Shop All Fluorescent Dyes

Vivid™ Red Fluorescent Standard

Vivid® Fluorescent Standards represent the products formed during oxidation of Vivid® Substrates by cytochrome P450 enzymes. These standards enable quantification of enzyme activity when used as part of the Vivid® CYP450 Screening Kits. Vivid® Fluorescent Standards are included in the Vivid® Screening Kits, but may also be purchased separately. They are supplied as a dried film.

More About Vivid® CYP450 Screening Kits
Vivid® CYP450 Screening Kits are high-throughput fluorescence-based assays for detection of enzyme-drug interactions and CYP450 inhibition. Vivid® CYP450 Screening Kits include Vivid® Substrate, Vivid® Fluorescent Standard, reaction buffer, Vivid® Regeneration System, NADP+, and CYP450 BACULOSOMES® Plus Reagent. Vivid® Fluorogenic Substrates are blocked dyes that yield minimal fluorescence signal until cleaved or hydroxylated. Oxidation at either of two potential sites releases the highly fluorescent product. CYP450 BACULOSOMES® Plus Reagents are microsomes prepared from insect cells expressing a human CYP450 isozyme and human cytochrome P450 reductase. CYP450 BACULOSOMES® Plus Reagents offer a distinct advantage over human liver microsomes in that only one CYP450 isozyme is expressed, thereby preventing metabolism by other CYP450s.

>> View all Vivid® CYP450 Screening Kits

Applications: high-throughput screening of enzyme-drug interactions, compound profiling for drug inhibition of cytochrome P450 isozymes, generation of predictive SAR models to guide compound acquisition For Research Use Only. Not for any animal or human therapeutic or diagnostic use.

Vivid™ Green Fluorescent Standard

Vivid® Fluorescent Standards represent the products formed during oxidation of Vivid® Substrates by cytochrome P450 enzymes. These standards enable quantification of enzyme activity when used as part of the Vivid® CYP450 Screening Kits. Vivid® Fluorescent Standards are included in the Vivid® Screening Kits, but may also be purchased separately. They are supplied as a dried film.

More About Vivid® CYP450 Screening Kits
Vivid® CYP450 Screening Kits are high-throughput fluorescence-based assays for detection of enzyme-drug interactions and CYP450 inhibition. Vivid® CYP450 Screening Kits include Vivid® Substrate, Vivid® Fluorescent Standard, reaction buffer, Vivid® Regeneration System, NADP+, and CYP450 BACULOSOMES® Plus Reagent. Vivid® Fluorogenic Substrates are blocked dyes that yield minimal fluorescence signal until cleaved or hydroxylated. Oxidation at either of two potential sites releases the highly fluorescent product. CYP450 BACULOSOMES® Plus Reagents are microsomes prepared from insect cells expressing a human CYP450 isozyme and human cytochrome P450 reductase. CYP450 BACULOSOMES® Plus Reagents offer a distinct advantage over human liver microsomes in that only one CYP450 isozyme is expressed, thereby preventing metabolism by other CYP450s.

>> View all Vivid® CYP450 Screening Kits

Applications: high-throughput screening of enzyme-drug interactions, compound profiling for drug inhibition of cytochrome P450 isozymes, generation of predictive SAR models to guide compound acquisition For Research Use Only. Not for any animal or human therapeutic or diagnostic use.

Alexa Fluor™ 633 Carboxylic Acid, tris(triethylammonium) salt (Invitrogen™)

Alexa Fluor® 633 Carboxylic Acid is a non-reactive form of Alexa Fluor® 633 that can be used as a reference standard for dye-conjugates. Additionally, this carboxylic acid derivative can be converted to an amine-reactive ester using standard chemical techniques or coupled to hydrazines, hydroxylamines, and amines in aqueous solution using water-soluble carbodiimides such as EDAC (Cat. No. E2247).

