Dye Labeling Reagents (in stock)


Selection of Cyanine, Fluorescein, Rhodamine, BDP and Pyrene dyes.
Fluorescent dyes containing a large variety of functional groups and different length of PEG spacer for increased water solubility. Enable efficient biolabeling in imaging and diagnostic R&D.


BDP FL dye is a bright and photostable fluorophore compatible with all types of fluorescence measuring instruments for FAM (fluorescein), Alexa Fluor 488, BODIPY FL. This dye is an excellent choice for microscopy and is also useful for fluorescence polarization assays.
BDP Labeling

BDP FL dye is a bright and photostable fluorophore compatible with all types of fluorescence measuring instruments for FAM (fluorescein), Alexa Fluor 488, BODIPY FL. This dye is an excellent choice for microscopy and is also useful for fluorescence polarization assays.

BDP FL acid

BDP FL is a bright and photostable green-fluorescent dye for fluorescein (FAM) channel.


BDP FL NHS ester

BDP FL NHS ester can be used to label free amines (-NH2) of proteins, oligonucleotides, and other amine-containing molecules. The resulting BDP FL conjugates exhibit bright fluorescence, narrow emission bandwidths, and relatively long excited-state lifetimes.


BDP FL azide

BDP FL azide is a BDP FL derivative containing an azide group, which enables Click Chemistry. It is a green-emitting dye compatible with FAM fluorescence measuring instruments.


BDP FL propargyl

BDP FL propargyl is a BDP FL derivative containing a propargyl group, which allows site-specific conjugation by Click Chemistry. This reagent will be ideal for the labeling of antibody, protein or probe conjugation.


BDP FL DBCO

BDP FL DBCO is a BDP FL derivative containg a DBCO group, which will enable strain promoted alkyne azide cycloaddition (spAAC) without the copper catalyst. This reagent can be an ideal alternative for copper intolerant situations.


BDP FL maleimide

BDP FL maleimide is a BDP FL dye derivative containing a maleimide group, which selectively reacts with free thiol, sulfhydryl, or mercapto group via Michael addition to form a stable carbon sulfur bond. This reagent is a bright and photostable thiol-reactive dye and can thus be used for protein labeling.



Cyanine dyes are popular fluorescent dyes compatible with various detection techniques and standard filters. We provide a wide selection of Cyanine dyes such as Cy3, Cy3.5, Cy5, Cy5.5, Cy7, Cy7.5, etc.
Cyanine Labeling

Cyanine dyes are popular fluorescent dyes compatible with various detection techniques and standard filters. We provide a wide selection of Cyanine dyes such as Cy3, Cy3.5, Cy5, Cy5.5, Cy7, Cy7.5, etc.

Cyanine-PEG-acid

Cyanine-PEG-acid is a PEG derivative containing cyanine dyes and a free terminal carboxyl acid. Terminal carboxylic acid can react with primary amine groups in the presence of of activators (e.g. EDC, or DCC) to form a stable amide bond. The hydophilic PEG spacer increases solubility in aqueous media and membrane impermeability.


Cyanine-PEG-alkyne

Cyanine-PEG-alkyne is a PEG derivative containing cyanine dye and an alkyne group, which enables copper-catalyzed Click Chemistry. The hydophilic PEG spacer increases solubility in aqueous media and membrane impermeability.


Cyanine-PEG-amine

Cyanine-PEG-amine is a PEG derivative containing cyanine dye and a free amine group, which will be reactive with cabroxylic acid, activated NHS ester, carbonyl (ketone, aldehyde) etc. The hydophilic PEG spacer increases solubility in aqueous media and membrane impermeability.


Cyanine-PEG-azide

Cyanine-PEG-azide is a PEG derivative containing cyanine dye as well as an azide group, which enables Click Chemistry. The hydophilic PEG spacer increases solubility in aqueous media and membrane impermeability.


Cyanine-PEG-biotin

Cyanine-PEG-biotin is a PEG derivative containing cyanine dye as well as biotin, which enables efficient protein enrichment. The hydophilic PEG spacer increases solubility in aqueous media and membrane impermeability.


Cyanine-PEG-DBCO

Cyanine-PEG-DBCO is a cyanine labeled PEG derivative containinig DBCO group, which reacts with azide functionalized compounds or biomolecules to form a stable triazole linkage without copper catalyst. DBCO-activated fluorescein dye will be an ideal alternative to copper intolerant applications and the hydophilic PEG spacer arm increases solubility in aqueous media and membrane impermeability.


