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CF® Dye Maleimides

CF® Dye Maleimides are thiol-reactive fluorescent dyes. Maleimides are commonly used to label proteins, peptides or other molecules containing free thiol groups.

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Product Attributes

Chemical reactivity (reacts with)


Functional group


Storage Conditions

Store at -10 to -35 °C, Protect from light

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0.5 umol
0.25 umol
1 umol
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Product Description

CF® Dye Maleimides are thiol-reactive fluorescent dyes. Maleimides are commonly used to label proteins or small ligands like peptides or oligonucleotide thiophosphates on free thiol groups.

  • Thiol-reactive fluorescent dyes.
  • Stably label antibodies, proteins, or small ligands like peptides or oligonucleotide thiophosphates on free thiol groups.
  • Bright, photostable and water-soluble CF® Dyes are excellent options for fluorescent labeling.

Superior CF® Dyes

CF® Dyes are Biotium’s line of next-generation fluorescent dyes that have improved brightness, photostability and water solubility compared to Alexa Fluor®, DyLight®, and other fluorescent dyes.

Learn more about CF® Dyes. For more information download the CF® Dye Brochure.

CF® Dye Maleimide

ConjugationEx/EmSizeCatalog No.Dye Features
CF®350347/448 nm1 umol92020CF®350 Features
CF®405S404/431 nm1 umol92030CF®405S Features
CF®405M408/452 nm1 umol92021CF®405M Features
CF®405L395/545 nm1 umol92046CF®405L Features
CF®430426/498 nm1 umol92118CF®430 Features
CF®440440/515 nm1 umol92124CF®440 Features
CF®450450/538 nm1 umol96012CF®450 Features
CF®488A490/515 nm1 umol92022CF®488A Features
CF®503R503/532 nm1 umol96079CF®503R Features
CF®532527/558 nm1 umol92045CF®532 Features
CF®543541/560 nm1 umol92044CF®543 Features
CF®550R551/577 nm1 umol96074CF®550R Features
CF®555555/565 nm1 umol92023CF®555 Features
CF®568562/583 nm1 umol92024CF®568 Features
CF®570568/591 nm1 umol96015CF®570 Features
CF®583583/606 nm1 umol96017CF®583 Features
CF®594593/614 nm1 umol92025CF®594 Features
CF®620R617/639 nm1 umol92033CF®620R Features
CF®633630/650 nm1 umol92026CF®633 Features
CF®640R642/662 nm1 umol92034CF®640R Features
CF®647650/665 nm1 umol92027CF®647 Features
CF®660R663/682 nm1 umol92031CF®660R Features
CF®660C667/685 nm1 umol92028CF®660C Features
CF®680681/698 nm1 umol92029CF®680 Features
CF®680R680/701 nm1 umol92032CF®680R Features
CF®750755/777 nm1 umol96062CF®750 Features
CF®800797/816 nm0.25 umol92128CF®800 Features
CF®820822/835 nm0.25 umol96069CF®820 Features


1. J Gen Physiol (2014) 143 (1): 105–118. DOI: 10.1085/jgp.201311053
2. J Biol Chem (2015) 290: 17956-17966. DOI: 10.1074/jbc.M115.641688
3. Nature Methods (2015) 12:773–779. DOI: 10.1038/nmeth.3475
4. Biophys J (2018) 115:996-1006. DOI: 10.1016/j.bpj.2018.07.037

Download a list of CF® Dye references.


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