Streptavidin, Alexa Fluor™ 546 conjugate

Catalog number: S11225
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Streptavidin, Alexa Fluor™ 546 conjugate

Catalog number: S11225
Have Questions?
Catalog Number
Unit Size
1 mg
Price (USD)
Catalog NumberUnit SizePrice (USD)AvailabilityQuantity
S112251 mg
Product Overview
Citations & References
Additional Information
Alexa Fluor™ 546 streptavidin comprises a biotin-binding protein (streptavidin) covalently attached to a fluorescent label (Alexa Fluor™ dye). Streptavidin has a very high binding affinity for biotin, and a conjugate of streptavidin is commonly used together with a conjugate of biotin for specific detection of a variety of proteins, protein motifs, nucleic acids, and other molecules (for example, a biotinylated primary antibody bound to a protein target can be detected with a fluorescently labeled streptavidin). Strategies similar to this are used in many detection protocols including western blots, flow cytometry, imaging and microscopy, and microplate assays. Alexa Fluor™ dye streptavidin conjugates are supplied as 1 mg lyophilized product or in 0.5 mL volumes of a 2 mg/mL solution.

Important Features of Alexa Fluor™ 546 Streptavidin Conjugates:
Alexa Fluor™ 546 streptavidin conjugate has Ex/Em maxima of ∼ (556/573)
Bright, photostable fluorescence
High solubility in aqueous solutions
Available in multiple colors
Ideal for western blots, flow cytometry, imaging and microscopy, microplate assays and more

Properties of Alexa Fluor™ Dyes
Alexa Fluor™ dyes are organic fluorescent dyes developed for better performance in imaging and other labeling protocols and exhibit improved photostability and brightness and improved solubility in aqueous solutions. Available in a broad range of colors, these dyes are a good choice for most imaging applications.

Blocking Endogenous Biotin
Naturally occurring biotins can interfere with biotin-streptavidin detection schemes. For experiments involving fixed and permeabilized cells, try our Endogenous Biotin-Blocking Kit to minimize this interference.

For Research Use Only. Not intended for any animal or human therapeutic or diagnostic use.

Related Links:

Learn more about Avidin-Biotin Detection

Learn more about Alexa Fluor™ Dyes

Find out about other Labeled Streptavidin Conjugates

Read Avidin and Streptavidin Conjugates-Section 7.6 in the Molecular Probes Handbook
For Research Use Only. Not for use in diagnostic procedures.


Alexa Fluor 546
Shipping Condition
Room Temperature
Product Line
Alexa Fluor™
Product Type
Streptavidin Conjugate (fluorescent)
Label or Dye
Alexa Fluor Dyes

Contents & Storage

Store in freezer (-5 to -30°C) and protect from light.


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