Chirality-based Au@Ag Nanorod Dimers Sensor for Ultrasensitive PSA Detection

Area of Science:

• Nanotechnology
• Biomedical Engineering
• Analytical Chemistry

Background:

• Prostate-specific antigen (PSA) is a key biomarker for prostate cancer detection.
• Ultrasensitive detection methods are crucial for early diagnosis and effective treatment.
• Existing biosensors face challenges in sensitivity and specificity.

Purpose of the Study:

• To develop a novel biosensor for ultrasensitive prostate-specific antigen (PSA) detection.
• To enhance the circular dichroism signal amplification for improved sensitivity.
• To establish a versatile platform for cancer biomarker detection.

Main Methods:

• Assembly of gold nanorod (Au NR) dimers.
• Deposition of a silver shell on Au NR dimers to amplify circular dichroism signals.
• Detection of target PSA within a specific concentration range.

Main Results:

• Achieved ultrasensitive detection of PSA with a limit of detection as low as 0.076 aM.
• Demonstrated high specificity for PSA detection.
• Observed detection within the range of 0.1 to 50 aM target PSA.

Conclusions:

• The developed Au NR dimer-based biosensor offers ultrasensitive and specific PSA detection.
• Silver shell amplification significantly enhances the biosensor's performance.
• This platform holds potential for the general detection of various cancer biomarkers.