Kinetics of Antibody Binding to Membranes of Living Bacteria Measured by a Photonic Crystal-Based Biosensor
Laboratoire de Physique de la Matière Vivante, IPHYS, École Polytechnique Fédérale de Lausanne (EPFL); Rte de la Sorge, 1015 Lausanne, Switzerland
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Academic Editors: Olga Korostynska and Alex Mason
Biosensors 2016, 6(4), 52; https://doi.org/10.3390/bios6040052
Received: 11 July 2016 / Revised: 31 August 2016 / Accepted: 28 September 2016 / Published: 11 October 2016
(This article belongs to the Special Issue Advances in Optical, RF, Microwave and Wireless BioSensing for Health, Environment and Agriculture)
Optical biosensors based on photonic crystal surface waves (PC SWs) offer a possibility to study binding interactions with living cells, overcoming the limitation of rather small evanescent field penetration depth into a sample medium that is characteristic for typical optical biosensors. Besides this, simultaneous excitation of s- and p-polarized surface waves with different penetration depths is realized here, permitting unambiguous separation of surface and volume contributions to the measured signal. PC-based biosensors do not require a bulk signal correction, compared to widely used surface plasmon resonance-based devices. We developed a chitosan-based protocol of PC chip functionalization for bacterial attachment and performed experiments on antibody binding to living bacteria measured in real time by the PCSW-based biosensor. Data analysis reveals specific binding and gives the value of the dissociation constant for monoclonal antibodies (IgG2b) against bacterial lipopolysaccharides equal to KD = 6.2 ± 3.4 nM. To our knowledge, this is a first demonstration of antibody-binding kinetics to living bacteria by a label-free optical biosensor.
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Keywords:
photonic crystal; label-free biosensor; bacteria; binding kinetics; antibody; ligand-receptor interaction
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MDPI and ACS Style
Rostova, E.; Ben Adiba, C.; Dietler, G.; Sekatskii, S.K. Kinetics of Antibody Binding to Membranes of Living Bacteria Measured by a Photonic Crystal-Based Biosensor. Biosensors 2016, 6, 52.
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