Characteristics of Alexa Fluor® 633 dye include:

• Laser line: 633 or 635 nm
• Excitation maxima: 632 nm
• Emission maxima: 647 nm

More About Alexa Fluor® 633 Dye
The Alexa Fluor 633 dye and its conjugates are a perfect match to the 633 nm spectra line of the He-Ne laser or the 635 nm spectral line of red diode lasers. This and other far-red fluorescent Alexa Fluor® dyes are important labels for fluorescence imaging because their spectra are beyond the range of most sample autofluorescence.

Discover the Benefits of the Alexa Fluor® Dye Series
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 in the Molecular Probes Handbook.

Reference Dye Sampler Kit - Five 1 mM Solution, 1 mL each (Invitrogen™)

The Reference Dye Sampler Kit provides samples of five extensively characterized fluorescence standards (quinine sulfate, fluorescein, carboxy-tetramethylrhodamine, sulforhodamine 101, nile blue) packaged as 1 mM solutions with emission spectra covering the entire visible wavelength range.

Alexa Fluor™ 532 Carboxylic Acid, triethylammonium salt (Invitrogen™)

Alexa Fluor® 532 Carboxylic Acid is a non-reactive form of Alexa Fluor® 532 that can be used as a reference standard for dye-conjugates. Additionally, this carboxylic acid derivative can be converted to an amine-reactive ester using standard chemical techniques or coupled to hydrazines, hydroxylamines, and amines in aqueous solution using water-soluble carbodiimides such as EDAC (Cat. No. E2247).

Characteristics of Alexa Fluor® 532 dye include:

• Laser line: 532 nm
• Excitation maxima: 530 nm
• Emission maxima: 554 nm

More About Alexa Fluor® 532 Dye
The Alexa Fluor® 532 dye and its conjugates have excitation and emission spectra that are intermediate between those of the green-fluorescent Alexa Fluor 488 dye and the orange-fluorescent Alexa Fluor 546 dye, making it an ideal dye for use with 532 excitation sources, including the frequency-doubled Nd-Yag laser.

Discover the Benefits of the Alexa Fluor® Dye Series
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 in the Molecular Probes Handbook.

Vivid™ Blue Fluorescent Standard

Vivid® Fluorescent Standards represent the products formed during oxidation of Vivid® Substrates by cytochrome P450 enzymes. These standards enable quantification of enzyme activity when used as part of the Vivid® CYP450 Screening Kits. Vivid® Fluorescent Standards are included in the Vivid® Screening Kits, but may also be purchased separately. They are supplied as a dried film.

More About Vivid® CYP450 Screening Kits
Vivid® CYP450 Screening Kits are high-throughput fluorescence-based assays for detection of enzyme-drug interactions and CYP450 inhibition. Vivid® CYP450 Screening Kits include Vivid® Substrate, Vivid® Fluorescent Standard, reaction buffer, Vivid® Regeneration System, NADP+, and CYP450 BACULOSOMES® Plus Reagent. Vivid® Fluorogenic Substrates are blocked dyes that yield minimal fluorescence signal until cleaved or hydroxylated. Oxidation at either of two potential sites releases the highly fluorescent product. CYP450 BACULOSOMES® Plus Reagents are microsomes prepared from insect cells expressing a human CYP450 isozyme and human cytochrome P450 reductase. CYP450 BACULOSOMES® Plus Reagents offer a distinct advantage over human liver microsomes in that only one CYP450 isozyme is expressed, thereby preventing metabolism by other CYP450s.

>> View all Vivid® CYP450 Screening Kits

Applications: high-throughput screening of enzyme-drug interactions, compound profiling for drug inhibition of cytochrome P450 isozymes, generation of predictive SAR models to guide compound acquisition For Research Use Only. Not for any animal or human therapeutic or diagnostic use.

Alexa Fluor™ 647 Carboxylic Acid, tris(triethylammonium) salt (Invitrogen™)

Alexa Fluor® 647 Carboxylic Acid is a non-reactive form of Alexa Fluor® 647 that can be used as a reference standard for dye-conjugates. Additionally, this carboxylic acid derivative can be converted to an amine-reactive ester using standard chemical techniques or coupled to hydrazines, hydroxylamines, and amines in aqueous solution using water-soluble carbodiimides such as EDAC (Cat. No. E2247).

