Alexa Fluor™ 350 Antibody Labeling Kit

Catalog number: A20180

Alexa Fluor™ 350 Antibody Labeling Kit

Catalog number: A20180
Catalog Number
also known as A-20180
Unit Size
1 kit
Price (USD)
Catalog NumberUnit SizePrice (USD)AvailabilityQuantity
also known as A-20180
1 kit
Product Overview
Citations & References
Additional Information
Molecular Probes™ Alexa Fluor™ Antibody Labeling Kits provide a convenient means to label small amounts of antibodies with Alexa Fluor™ dyes (choice of 10 colors). This kit is optimized for labeling 100 μg of antibody per reaction with blue fluorescent Alexa Fluor™ 350. Comparably small amounts of other proteins (>40 kDa) can also be labeled.

The kit contains everything you need to perform five separate labeling reactions as well as to purify the resulting conjugates. Conjugates are ideal for multiple applications, including flow cytometry, fluorescent microscopy, immunohistochemistry, primary detection, ELISAs, immunocytochemistry, indirect FISH, and more.

Important Features of Alexa Fluor™ 350 Antibody Labeling Kit:
• With an excitation and emission maximum of 346/442 nm, Alexa Fluor™ 350 can be efficiently excited using a UV laser line and detected under standard DAPI filters
• Labeled proteins typically ready to use typically in 90 min (∼15 min hands-on time)
• Useful for labeling 100 μg of protein
• Optimized for small-scale labeling of any protein >40 kDa
• Purified using convenient spin filters
• Stabilizing proteins must be removed from the sample before labeling
• Includes detailed instructions for determining degree of labeling (DOL)

Better Results and Workflows with Primary labeled antibodies
A primary antibody directly labeled with a fluorophore often produces lower background fluorescence and less nonspecific binding. Further, multiple primary antibodies of the same isotype or derived from the same species can easily be used in the same experiment if they are directly labeled with compatible fluorophores.

Superior Alexa Fluor™ Dyes
Compared to traditional dyes, Alexa Fluor™ dyes are brighter, more photostable, and more pH resistant between pH 4 and 10. And generally when using Alexa Fluor™ dyes, higher degrees of labeling can be achieved without intramolecular quenching. For details see Alexa Fluor™ Dyes Spanning the Visible and Infrared Spectrum—Section 1.3.

Learn More About Protein and Antibody Labeling
We offer a wide selection of Molecular Probes™ antibody and protein labeling kits to fit your starting material and your experimental setup. See Antibody Labeling from A to Z or use our Labeling Chemistry Selection Tool for other choices. To learn more about our various kits read Kits for Labeling Proteins and Nucleic Acids—Section 1.2 in the Molecular Probes™ Handbook.

We'll Make a Custom Antibody Conjugate for You
If you can't find what you're looking for in our stocked list, we'll prepare a custom antibody conjugate for you. Our custom conjugation service is efficient and confidential, and we stand by the quality of our work. We are ISO 13485:2000 certified.

For Research Use Only. Not for use in diagnostic procedures.
For Research Use Only. Not for use in diagnostic procedures.


Product Type
Labeling Kit
Detection Method
346/442 nm
Labeling Method
Labeling Scale
100 μg
Shipping Condition
Room Temperature
Product Line
Alexa Fluor™
Label or Dye
Alexa Fluor 350
Labeling Target
Antibodies, Proteins
Label Type
Alexa Fluor

Contents & Storage

Alexa Fluor™ 350 Antibody Labeling Kit comes with 5 vials of reactive dye, sodium bicarbonate, purification resin, spin columns and collections tubes.
  • Store at 2°C to 8°C, protected from light. Component A may be stored from -20°C to +8°C.
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