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Related Experiment Video

Updated: Jul 11, 2025

Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles

Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles

Published on: March 13, 2017

Expanded Multiplexing on Sensor-Constrained Microfluidic Partitioning Systems.

Pavan K Kota¹, Hoang-Anh Vu¹, Daniel LeJeune²

¹Department of Bioengineering, Rice University, Houston, Texas 77005, United States.

Analytical Chemistry

|November 16, 2023

Summary

This summary is machine-generated.

We present Sparse Poisson Recovery (SPoRe), a scalable method to multiplex analytes using microfluidic partitioning. This approach enhances digital PCR for infection diagnostics by overcoming channel limitations and enabling accurate bacterial quantification.

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Area of Science:

Biotechnology
Molecular Diagnostics
Microfluidics

Background:

Microfluidic partitioning, such as droplets or nanowells, captures analytes following a Poisson distribution.
Maximum Likelihood Estimation (MLE) is commonly used for inferring analyte concentration in diagnostics.
Existing methods face limitations in multiplexing capacity, especially in digital PCR.

Purpose of the Study:

To present a scalable approach for multiplexing analytes using microfluidic partitioning.
To generalize Maximum Likelihood Estimation (MLE) and extend the Sparse Poisson Recovery (SPoRe) algorithm.
To demonstrate the first in vitro application of SPoRe with droplet digital PCR (ddPCR) for infection diagnostics.

Main Methods:

Generalizing MLE with microfluidic partitioning and extending the Sparse Poisson Recovery (SPoRe) algorithm.
Implementing SPoRe with a two-channel droplet digital PCR (ddPCR) system for bacterial identification.
Utilizing 16S ddPCR with five nonspecific probes to barcode nine pathogen genera.

Main Results:

Successfully recovered bacterial concentrations from pooled droplet data, despite individual droplet ambiguity.
Achieved stable quantification down to approximately 200 total copies of the 16S gene per sample.
Demonstrated expanded multiplexing capacity for digital PCR by circumventing channel limitations.

Conclusions:

SPoRe offers a scalable solution for analyte multiplexing in microfluidic partitioning systems.
The developed framework and scaling rules can impact various biosensing applications.
This approach enables robust microbial DNA quantification for clinical diagnostics.