Characteristics of Alexa Fluor® 647 dye include:

• Laser line: 647 nm
• Common filter set: Cy® 5
• Excitation maxima: 650 nm
• Emission maxima: 665 nm

More About Alexa Fluor® 647 Dye
Alexa Fluor® 647 dye is a bright, far-red-fluorescent dye with excitation ideally suited for the 594 nm or 633 nm laser lines. It is ideal for imaging low-abundance targets, especially in fixed cells. Alexa Fluor® 647 dye is commonly used with DAPI, and Alexa Fluor® 488 and 594 dyes for multiplexing. Learn more about this dye and related products.

Discover the Benefits of the Alexa Fluor® Dye Series
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 in the Molecular Probes Handbook.

Alexa Fluor™ 546 Carboxylic Acid, tris(triethylammonium) salt (Invitrogen™)

Alexa Fluor® 546 Carboxylic Acid is a non-reactive form of Alexa Fluor® 546 that can be used as a reference standard for dye-conjugates. Additionally, this carboxylic acid derivative can be converted to an amine-reactive ester using standard chemical techniques or coupled to hydrazines, hydroxylamines, and amines in aqueous solution using water-soluble carbodiimides such as EDAC (Cat. No. E2247).

Characteristics of Alexa Fluor® 546 dye include:

• Laser line: 546 nm
• Common filter set: TRITC (tetramethylrhodamine)
• Excitation maxima: 556 nm
• Emission maxima: 573 nm

More About Alexa Fluor® 546 Dye
Alexa Fluor® 546 dye is a bright, yellow-fluorescent dye that can be excited using the 488 nm or 532 nm laser lines. Alexa Fuor® 546 serves as an alternative for tetramethylrhodamine or Cy®3 dye, with higher initial intensity than Alexa Fluor® 555 dye, but lower photostability in buffer or antifade. Learn more about this dye and related products.

Discover the Benefits of the Alexa Fluor® Dye Series
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 in the Molecular Probes Handbook.

Zip Alexa Fluor™ 488 Rapid Antibody Labeling Kit (Invitrogen™)

Zip Alexa Fluor Rapid Antibody Labeling kits allow you to efficiently label your precious antibody with Alexa Flour dyes to create an antibody conjugate that is ready to use within 15 minutes.

• Very fast and easy to use
• 100% antibody recovery—no purification steps
• Useful for a wide range of applications
• No chemistry or conjugation experience needed
• With an excitation and emission maximum of 494/519 nm, Alexa Fluor 488 can be efficiently excited using a 488 nm argon laser line and detected under standard FITC/Cy2 filters

The kit contains everything you need to perform three separate labeling reactions. Conjugates are ideal for multiple applications, including flow cytometry, fluorescent microscopy, immunohistochemistry, primary detection, ELISAs, immunocytochemistry, and indirect FISH.

Better results and workflows with labeled primary 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.

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 experimental setup. See Antibody Labeling from A to Z.

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.

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 9001:2000 certified.

Vivid™ Cyan Fluorescent Standard

Vivid® Fluorescent Standards represent the products formed during oxidation of Vivid® Substrates by cytochrome P450 enzymes. These standards enable quantification of enzyme activity when used as part of the Vivid® CYP450 Screening Kits. Vivid® Fluorescent Standards are included in the Vivid® Screening Kits, but may also be purchased separately. They are supplied as a dried film.

More About Vivid® CYP450 Screening Kits
Vivid® CYP450 Screening Kits are high-throughput fluorescence-based assays for detection of enzyme-drug interactions and CYP450 inhibition. Vivid® CYP450 Screening Kits include Vivid® Substrate, Vivid® Fluorescent Standard, reaction buffer, Vivid® Regeneration System, NADP+, and CYP450 BACULOSOMES® Plus Reagent. Vivid® Fluorogenic Substrates are blocked dyes that yield minimal fluorescence signal until cleaved or hydroxylated. Oxidation at either of two potential sites releases the highly fluorescent product. CYP450 BACULOSOMES® Plus Reagents are microsomes prepared from insect cells expressing a human CYP450 isozyme and human cytochrome P450 reductase. CYP450 BACULOSOMES® Plus Reagents offer a distinct advantage over human liver microsomes in that only one CYP450 isozyme is expressed, thereby preventing metabolism by other CYP450s.

