Catalytic buffer for Click chemistry contains copper(II), triethylammonium acetate, pH 7, and DMSO. The buffer is a 1.5x concentrate, a ready-to-use reagent for the modification of nucleic acids such as oligonucleotides, or small molecules.
Copper(II) should be reduced to copper(I) prior to reaction. Ascorbic acid is the recommended reductant.
Coumarin 343 is a blue emitting fluorophore that can serve as a FRET donor for fluorescein (FAM). This azide derivative can be conjugated with alkynes by Click chemistry. An extended linker arm between the fluorophore and the azide group enhances solubility, and provides spatial separation between the dye and the biomolecule.
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