Related Experiment Video
Updated: Aug 11, 2025
06:42
Wide-field Fluorescent Microscopy and Fluorescent Imaging Flow Cytometry on a Cell-phone
Published on: April 11, 2013
23.7K
Inexpensive High-Throughput Multiplexed Biomarker Detection Using Enzymatic Metallization with Cellphone-Based
Neda Rafat1, Lee Brewer1, Nabojeet Das1
1Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.
ACS Sensors
|February 8, 2023
Summary
A new smartphone-based biosensing platform enables low-cost, high-throughput detection of multiple disease biomarkers from small samples. This technology offers sensitive and quantitative results, advancing disease diagnosis and outcome prediction.
Area of Science:
- Biomedical Engineering
- Point-of-Care Diagnostics
- Biosensing Technology
Background:
- Multiplexed biomarker detection is crucial for accurate disease diagnosis and prognosis.
- Enzyme-linked immunosorbent assay (ELISA) is a standard but costly method, limited to single biomarker detection in centralized labs.
- Existing methods lack the sensitivity, throughput, and portability required for widespread clinical application.
Purpose of the Study:
- To develop a low-cost, portable biosensing platform for high-throughput, multiplexed biomarker detection.
- To enable sensitive and quantitative biomarker analysis from minimal clinical sample volumes (<1 μL).
- To create a smartphone-based system for accessible and reproducible disease diagnostics.
Main Methods:
- A novel platform utilizes enzymatic metallization to convert biomarker binding into localized, dry-stable silver metal spots.
- The darkness of silver spots, proportional to biomarker concentration, is quantified using computer vision via a custom smartphone application.
- The system was validated for multiplexed detection of viral antigen-specific antibodies in COVID-19 patient and vaccine recipient serum.
Main Results:
- The platform demonstrated high-throughput, sensitive, and quantitative multiplexed biomarker detection.
- Distinct antibody "fingerprints" were identified in serum samples from convalescent COVID-19 patients and vaccine recipients.
- The smartphone application enabled easy optical detection and reproducible quantification of biomarkers.
Conclusions:
- This smartphone-based biosensing platform offers a cost-effective and portable solution for multiplexed biomarker analysis.
- The technology has significant potential to improve disease diagnosis, outcome prediction, and monitoring of immune responses.
- The developed system overcomes limitations of traditional methods, enabling advanced diagnostics at the point of care.
