Related Experiment Video
Updated: Apr 27, 2026
13:00
Intranasal Immunization and Milk Collection in Studies of Maternal Immunization in New Zealand White Rabbits Oryctolagus cuniculus
Published on: July 31, 2021
3.3K
Cellphone-based detection platform for rbST biomarker analysis in milk extracts using a microsphere fluorescence
Susann K J Ludwig1, Hongying Zhu, Stephen Phillips
1RIKILT Wageningen UR, P.O. Box 230, 6700 AE, Wageningen, The Netherlands.
Analytical and Bioanalytical Chemistry
|June 29, 2014
Summary
A new cellphone-based immunoassay can detect anti-recombinant bovine somatotropin (rbST) antibodies in milk. This on-site prescreening method offers an efficient and economical alternative to traditional laboratory analysis for residue monitoring.
Area of Science:
- Food Safety and Analytical Chemistry
- Biosensing and Immunoassays
- Mobile Health Technology
Background:
- Current food chain residue monitoring relies on costly and inefficient laboratory analysis.
- Recombinant bovine somatotropin (rbST) use in cattle is illegal in the EU and a public health concern in the USA.
- On-site prescreening can significantly improve the efficiency and economics of residue monitoring.
Purpose of the Study:
- To develop a cellphone-based platform for on-site detection of anti-rbST antibodies in milk.
- To assess the feasibility and performance of a microsphere fluorescence immunoassay using a cellphone imaging platform.
- To provide a cost-effective and efficient alternative to traditional laboratory testing for rbST residues.
Main Methods:
- Development of a cellphone attachment for microsphere fluorescence immunoassay.
- Utilizing quantum dot (QD)-coupled antibodies to label rbST biomarker captured on paramagnetic microspheres.
- Employing a custom Android application for analyzing fluorescence and dark-field microimages captured by the cellphone camera.
- Benchmarking the cellphone-based platform against a planar imaging array.
Main Results:
- Successful application of the cellphone-based immunoassay to milk extracts from rbST-treated and untreated cows.
- Achieved an 80% true-positive rate and 95% true-negative rate for rbST biomarker detection.
- The cellphone platform demonstrated comparable performance to a more sophisticated planar imaging array.
- Validated the potential for significant reduction in samples requiring laboratory analysis.
Conclusions:
- Cellphone-based on-site analysis offers a highly efficient and economical approach for future residue monitoring.
- This technology can streamline the monitoring process by enabling early-stage sample screening.
- The developed platform holds promise for improving food safety and public health surveillance.
