FAM-dT phosphoramidite

FAM (Fluorescein) Oligonucleotide synthesis Phosphoramidites

Cat. #	Quantity	Price	Lead time
13460	100 mg	$150	in stock
23460	250 mg	$275	in stock
43460	1 g	$950	in stock
63460	5 g	$3830	in stock
83460	10 g	please inquire	in stock

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This phosphoramidite allows fluorescein (FAM) to be introduced into any position in the oligonucleotide sequence during synthesis by the phosphoramidite method (in the middle of the chain, at the 5’- and 3’-terminus). The reagent is a conjugate of deoxythymidine phosphoramidite and 6-isomer of FAM. Modification is performed during oligonucleotide synthesis by substituting standard dT phosphoramidite with fluorescein-dT phosphoramidite. This modification does not affect exonuclease or polymerase activity.

For modification with fluorescein at the 5’-terminus use FAM phosphoramidite, 6-isomer.

Usage

Coupling: 10 minutes

Deprotection: standard conditions using ammonium hydroxide; deprotection time depends on oligonucleotide composition and nucleobase protecting groups (deprotection for 17 h at 55 °С removes all protecting groups from standard nucleobases). AMA (solution of 30% ammonium hydroxide/40% aqueous methylamine 1:1 v/v) can be used with ~5% of non-fluorescent side product forming. To avoid formation of the side product, start deprotection with ammonium hydroxide (30 min at room temperature), then add an equal volume of 40% aqueous methylamine and continue deprotection as required with AMA (e.g. 10 min at 65 °C).

Structure of Fluorescein-dT phosphoramidite

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Absorption and emission spectra of FAM

General properties

Appearance:	off white powder
Molecular weight:	1423.54
Molecular formula:	C₇₉H₈₇N₆O₁₇P
Solubility:	good in acetonitrile, DCM
Quality control:	NMR ¹H, NMR ³¹P, HPLC-MS
Storage conditions:	Storage: 12 months after receival at -20°C in the dark. Transportation: at room temperature for up to 3 weeks. Avoid prolonged exposure to light. Desiccate.
MSDS:	Download
	Product specifications

Spectral properties

Excitation/absorption maximum, nm:	492
ε, L⋅mol⁻¹⋅cm⁻¹:	74000
Emission maximum, nm:	517
Fluorescence quantum yield:	0.93
CF₂₆₀:	0.22
CF₂₈₀:	0.17

Oligo synthesis details

Diluent:

acetonitrile

This Product is offered and sold for research purposes only. It has not been tested for safety and efficacy in food, drug, medical device, cosmetic, commercial or any other use. Supply does not express or imply authorization to use for any other purpose, including, without limitation, in vitro diagnostic purposes, in the manufacture of food or pharmaceutical products, in medical devices or in cosmetic products.