MEMBRANE-BASED ASSAYS USING TIME-RESOLVED FLUORESCENCE

摘要

A membrane-based assay device for detecting the presence or quantity of an analyte residing in a test sample is provided. The device utilizes time- resolved fluorescence to detect the signals generated by excited fluorescent labels. Because the labels can have relatively long emission lifetime, short - lived background interference can be practically eliminated through delayed fluorescence detection. In addition, the resulting fluorescent reader can ha ve a simple and inexpensive design. For instance, in one embodiment, the reader can utilize a silicon photodiodide and a pulsed light-emitting diode (LED) t o accurately excite labels and detect fluorescence on a membrane-based assay device without requiring the use of expensive components, such as monochromators or narrow emission band width optical filters.