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CF™350 Dye

CF™350 is a blue fluorescent dye spectrally similar to the traditional blue fluorescent dye, AMCA. However, compared to AMCA, CF™350 is more water-soluble, more photostable and at least 50% more fluorescent on proteins. CF™350 is at least as bright as Alexa Fluor® 350 and thus can be a direct replacement for the latter for all applications (Figure 2).

A full selection of reactive dyes, secondary antibodies, antibody labeling kits, and other bioconjugates including phalloidins, Annexin V and α-bungarotoxin are available for CF™ dyes.

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CF™350 conjugates, labeling kits, and reactive dyes

Technical Summary

  • Abs/Em Maxima: 347/448 nm
  • Extinction coefficient: 18,000
  • Molecular weight: 496
  • Flow cytometry laser line: UV
  • Microscopy laser line: UV nm
  • Direct replacement for: Alexa Fluor® 350, AMCA


  • Yields the brightest blue fluorescent antibody conjugates when excited at ~350 nm
  • Highly water-soluble
  • Insensitive to pH
Figure 1. Absorption and emission spectra of CF350 goat anti-mouse conjugate in PBS.
Figure 1. Absorption and emission spectra of CF™350 conjugated to goat anti-mouse IgG in PBS.
Figure 2. Relative fluorescence of CF™350- and Alexa Fluor® 350-goat anti-mouse conjugates as a function of the number of dye molecules per protein (i.e., degree of labeling).
Figure 3. HeLa cells stained with mouse anti-tubulin antibody and CF350 goat anti-mouse IgG (microtubules, cyan).