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The 5-ATTO 550 modification incorporates an ATTO™ 550 dye (ATTO-TEC GmbH) at the 5' terminus of an oligonucleotide. With strong absorption and high fluorescence quantum yield, ATTO 550 can be used in a wide array of applications, including single molecule detection, high-resolution microscopy, and fluorescence in-situ hybridization (FISH). ATTO 550 is a cationic dye and can be used as a substitute for Alexa Fluor® 555 and NED®; particularly where enhanced photostability is desired. ATTO 550 fluoresces in the yellow region of the visible spectrum and its fluorescence can be effectively quenched by BHQ®-2 dye.

Properties:

  • Formula:

    C43H56N4O7P

  • Molecular Weight:

    771.9

  • Absorption Maximum (Lambda Max):

    554

  • Extinction Coefficient at Lambda max:

    120000

  • Extinction Coefficient at 260 nm:

    28800

  • Fluorescence Maximum:

    576

Product usage:

  • The mass this product adds after conjugation and work-up (the additional mass seen by mass spectrometry) is:

    755.9

Storage and handling: