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An acousto-optic tunable filter-surface plasmon resonance (AOTF-SPR) immunosensor based on wavelength-modulation was applied to detect fibronectin by direct, sandwich and colloidal Au-enhanced immunoassay. The design of the wavelength-modulation AOTF-SPR immunosensor is based on fixing the incident angle of light and measuring the reflected intensity of light in the wavelength range spanning 440–790nm...
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