The advantage of using europium chelates, as compared to fluorescein, in time-resolved fluorescence competitive-binding assays is:

Question

Quizplus · Accepted Answer

Europium chelates have a fluorescence lifetime of approximately 100 microseconds, as compared to 5 nanoseconds for fluorescein.With the appropriate instrumentation, a distinction can be made between short-lived, background fluorescence interferences and true fluorescence produced by the assay.This significantly improves the sensitivity of the assay.

The Advantage of Using Europium Chelates, as Compared to Fluorescein