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Related Experiment Video

Updated: Nov 2, 2025

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Mixing during Trapping Enabled a Continuous-Flow Microfluidic Smartphone Immunoassay Using Acoustic Streaming.

Xian Chen1, Yuan Ning1, Shuting Pan1

  • 1State Key Laboratory of Precision Measuring Technology & Instruments and College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China.

ACS Sensors
|June 9, 2021
PubMed
Summary

This study introduces an acoustic streaming tweezers microfluidic immunoassay for point-of-care (POC) biosensing. The novel system enhances light intensity for smartphone detection, enabling rapid prostate-specific antigen (PSA) analysis.

Keywords:
acoustic streamingcontinuous-flow microfluidicsimmunosensorpoint-of-caresmartphone readout

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Area of Science:

  • Microfluidics
  • Biosensing
  • Immunodiagnostics

Background:

  • Smartphone-based microfluidic chemiluminescence immunoassays show promise for point-of-care (POC) applications.
  • Limited light emission in small sample volumes and complex sample preparation hinder clinical applicability.
  • Existing systems struggle to achieve clinically accepted detection ranges with standalone smartphone detectors.

Purpose of the Study:

  • To develop a novel acoustic streaming tweezers-enabled microfluidic immunoassay for integrated sample preparation and detection.
  • To overcome limitations of low light intensity and cumbersome sample processing in POC biosensing.
  • To enable direct signal capture using a standard smartphone camera for enhanced portability.

Main Methods:

  • Integration of probe particle purification, reaction, and sensing on a single microfluidic chip under continuous-flow conditions.
  • Utilizing high-speed microscale vortexes generated by acoustic streaming for dynamic particle trapping, washing, and active mixing.
  • Employing heterogeneous particle-based immunoassay with enhanced biomarker capture efficiency.

Main Results:

  • Demonstrated on-chip integration of sample preparation and detection, reducing assay time to under 15 minutes.
  • Achieved a limit of detection of 0.2 ng/mL for prostate-specific antigen (PSA) using only 10 μL of sample.
  • Obtained a wide dynamic response range (0.3–10 ng/mL) with enhanced chemiluminescent light intensity detectable by a smartphone camera.

Conclusions:

  • The developed acoustic streaming tweezers microfluidic platform offers an integrated solution for POC biosensing.
  • The system significantly improves light intensity and biomarker capture, enabling sensitive and rapid detection.
  • This portable and efficient platform holds potential for various on-site diagnostic applications.