Cyanine-hydroxyl-PEG

Cyanine-hydroxyl-PEG is a cyanine labeled PEG derivative containing hydroxyl group, which enables further derivatized or replaced with other reactive functional groups. Hydophilic PEG spacer increases solubility in aqueous media and reduces steric hindrance during binding.


Cyanine-PEG-Maleimide

Cyanine-PEG-Maleimide is a cyanine labeled PEG derivative containing a maleimide group, which can selectively and efficiently react with thiols to form a covalent bond, enabling the connection of thiol-bearing biomolecules. Hydophilic PEG spacer increases solubility in aqueous media and membrane impermeability.


Cyanine-PEG-NHS ester

Cyanine-PEG-NHS ester is a cyanine labeled PEG derivative containing a NHS ester group, which is an amine reactive group. Hydophilic PEG spacer increases solubility in aqueous media and membrane impermeability. This reagent can be utilized to produce Cyanine-labeled biomolecules for subsequent use such as in vivo research, and drug design related experiments.


Cyanine Alkyne

Cyanine Alkyne is cyanine derivative containing alkyne group, which enables Click Chemistry to attach deeply colored and photostable Cyanine fluorophore to various molecules.


Cyanine Acid

Cyanine Acid is non-activated carboxylic acid and this dye has limited water solubility. It can be dissolved in mixtures of water with organic phase such as DMF, DMSO or alcohols to obtain reliable concentrations. This dye can be considered as non-reactive dye for sample controls and for instrument calibration.


Cyanine Amine

Cyanine amine is a cyanine dye derivative containing an amine group, which is reactive with cabroxylic acid, activated NHS ester, carbonyl (ketone, aldehyde) etc.


Cyanine Azide

Cyanine azide is a reactive cyanine dye containing azide group, which enables Click Chemistry. This bright and photostable dye is suitable for many different methods of fluorescence detection and can be easily detected in small quantities (nM) by naked human eye.


Cyanine DBCO

Cyanine DBCO is a cyanine dye derivative containing a DBCO group, which enables copper-free Click Chemistry. DBCO will react with azide-bearing compounds or biomolecules to form a stable triazole linkage without copper catalyst.


Cyanine Hydrazide

Cyanine hydrazide is a reactive dye containing hydrazide, which can be used to label aldehydes and ketones. This dye can react smoothly and nearly quantitatively with various carbonyl groups contained in biomolecules.


Cyanine Maleimide

Cyanine Maleimide is cyanine dye derivative containinig maleimide group, which is a thiol reactive group. Maleimide group enables attaching Cyanine fluorophore to proteins and peptides containing cysteine residues as well as to other thiolated molecules (such as thiol-containing oligonucleotides). Labeling with Cyanine maleimide is selective, and efficient.


Cyanine NHS ester

Cyanine NHS ester is a reactive cyanine dye containing NHS group, which enables labeling of amino-bearing biomolecules.


Cyanine TCO

Cyanine TCO is a cyanine dye containing a TCO moiety, which can ligate with tetrazines and methyltetrazines with the fastest bioconjugation speed.


Cyanine Tetrazine

Cyanine Tetrazine is a cyanine dye containing a Tetrazine moiety, which can ligate with TCOs with the fastest bioconjugation speed. It is an inverse electron demand [4+2] cycloaddition that takes place between tetrazine and trans-cyclooctene or other strained olefin.



Fluorescein (FAM) is a xanthene universal dye for various applications, compatible with most of existing instruments. It can be used as quantum yield standard and is replaceable with Alexa Fluor 488, DyLight 488.
Fluorescein labeling

Fluorescein (FAM) is a xanthene universal dye for various applications, compatible with most of existing instruments. It can be used as quantum yield standard and is replaceable with Alexa Fluor 488, DyLight 488.

Fluorescein Acid

Fluorescein acid is a xanthene dye and can be used as quantum yield standard. Fluorescent derivatives can thus be used to label or tag biomolecules and nanoparticles with fluorescein dye.


Fluorescein Alkyne

Fluorescein Alkynes is a fluorescein dye derivative containing an alkyne group, which enables copper-catalyzed Click chemistry.


