Variable wavelength surface plasmon resonance (SPR) in biosensing.
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 x 10(7) 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 10mM 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.
Eum
Nyeon-Sik
NS
Department of Agriculture and Biological Engineering, Purdue University, 225 South University Street, West Lafayette, IN 47907, USA.
Kim
Do-Eok
DE
Yeom
Se-Hyuk
SH
Kang
Byoung-Ho
BH
Kim
Kyu-Jin
KJ
Park
Chang-Sub
CS
Kang
Shin-Won
SW
D015374:Biosensing Techniques / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007118:Immunoassay / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*