Luminescent lanthanide chelates and methods of use
First Claim
1. A method of detecting a portion of a sample by luminescence, said method comprising the steps of:
- contacting a sample portion with a luminescent complex of a lanthanide chelate and a lanthanide capable of binding said chelate with an equilibrium constant of at least 109 M-1 ;
said lanthanide chelate comprising a lanthanide chelator covalently joined to a sensitizer. wherein a complex of said chelate and said lanthanide is capable of enhanced lanthanide luminescence, and said sensitizer comprises a polynuclear heterocyclic aromatic compound of the general formula;
##STR6## wherein X comprises an atom from periodic group 5 or 6, wherein a single position 2-8 carbon atom of said sensitizer is substituted with a linking up through which said sensitizer is covalently joined to said chelator;
exposing said sample portion to light at a first wavelength capable of inducing a first electronic transition in said chelate;
detecting a localized emission of light from said sample at a second wavelength, wherein said second wavelength is longer than said first wavelength and results from a second electronic transition in said chelate;
wherein the localized detection of said emission of light correlates with the localized presence of said sample portion.
0 Assignments
0 Petitions
Accused Products
Abstract
The invention provides lanthanide chelates capable of intense luminescence. The celates comprise a lanthanide chelator covalently joined to a coumarin-like or quinolone-like sensitizer. Exemplary sensitzers include 2- or 4-quinolones, 2- or 4-coumarins, or derivatives thereof e.g. carbostyril 124 (7-amino-4-methyl-2-quinolone), coumarin 120 (7-amino-4-methyl-2-coumarin), coumarin 124 (7-amino-4-(trifluoromethyl)-2-coumarin), aminomethyltrimethylpsoralen, etc.
The chelates form high affinity complexes with lanthanides, such as terbium or europium, through chelator groups, such as DTPA. The chelates may be coupled to a wide variety of compounds to create specific labels, probes, diagnostic and/or therapeutic reagents, etc. The chelates find particular use in resonance energy transfer between chelate-lanthanide complexes and another luminescent agent, often a fluorescent non-metal based resonance energy acceptor. The methods provide useful information about the structure, conformation, relative location and/or interactions of macromolecules.
-
Citations
20 Claims
-
1. A method of detecting a portion of a sample by luminescence, said method comprising the steps of:
-
contacting a sample portion with a luminescent complex of a lanthanide chelate and a lanthanide capable of binding said chelate with an equilibrium constant of at least 109 M-1 ; said lanthanide chelate comprising a lanthanide chelator covalently joined to a sensitizer. wherein a complex of said chelate and said lanthanide is capable of enhanced lanthanide luminescence, and said sensitizer comprises a polynuclear heterocyclic aromatic compound of the general formula;
##STR6## wherein X comprises an atom from periodic group 5 or 6, wherein a single position 2-8 carbon atom of said sensitizer is substituted with a linking up through which said sensitizer is covalently joined to said chelator;exposing said sample portion to light at a first wavelength capable of inducing a first electronic transition in said chelate; detecting a localized emission of light from said sample at a second wavelength, wherein said second wavelength is longer than said first wavelength and results from a second electronic transition in said chelate; wherein the localized detection of said emission of light correlates with the localized presence of said sample portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification