Biomarker detection based on nanoparticle-induced ultrasonic Rayleigh scattering

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Biochemical Sensing

Background:

• Current ultrasonic biochemical detection methods are costly, unreliable, and lack repeatability.
• Existing techniques require direct modification of device surfaces, hindering rapid, low-cost testing.

Purpose of the Study:

• To develop a novel, low-cost, and reliable ultrasonic method for biochemical detection.
• To demonstrate the feasibility of using nanoparticles with capacitive micromachined ultrasonic transducers (CMUTs) for biomarker detection.

Main Methods:

• Developed a detection mechanism based on Rayleigh scattering of acoustic waves by nanoparticles.
• Utilized antibodies on an insertable substrate coupled with CMUTs and gold nanoparticles (AuNPs).
• Established a detection theory and verified parameters using various nanoparticles for CA19-9 antigen detection.

Main Results:

• Successfully measured CA19-9 antigen concentrations using a 1 MHz CMUT chip.
• Observed a decrease in receiving voltage with increasing CA19-9 concentration (0.1-1000 U/mL).
• Demonstrated negligible interference from other common biological markers, confirming robustness.

Conclusions:

• The developed CMUT-nanoparticle system offers a feasible and robust platform for sensitive biochemical detection.
• This novel approach overcomes limitations of current methods, enabling low-cost, rapid biomarker analysis.
• The technology shows promise for applications in medical diagnosis and disease monitoring.