Streptavidin and Avidin are proteins that bind to biotin with high affinity. BioLegend provides a wide array of streptavidin conjugated to fluorophores or enzyme, allowing them to be utilized as a secondary labeling method to detect biotinylated molecules in common research applications such as: 

  • Flow cytometry 
  • Tetramer staining
  • Immunofluorescence microscopy
  • In situ hybridization
  • Immunohistochemistry
  • Microarrays
  • Western blotting

Please note the concentration of our streptavidin conjugates is calculated and provided based on the streptavidin molecule alone and not the entire conjugate.


Streptavidin Conjugate Molecular Weight
Format MW (kD)*
Unconjugated Streptavidin 60
Alexa Fluor® 488 60
Alexa Fluor® 594 60
Alexa Fluor® 647 60
APC 320
APC/Cy7 350
Brilliant Violet™ 421 340
Brilliant Violet™ 510 340
Brilliant Violet™ 570 340
Brilliant Violet™ 605 340
Brilliant Violet™ 650 340
Brilliant Violet™ 711 340
Brilliant Violet™ 785 340
Cy3 60
Cy5 60
Dylight™ 488 60
Dylight™ 594 60
Dylight™ 649 60
PE 360
PE/Cy5 480
PE/Cy7 360
PE/Dazzle™ 594 540
PerCP 120
PerCP/Cy5.5 110
*These molecular weights are based on the averages of the lots produced. To obtain lot-specific molecular weights, contact Technical Service.

See Streptavidin Data...


Biotin mouse IL-10 + Brilliant Violet 421™ Streptavidin

Immortalized mouse bone marrow-derived macrophages, treated with LPS (100 ng/ml for 24 h), were stained with Alexa Fluor® 594 Wheat Germ Agglutinin (red) and biotin anti-mouse IL-10 (clone JES5-16E3), followed by Brilliant Violet 421™ Streptavidin (light blue). Image was acquired on an Olympus FV1000 laser scanning confocal microscope at 60x lens, 2x zoom. Data provided by James Harris, Trinity College, Dublin.

Biotin CD56 + Brilliant Violet 421™ Streptavidin

Human NK cell line NK92 fixed and stained with biotin anti-CD56 (clone HCD56) and Brilliant Violet 421™Streptavidin (blue), phalloidin Alexa Fluor® 568 (red), and anti-perforin FITC (green) imaged on Olympus IX81 spinning disk confocal scope on 100 X objective NA 1.45. The first image is the DIC view (far left). The final image (far right) shows the merged fluorescence of the three stains. Data provided by Emily Mace and Jordan Orange, Children's Hospital of Philadelphia.


Biotin anti-mouse CD272 (BTLA) + PE Streptavidin

C57BL/6 splenocytes stained with biotin anti-mouse CD272 (clone 8F4)(left) or biotin mouse IgG1 isotype control (right), followed by PE Streptavidin and CD3e (clone 145-2C11) APC.

HLA-A2/peptide Tetramer + PE Streptavidin or Brilliant Violet 421™ Streptavidin


Human PBMCs were stained with CD8 PerCP and labeled with NLVPMVATV-loaded human HLA-A2 tetramer bound to PE StreptavidinBrilliant Violet 421™Streptavidin, or Pacific Blue™ Streptavidin. The data shows positive staining with a wide range of tetramer dilutions for PE and BV421™. Data provided by Rick Willis and John Altman, Emory/Yerkes.

View all of BioLegend's Streptavidin product citations in our Publication Library


To view a full listing of Trademarks and Patents Click Here.


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