Related Experiment Video
Updated: Jul 5, 2025
15:41
A Microfluidic Chip for the Versatile Chemical Analysis of Single Cells
Published on: October 15, 2013
14.9K
Novel Digital SERS-Microfluidic Chip for Rapid and Accurate Quantification of Microorganisms
Ping Wen1,2, Feng Yang3, Haixia Zhao1
1College of Optoelectronic Engineering, Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education, Key Disciplines Lab of Novel Micro-Nano Devices and System Technology, Chongqing University, Chongqing 400044, China.
Analytical Chemistry
|January 15, 2024
Summary
A novel digital surface-enhanced Raman spectroscopy (SERS)-microfluidic chip enables rapid, accurate microorganism detection. This SERS-microfluidic chip digitizes responses for precise quantification, overcoming previous detection challenges.
Area of Science:
- Analytical Chemistry
- Microbiology
- Biotechnology
Background:
- Quantitative detection of microorganisms is crucial for diagnostics and quality control.
- Traditional methods often face challenges with accuracy, reproducibility, and speed.
- Surface-enhanced Raman spectroscopy (SERS) offers high sensitivity but struggles with quantitative analysis due to signal variability.
Purpose of the Study:
- To develop a simple and novel digital SERS-microfluidic chip for rapid and accurate quantitative detection of microorganisms.
- To overcome the limitations of conventional SERS quantitative detection, such as intensity fluctuations and poor reproducibility.
- To demonstrate the chip's capability for precise microbial quantification using a yeast model.
Main Methods:
- Design and fabrication of a microfluidic chip featuring a high-density inverted pyramid microcavity (IPM) array.
- Utilizing SERS for scanning the IPM array and identifying characteristic Raman bands of target microorganisms.
- Implementing a "digitization" approach for SERS responses, enabling quantification via mathematical statistical techniques.
Main Results:
- Precise quantitative detection of yeast achieved in the concentration range of 10^6-10^9 cells/mL.
- Maximum relative standard deviation of 5.6% compared to cultivation-based calibration.
- Demonstrated mitigation of SERS intensity fluctuations and improved reproducibility for quantitative analysis.
Conclusions:
- The digital SERS-microfluidic chip provides a robust platform for reliable microorganism quantification.
- This technology addresses key challenges in SERS-based quantitative detection.
- The chip shows significant potential for diverse applications in rapid microbial detection, including pathogens and viruses.
