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Streptavidin Conjugates

A high quality biotin-binding protein conjugated to Biotium’s signature bright and photostable fluorescent CF® dyes, and a selection of other labels.

Product Attributes


Blue, Green, Orange, Red, Far-red, Near-infrared

Detection method/readout

Fluorescence microscopy, Live cell imaging, Flow cytometry, Near-IR imager, In vivo near-IR imaging

Antibody reactivity (target)


Product origin

Streptavidin, recombinant from E. coli

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Catalog #
100 uL
200 uL
1 mL
1 mg
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Product Description

CF® dyes conjugates of Streptavidin are high quality biotin-binding proteins labeled with the superior CF® dyes or a selection of other labels. These conjugates are typically used as secondary reagents to detect biotinylated probes such as primary antibodies for flow cytometry, western blotting, immunofluorescence staining, and other applications.

  • Conjugates with wide choice of CF® dye colors, plus HRP, R-PE, APC, and Alkaline Phosphatase
  • Superior CF® dyes are bright, photostable, and water-soluble
  • Ideal for flow cytometry, western blotting, and immunofluorescence staining

Blue dyes have lower fluorescence and can give higher non-specific background than other dye colors. Conjugates of blue fluorescent dyes like CF®350, CF®405S, and CF®405M are not recommended for detecting low abundance targets.

Superior CF® Dyes

Biotium’s next-generation CF® dyes were designed to be highly water-soluble with advantages in brightness and photostability compared to Alexa Fluor®, DyLight®, and other fluorescent dyes.  Learn more about CF® Dyes.

Streptavidin Conjugates

Product Conjugation Ex/Em Size Catalog number
CF®350 Streptavidin CF®350 347/448 nm 1 mg 29031
CF®405S Streptavidin CF®405S 404/431 nm 1 mg 29032
CF®405M Streptavidin CF®405M 408/452 nm 1 mg 29033
CF®405L Streptavidin CF®405L 395/545 nm 1 mg 29056
CF®430 Streptavidin CF®430 426/498 nm 1 mg 29065
CF®440 Streptavidin CF®440 440/515 nm 1 mg 29066
CF®488A Streptavidin CF®488A 490/515 nm 1 mg 29034
CF®514 Streptavidin CF®514 516/548 nm 1 mg 29081
CF®532 Streptavidin CF®532 527/558 nm 1 mg 29030
CF®543 Streptavidin CF®543 541/560 nm 1 mg 29043
CF®555 Streptavidin CF®555 555/565 nm 1 mg 29038
CF®568 Streptavidin CF®568 562/583 nm 1 mg 29035
CF®583R Streptavidin CF®583R 586/609 nm 1 mg 29086
CF®594 Streptavidin CF®594 593/614 nm 1 mg 29036
CF®633 Streptavidin CF®633 630/650 nm 1 mg 29037
CF®640R Streptavidin CF®640R 642/662 nm 1 mg 29041
CF®647 Streptavidin CF®647 650/665 nm 1 mg 29039
CF®660R Streptavidin CF®660R 663/682 nm 1 mg 29040
CF®680R Streptavidin CF®680R 680/701 nm 1 mg 29072
Alkaline Phosphatase
Streptavidin (1 mg/mL)
N/A 100 uL 29071-100uL
1 mL 29071-1mL
HRP Streptavidin HRP N/A 1 mg 29049
R-PE Streptavidin
(0.5 mg/mL)
R-PE 496, 546, 565/578 nm 200 uL 29044-200uL
1 mL 29044-1mL
APC Streptavidin
(0.5 mg/mL)
APC 650/660 nm 200 uL 29048-200uL
1 mL 29048-1mL
CF is a registered trademark of Biotium, Inc. Alexa Fluor, Texas Red, and DyLight are registered trademarks of Thermo Fisher Scientific.


Download a list of CF® dye references.


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