>> View all Vivid® CYP450 Screening Kits

Applications: high-throughput screening of enzyme-drug interactions, compound profiling for drug inhibition of cytochrome P450 isozymes, generation of predictive SAR models to guide compound acquisition For Research Use Only. Not for any animal or human therapeutic or diagnostic use.

Qdot™ 800 ITK™ Organic Quantum Dots (Invitrogen™)

Qdot® 800 ITK™ organic quantum dots are the ideal starting material for applications calling for organic solvents such as hexane, toluene, dichloromethane, or chloroform. These materials are provided as solutions in decane, and are not water soluble. These Qdot® ITK™ organic quantum dots are designed for researchers who want to use their own methods for transferring quantum dot materials into water. Our Qdot® ITK™ organic quantum dots are provided as 1 µM solutions and are available in 7 colors of Qdot® probes.

Important Features of Qdot® ITK™ Organic Quantum Dots:
• Qdot® 800 ITK™ organic quantum dot has emission maxima of ~800 nm
• Extremely photostable and bright fluorescence
• Efficiently excited with single-line excitation sources
• Narrow emission, large stokes shift
• Available in multiple colors
• Ideal for various labeling and tracking applications


Properties of Qdot® Nanocrystals
Qdot® probes are ideal for imaging and labeling applications that require bright fluorescent signals and/or real-time tracking. Unique among fluorescent reagents, all nine available colors of Qdot® probes can be simultaneously excited with a single (UV to blue-green) light source. This property makes these reagents excellent for economical and user-friendly multiplexing applications. Qdot® labels are based on semiconductor nanotechnology and are similar in scale to moderately sized proteins.

About the Innovator’s Tool Kit Qdot® ITK™ Reagents
These Qdot®ITK™ probes are ideal for researchers who wish to prepare specific (non-stocked) conjugates for their applications and need customizable conjugation functionality.

Other Forms of Qdot® Nanocrystals are Available
In addition to the organic form, we offer Qdot® ITK™ quantum dots with carboxyl and amine-derivatized PEG modifications. We’ve also developed a wide range of Qdot® nanocrystals conjugates and labeling kits. Investigate the properties of Qdot® nanocrystals or read the Molecular Probes® Handbook Section 6.6—Qdot® Nanocrystals to find out more.

For Research Use Only. Not intended for any animal or human therapeutic or diagnostic use.

Alexa Fluor™ 750 Carboxylic Acid, tris(triethylammonium) salt (Invitrogen™)

Alexa Fluor® 750 Carboxylic Acid is a non-reactive form of Alexa Fluor® 750 that can be used as a reference standard for dye-conjugates. Additionally, this carboxylic acid derivative can be converted to an amine-reactive ester using standard chemical techniques or coupled to hydrazines, hydroxylamines, and amines in aqueous solution using water-soluble carbodiimides such as EDAC (Cat. No. E2247).

Characteristics of Alexa Fluor® 750 dye include:

• Laser line: 750 nm
• Common filter set: Cy® 7
• Excitation maxima: 749 nm
• Emission maxima: 775 nm

More About Alexa Fluor® 750 Dye
Alexa Fluor® 750 dye and its conjugates exhibit fluorescence spectra that are very similar to those of CY® 7 dye. Its fluorescence emission maximum at 775 nm is well separated from commonly used far-red fluorophores such as Alexa Fluor® 647 or allophycocyanin (APC), facilitating multicolor analysis.

Discover the Benefits of the Alexa Fluor® Dye Series
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 in the Molecular Probes Handbook.

Qdot™ 655 ITK™ Organic Quantum Dots (Invitrogen™)

Qdot® 655 ITK™ organic quantum dots are the ideal starting material for applications calling for organic solvents such as hexane, toluene, dichloromethane, or chloroform. These materials are provided as solutions in decane, and are not water soluble. These Qdot® ITK™ organic quantum dots are designed for researchers who want to use their own methods for transferring quantum dot materials into water. Our Qdot® ITK™ organic quantum dots are provided as 1 µM solutions and are available in 7 colors of Qdot® probes.