Fluorescein Amine

Fluorescein amine is a fluorescein dye containing a free amine group, which can be reactive with cabroxylic acid, activated NHS ester, carbonyl (ketone, aldehyde) etc.


Fluorescein Azide

Fluorescein Azide is a green emitting fluorescent dye derivitative containing an azide group, which enables Click Chemistry.


Fluorescein DBCO

Fluorescein DBCO is a fluorescein dye derivative containing a DBCO group, which can react with azide-bearing compounds or biomolecules to form a stable triazole linkage without copper catalyst. This reagent can be an alternative for copper intolerant situations.


Fluorescein NHS ester

Fluorescein NHS ester is a fluorescein dye containing an amine-reactive NHS group and can be used as a labeling reagent for antibodies and other purified proteins at primary amines (lysine side chains).



Pyrene is a polyaromatic hydrocarbon with strong short-wavelength fluorescence. It is sensitive to microenvironment and its fluorescence is different in polar and nonpolar environments. Two pyrenes can form excimers, which can be easily observed and quantitatively estimated using fluorescent spectra.
Pyrene Labeling

Pyrene is a polyaromatic hydrocarbon with strong short-wavelength fluorescence. It is sensitive to microenvironment and its fluorescence is different in polar and nonpolar environments. Two pyrenes can form excimers, which can be easily observed and quantitatively estimated using fluorescent spectra.

Pyrene-PEG-acid

Pyrene-PEG-acid is a pyrene labeled PEG derivative for the surface functionalization of carbon nanotube and graphene, graphene oxide, reduced graphene oxide. A strong pi-pi stacking is formed between the pyrene and the aromatic rings on single wall and multi-walled carbon nanotubes.


Pyrene-PEG-azide

Pyrene-PEG-azide is a pyrene labeled PEG derivative containing an azide group, which enables Click Chemistry labeling with any alkyne-bearing molecules and thus turns any molecule into pyrene-bearing probe.


Pyrene-PEG-alcohol

Pyrene-PEG-alcohol is a pyrene labeled PEG derivative containing an hydroxyl group, which enables further derivatized or replaced with other reactive functional groups.


Pyrene-PEG-propargyl

Pyrene-PEG-propargyl is a pyrene labeled PEG derivative containing an propargyl group, which enables Click Chemistry labeling. This reagent will be ideal for antibody, protein or probe conjugation.



Rhodamines are supplements to fluoresceins, as they offer longer wavelength emission maxima and provide opportunities for multicolor labeling or staining.
Rhodamine labeling

Rhodamines are supplements to fluoresceins, as they offer longer wavelength emission maxima and provide opportunities for multicolor labeling or staining.

Rhodamine Alkyne

Rhodamine Alkynes is a red-emitting rhodamine dye derivative containing an alkyne group, which enables Click Chemistry.


Rhodamine Azide

Rhodamine azides is a red-emitting rhodamine dye derivative containing an azide group, which enables Click Chemistry.


Rhodamine DBCO

Rhodamine DBCO is a red-emitting rhodamine dye derivative containing a DBCO group, which enables copper free Click Chemistry and will react with azide-bearing compounds or biomolecules to form a stable triazole linkage. This reagent will be an ideal alternative to copper intolerant applications.


ROX NHS ester

ROX NHS ester is a rhodamine dye derivative containing NHS ester group, which can be used to label the primary amines (-NH2) of proteins, oligonucleotides, and other amine-containing molecules. ROX (rhodamine X aka R101) is a highly fluorescent and photostable rhodamine dye for various applications and ROX labeled oligonucleotide probes are often used in qPCR, and qPCR instruments possessing ROX channel.


TAMRA Acid

TAMRA Acid has achieved prominence as a dye for oligonucleotide labeling and automated DNA sequencing applications.


TAMRA Biotin

TAMRA Biotin is a TAMRA dye derivative containing biotin, which enables efficient protein enrichment.


TAMRA DBCO

TAMRA DBCO is a TAMRA derivative containing a DBCO group, which enables copper free Click Chemistry. TAMRA has achieved prominence as a dye for oligonucleotide labeling and automated DNA sequencing applications. DBCO will react with azide functionalized compounds or biomolecules without catalyst to form a stable triazole linkage, which is an ideal alternative to copper intolerant applications.