sensor's ability for specific and selective detection.

Conclusions:

• The zeolite-IO modified IDE biosensor shows promise for sensitive and specific detection of HPV-16 DNA.
• This biosensor platform offers a potential alternative for early cervical cancer screening through blood-based biomarker detection.
• Further development could lead to more accessible and cost-effective diagnostic tools for HPV infections.