Important Features of Qdot® ITK™ Organic Quantum Dots:
• Qdot® 655 ITK™ organic quantum dot has emission maxima of ~655 nm
• Extremely photostable and bright fluorescence
• Efficiently excited with single-line excitation sources
• Narrow emission, large stokes shift
• Available in multiple colors
• Ideal for various labeling and tracking applications


Properties of Qdot® Nanocrystals
Qdot® probes are ideal for imaging and labeling applications that require bright fluorescent signals and/or real-time tracking. Unique among fluorescent reagents, all nine available colors of Qdot® probes can be simultaneously excited with a single (UV to blue-green) light source. This property makes these reagents excellent for economical and user-friendly multiplexing applications. Qdot® labels are based on semiconductor nanotechnology and are similar in scale to moderately sized proteins.

About the Innovator’s Tool Kit Qdot® ITK™ Reagents
These Qdot®ITK™ probes are ideal for researchers who wish to prepare specific (non-stocked) conjugates for their applications and need customizable conjugation functionality.

Other Forms of Qdot® Nanocrystals are Available
In addition to the organic form, we offer Qdot® ITK™ quantum dots with carboxyl and amine-derivatized PEG modifications. We’ve also developed a wide range of Qdot® nanocrystals conjugates and labeling kits. Investigate the properties of Qdot® nanocrystals or read the Molecular Probes® Handbook Section 6.6—Qdot® Nanocrystals to find out more.

For Research Use Only. Not intended for any animal or human therapeutic or diagnostic use.

Alexa Fluor™ 555 Carboxylic Acid, tris(triethylammonium) salt (Invitrogen™)

Alexa Fluor® 555 Carboxylic Acid is a non-reactive form of Alexa Fluor® 555 that can be used as a reference standard for dye-conjugates. Additionally, this carboxylic acid derivative can be converted to an amine-reactive ester using standard chemical techniques or coupled to hydrazines, hydroxylamines, and amines in aqueous solution using water-soluble carbodiimides such as EDAC (Cat. No. E2247).

Characteristics of Alexa Fluor® 555 dye include:

• Laser line: 488 or 532 nm
• Common filter set: TRITC (tetramethylrhodamine)
• Excitation maxima: 555 nm
• Emission maxima: 580 nm

More About Alexa Fluor® 555 Dye
Alexa Fluor® 555 dye is a bright, orange-fluorescent dye that can be excited using the 488 nm or 532 nm laser lines. It is a recommended replacement for Cy®3 dye or tetramethylrhodamine, with greater photostability than Cy®3 dye in live and fixed cells. Alexa Fluor® 555 dye is commonly used with DAPI, and Alexa Fluor® 488 and 647 dyes for multiplexing. Learn more about this dye and related products.

Discover the Benefits of the Alexa Fluor® Dye Series
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 in the Molecular Probes Handbook.

Zip Alexa Fluor™ 555 Rapid Antibody Labeling Kit (Invitrogen™)

Zip Alexa Fluor Rapid Antibody Labeling kits allow you to efficiently label your precious antibody with Alexa Flour dyes to create an antibody conjugate that is ready to use within 15 minutes.

• Very fast and easy to use
• 100% antibody recovery—no purification steps
• Useful for a wide range of applications
• No chemistry or conjugation experience needed
• With an excitation and emission maximum of 555/565 nm, Alexa Fluor 555 can be efficiently excited using a 543 nm He-Ne laser line and detected under standard TRITC/Cy3 filters

The kit contains everything you need to perform three separate labeling reactions. Conjugates are ideal for multiple applications, including flow cytometry, fluorescent microscopy, immunohistochemistry, primary detection, ELISAs, immunocytochemistry, and indirect FISH.

Better results and workflows with labeled primary 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.

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 experimental setup. See Antibody Labeling from A to Z.

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.

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 9001:2000 certified.