MB 633 NHS Ester

Unit Size
Price (USD)
Cat.#: 1771-1
Unit size: 1 mg
in stock
Cat.#: 1771-5
Unit size: 5 mg
in stock
Cat.#: 1771-25
Unit size: 25 mg
in stock
Cat.#: 1771-100
Unit size: 100 mg
in stock

For many years, the cyanine-5 based dye (Cy™5 and more recently Alexa Fluor® 647) has been the dye of choice in far-red spectral window due to minimal autofluorescence in most biological samples in this spectral region allowing for extremely sensitive detection. In spite of recent improvement in cyanine-5 based dyes most dye are still lacks sufficient photostability required for many demanding applications.

MB 633 is a novel, rhodamine-based dye with its absorption peak at 630 nm. MB 633 can be optimally excited by the 633 nm He-Ne laser or the 635 nm red diode laser with emission maximum at 650 nm. The most important advantage of MB 633 and other rhodamine-based far-red MB dyes are their unmatched photostability. The combination of superior brightness and photostability makes far-red MB dyes ideal choices for detection in the long wavelength region on a variety of instruments

Primary amine
Abs/Em Maxima
630/650 nm
Extinction coefficient
100,000 cm-1M-1
Water, DMSO, DMF
Spectrally similar dyes
Alexa Fluor® 633, CF® 633,
Molecular weight
Storage conditions
Shipping conditions
Ambient temperature


Enter only one — either volume or amount of protein to be labeled
Enter only one — either maximum concentration of DMSO or volume DMSO added to label

Alexa Fluor® Dyes is a registered trademark of Thermo Fisher Scientific.