Spectroscopic evaluation of time-resolved fluoroimmunoassay

The lanthanide trivalence ion and its chelates are used for marking substance in time-resolved fluorescence immunoassay(TRFIA), marking the protein, hormone, antibody, nucleic acid probe or biologic alive cell, to measure the concentration of the analysis substance inside the reaction system with time-resolved fluorometry after the reaction system occurred, and attain the quantitative analysis's purpose. TRFIA has been therefore become a kind of new and more sensitive measure method after radioisotope marking, enzymatic marking, chemiluminescence, electrochemiluminescence, it primarily is decided by the special physics and chemistry characteristic of lanthanide trivalence ion and its chelates. In this paper, the result of spectroscopic evaluation of europium trivalence ion and its chelate, and the principle of time-resolved technology and fluorescence-enhanced technology is reported. At the same time, the experiment shows that excitation wavelength chosen between 336 and 337nm benefits the excitation and the energy transfer of chelate diketone of europium trivalence ion.