Is Alexa Fluor 594 better than Texas Red?

Comparison Between Alexa Fluor 594 and Texas Red


When comparing fluorescent dyes for applications in microscopy, flow cytometry, or other fluorescence-based techniques, two popular choices are Alexa Fluor 594 and Texas Red. Both are used for labeling proteins, nucleic acids, and other molecules in a variety of biological assays. The choice between them depends on several factors including their spectral properties, brightness, photostability, and compatibility with other fluorescent dyes in multiplex assays.

Spectral Properties

Property Alexa Fluor 594 Texas Red
Excitation Wavelength (nm) 590 595
Emission Wavelength (nm) 617 615

Brightness and Photostability

  • Alexa Fluor 594: Known for its high brightness and excellent photostability, making it suitable for applications requiring prolonged illumination and observation.
  • Texas Red: Also bright, but generally considered to be less photostable than Alexa Fluor 594. It may fade more quickly under intense or prolonged illumination.


Both dyes are compatible with a wide range of instruments and can be used in multiplex assays with other fluorescent dyes, assuming their emission spectra do not overlap significantly. However, the specific choice between Alexa Fluor 594 and Texas Red may depend on the other dyes being used and the available filters and detectors in the instrumentation.


Is Alexa Fluor 594 better than Texas Red? The answer depends on the specific requirements of your application. Alexa Fluor 594 tends to be preferred for its higher brightness and greater photostability, making it a more versatile choice for a wide range of applications. However, Texas Red may still be the dye of choice in certain contexts, especially if it fits better within a particular spectral setup or if its slightly different spectral properties offer an advantage.

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