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Multiphoton Ligand-Enhanced Excitation of Lanthanides

Multiphoton Ligand-Enhanced Excitation of Lanthanides

Grzegorz Piszczek, Badri P Maliwal, Ignacy Gryczynski, Jonathan Dattelbaum, Joseph R Lakowicz

J Fluoresc. 2001 Jun;11(2):101-107.

PMID: 32153342

Abstract:

We describe multiphoton excitation of the lanthanides europium (Eu3+) and terbium (Tb3+) when these ions are complexed with nucleic acids, proteins, and fluorescent chelators. In all cases excitation occurs by multiphoton absorption of the sensitizers. For the nucleotide GDP and an oligonucleotide with several guanines, the sensitized emission of Tb3+ excited at 776 nm indicated a three-photon process. For Tb3+ bound to the wild-type troponin C and a single tryptophan mutant (26W), excitation at 794 nm was also close to a three-photon process. For lanthanide chelators containing various sensitizers, we observed three-photon excitation in the case of methyl anthranilate, a mixuture of two- and three-photon excitation for carbostyril 124, and a two-photon process with a coumarin derivative. In the case of coumarin-sensitized emission of Eu3+ varied from a two- to a three-photon process at wavelengths ranging from 780 to 880 nm. The sensitized luminescence also shows significantly higher photostability compared to the fluorescence from the organic fluorophores alone. These results suggest the use of multiphoton-induced sensitized lanthanide fluorescence in biochemistry and cellular imaging.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP19840994	Carbostyril 124		19840-99-4	Price

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