Variable wavelength surface plasmon resonance (SPR) in biosensing |
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Authors: | Nyeon-Sik Do-Eok Kim Se-Hyuk Yeom Byoung-Ho Kang Kyu-Jin Kim Chang-Sub Park Shin-Won |
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Affiliation: | aDepartment of Agriculture and Biological Engineering, Purdue University, 225 South University Street, West Lafayette, IN 47907, USA;bSchool of Electrical Engineering and Computer Science, Kyungpook National University, Daegu 702-701, South Korea;cDepartment of Sensor and Display Engineering, Kyungpook National University, Daegu 702-701, South Korea |
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Abstract: | In this study, we fabricated a novel variable wavelength surface plasmon resonance (SPR) sensor, which detects resonance conditions such as a maximum attenuation wavelength, measuring change of microscopic refractive index. Such a change was measured to detect a salmonella antigen–antibody reaction and a penicillinase–penicillin reaction. Our experiments were performed after immobilizing a salmonella antibody on the sensor chip. We measured the shift in resonant wavelength during the antigen–antibody reaction for 30 min by injecting 5 × 107 cells/ml concentration of salmonella antigen solution into the sample chamber. Also, after immobilizing penicillinase on the sensor chip, we measured the shift in resonant wavelength during the reaction. Penicillin solution at 10 mM was injected into the sample chamber. The shift of resonant wavelength for each experiment was measured using a white light source, multimode optical fiber, a part of sensor chip and an optical spectrum analyzer.As a result, the resonant wavelength shifted about 0.26 nm/min owing to the salmonella antibody–antigen reaction. Thus, we could detect the change in wavelength (0.8 nm/min) through the interaction of penicillin and penicillinase for 15 min using variable wavelength SPR sensor. |
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Keywords: | Variable wavelength Surface plasmon resonance Salmonella Penicillin |
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