Médéric Loyez1,2, Mathilde Wells3, Stéphanie Hambÿe3, François Hubinon4, Bertrand Blankert3, Ruddy Wattiez5, Christophe Caucheteur4. 1. Proteomics and Microbiology Department, University of Mons, Champ de Mars 6, 7000, Mons, Belgium. mederic.loyez@umons.ac.be. 2. Electromagnetism and Telecommunications Department, University of Mons, Bld. Dolez 31, 7000, Mons, Belgium. mederic.loyez@umons.ac.be. 3. Laboratory of Pharmaceutical Analysis, University of Mons, Avenue Maistriau 15, 7000, Mons, Belgium. 4. Electromagnetism and Telecommunications Department, University of Mons, Bld. Dolez 31, 7000, Mons, Belgium. 5. Proteomics and Microbiology Department, University of Mons, Champ de Mars 6, 7000, Mons, Belgium.
Abstract
BACKGROUND: Early malaria diagnosis and its profiling require the development of new sensing platforms enabling rapid and early analysis of parasites in blood or saliva, aside the widespread rapid diagnostic tests (RDTs). METHODS: This study shows the performance of a cost-effective optical fiber-based solution to target the presence of Plasmodium falciparum histidine-rich protein 2 (PfHRP2). Unclad multimode optical fiber probes are coated with a thin gold film to excite Surface Plasmon Resonance (SPR) yielding high sensitivity to bio-interactions between targets and bioreceptors grafted on the metal surface. RESULTS: Their performances are presented in laboratory conditions using PBS spiked with growing concentrations of purified target proteins and within in vitro cultures. Two probe configurations are studied through label-free detection and amplification using secondary antibodies to show the possibility to lower the intrisic limit of detection. CONCLUSIONS: As malaria hits millions of people worldwide, the improvement and multiplexing of this optical fiber technique can be of great interest, especially for a future purpose of using multiple receptors on the fiber surface or several coated-nanoparticles as amplifiers.
BACKGROUND: Early malaria diagnosis and its profiling require the development of new sensing platforms enabling rapid and early analysis of parasites in blood or saliva, aside the widespread rapid diagnostic tests (RDTs). METHODS: This study shows the performance of a cost-effective optical fiber-based solution to target the presence of Plasmodium falciparum histidine-rich protein 2 (PfHRP2). Unclad multimode optical fiber probes are coated with a thin gold film to excite Surface Plasmon Resonance (SPR) yielding high sensitivity to bio-interactions between targets and bioreceptors grafted on the metal surface. RESULTS: Their performances are presented in laboratory conditions using PBS spiked with growing concentrations of purified target proteins and within in vitro cultures. Two probe configurations are studied through label-free detection and amplification using secondary antibodies to show the possibility to lower the intrisic limit of detection. CONCLUSIONS: As malaria hits millions of people worldwide, the improvement and multiplexing of this optical fiber technique can be of great interest, especially for a future purpose of using multiple receptors on the fiber surface or several coated-nanoparticles as amplifiers.
Authors: Nelson Lee; Michelle L Gatton; Anita Pelecanos; Martin Bubb; Iveth Gonzalez; David Bell; Qin Cheng; James S McCarthy Journal: J Clin Microbiol Date: 2012-01-18 Impact factor: 5.948
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Authors: Carolyne M Kifude; Halli G Rajasekariah; David J Sullivan; V Ann Stewart; Evelina Angov; Samuel K Martin; Carter L Diggs; John N Waitumbi Journal: Clin Vaccine Immunol Date: 2008-03-26