Skip to main content

Research Repository

Advanced Search

The use of coated paramagnetic particles as a physical label in a magneto-immunoassay

Luxton, R.; Hawkins, P.; Richardson, J.


Richard Luxton
Research Centre Director-IBST/Professor

P. Hawkins


An ideal label for use in an immunoassay would require no further chemical or electromagnetic stimulation prior to its detection and would be free from interference from the sample matrix. Micron sized paramagnetic particles are able to perturb magnetic fields. This perturbation can be directly detected using a suitable electronic device and is independent of the sample matrix. In this study coated paramagnetic particles were used as a physical label in a non-competitive solid phase 'sandwich' assay for the detection of human transferrin. The transferrin acted as a 'biological bridge' allowing a dose dependant immobilization of the paramagnetic particles to a polyethylene terephthalate solid phase. Quantitation of the paramagnetic label was achieved using an electronic detection system allowing a linear dose response with a femtomolar detection limit (260 fmol). © 2001 Elsevier Science B.V. All rights reserved.


Luxton, R., Hawkins, P., & Richardson, J. (2001). The use of coated paramagnetic particles as a physical label in a magneto-immunoassay. Biosensors and Bioelectronics, 16(9-12), 989-993.

Journal Article Type Conference Paper
Publication Date Nov 7, 2001
Journal Biosensors and Bioelectronics
Print ISSN 0956-5663
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 16
Issue 9-12
Pages 989-993
Keywords magneto-immunoassay, paramagnetic particles, transferrin, magnetometer, polyethylene terephthalate, solid phase
Public URL
Publisher URL
Additional Information Additional Information : The technology described in this paper has received international recognition in that a Spanish company has undertaken a collaborative project to develop an environmental measurement system for bacteria in water, based on magnetic detection of paramagnetic particles and was the basis for funding of two further projects sponsored by DSTL.