Long Trebler Phosphoramidite

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Dendrimers are discrete, highly branched, monodispersed polymers that possess patterns reminiscent of the branching of trees. Plain and mixed oligonucleotide dendrimers can be synthesized using novel doubling and trebling phosphoramidite synthons.1,2 Dendrimers offer the following advantages. Incorporation of label using g-32P-ATP and polynucleotide kinase increases in proportion to the number of 5'-ends. Fluorescent signal also increases in proportion to the number of 5'-ends, if spacers are incorporated between the labels and the ends of the branches. When using a dendrimeric oligonucleotide as a PCR primer, the strand bearing the dendrimer is resistant to degradation by T7 Gene 6 exonuclease making it easy to convert the double-stranded product of the PCR to a multiply labelled, single-stranded probe. Enhanced stability of DNA dendrimers makes them useful as building blocks for the 'bottom up' approach to nano-assembly. These features also suggest applications in DNA chip technology when higher temperatures are required, for example, to melt secondary structure in the target.



  • Coupling: Synthesis should be carried out on 1000Å support. A 15 minute coupling time using DCI activator (30-3150-xx) is recommended for the trebler addition.
  • Deprotection: No changes needed from standard method recommended by synthesizer manufacturer.
Diluent Anhydrous Acetonitrile
Storage Freezer storage, -10 to -30°C, dry
Stability 1-2 days

Dilution/Coupling Data

The table below show pack size data and, for solutions, dilution and approximate coupling based on normal priming procedures.

ABI 392/394

Catalog # Pack Size Grams/Pack 0.1M Dil. (mL) Approximate Number of Additions
LV40 LV200 40nm 0.2μm 1μm 10μm
10-1925-02 0.25 g .25grams 1.69 43 25.8 16.13 11.73 8.6 2.15
10-1925-90 100 µmol .148grams 1 20 12 7.5 5.45 4 1


Catalog # Pack Size Grams/Pack Dilution (mL) Approximate Number of Additions
Molarity 50nm 0.2μm 1μm 15μm
10-1925-02 0.25 g .25grams 2.53 0.07 44.2 27.63 20.09 2.76
10-1925-90 100 µmol .148grams 1.5 0.07 23.6 14.75 10.73 1.48


1 M.S. Shchepinov, I.A. Udalova, A.J. Bridgman, and E.M. Southern, Nucleic Acids Res, 1997, 25, 4447- 4454.
2 M.S. Shchepinov, K.U. Mir, J.K. Elder, M.D. Frank-Kamenetskii, and E.M. Southern, Nucleic Acids Res, 1999, 27, 3035-41.