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MB 543 NHS ester (FP-1631)

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Description

MB™ 543 is a very hydrophilic, water-soluble orange fluorescent dye. Structurally related to Alexa Fluor® 546 dye, MB™ 543 dye contains an additional, negatively charged sulfo group (SO3H) to improve water solubility and minimize self-quenching. Characteristic features of MB™ 543 are strong absorption, high fluorescence quantum yield, high photostability, and pH insensitivity from pH 3 to pH 10. MB™ 543 is a highly suitable dye for single-molecule detection applications and high-resolution microscopy such as PALM, dSTORM, STED etc.

The NHS Ester reacts specifically and efficiently with a primary amine (e.g., side chain of lysine residues or aminosilane-coated surfaces) at pH 7-9 to form a stable, covalent amide bond. The NHS ester (or succinimidyl ester) is the most popular tool for conjugating dyes to the primary amines of protein or antibody (Lys), amine-modified oligonucleotides, and other amine-containing molecules.

Specifications

Unit Size1 mg, 5 mg, 25 mg, 100 mg
ReactivityPrimary amine
Abs/Em Maxima543/566 nm
Extinction coefficient105,000 cm-1M-1
SolubilityWater, DMSO, DMF
Spectrally similar dyesAlexa Fluor® 546, CF® 543, TAMRA
Molecular weight916.68
Storage Conditions-20°C.
Shipping ConditionsAmbient temperature

Abs/Em Spectra

MB543

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