Shop All Streptavidin-Biotin Binding Products

Streptavidin, Alexa Fluor™ 635 conjugate Invitrogen™

Far-red fluorescent Alexa Fluor 635 streptavidin has absorption/emission maxima of ~633/647 nm. Streptavidin is a nonglycosylated biotin-binding protein that is isolated from bacteria and has a near-neutral isoelectric point. It is widely used to detect biotinylated probes, because it reportedly exhibits less nonspecific binding than does the glycosylated, biotin-binding protein, avidin.

View a selection guide for all Alexa Fluor® streptavidin and avidin conjugates.

Pierce™ Biotin Thermo Scientific™

Biotin, also known as vitamin H, is a small molecule (MW 244.3) that is present in tiny amounts in all living cells and is critical for a number of biological processes. The valeric acid side chain of the biotin molecule can be derivatized in order to incorporate various reactive groups that are used to attach biotin to other molecules. In the context of immunohistochemistry (IHC), biotin is conjugated to antibodies or to the enzyme reporters used to detect target antigens.

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Pierce™ Bovine Serum Albumin, Biotinylated
Pierce™ Horseradish Peroxidase, Biotinylated
Pierce™ Alkaline Phosphatase, Biotinylated
Pierce™ Biotin-Fluorescein Conjugate

eBioscience™ Streptavidin PE Conjugate Invitrogen™

The streptavidin fluorochrome conjugates are commonly used in indirect staining protocols to detect biotinylated primary antibodies in flow cytometry. Streptavidin binds to biotin with high affinity.

Laser
Blue Laser, Green Laser, Yellow-Green Laser

Emit
578 nm

Excite
488 - 561 nm

Reported Application
Flow Cytometric Analysis

Qdot™ 800 Streptavidin Conjugate Invitrogen™

Qdot® 800 streptavidin conjugate comprises a biotin-binding protein (streptavidin) covalently attached to a fluorescent label (Qdot® nanocrystal). Streptavidin has a very high binding affinity for biotin, and a conjugate of streptavidin is commonly used together with a conjugate of biotin for specific detection of a variety of proteins, protein motifs, nucleic acids, and other molecules (for example, a biotinylated primary antibody bound to a protein target can be detected with a fluorescently labeled streptavidin). Strategies similar to this are used in many detection protocols including western blots, flow cytometry, imaging and microscopy, and microplate assays, and are also used in purification workflows to achieve targeted fractionation. Qdot® nanocrystal conjugates are provided as 1 µM solutions.

Important Features of Qdot® Streptavidin Conjugates:
Streptavidin Qdot® 800 conjugate has emission maxima of ~800 nm
Approximately 5 to 10 streptavidins per Qdot® nanocrystal
Extremely photostable and bright fluorescence
Efficiently excited with single-line excitation sources
Narrow emission, large Stokes shift
Available in multiple colors
Ideal for western blots, flow cytometry, imaging and microscopy, microplate assays and more

Properties of Qdot® Nanocrystals
The Qdot® streptavidin conjugate is the size of a large macromolecule or protein (~15–20 nm) and represents the brightest class of streptavidin detection reagents. Qdot® streptavidin conjugates are made from a nanometer-scale crystal of a semiconductor material (CdSe), which is coated with an additional semiconductor shell (ZnS) to improve the optical properties of the material. The Qdot® 705 and Qdot® 800 streptavidin conjugates, which include CdSeTe, are made in a similar fashion. This core-shell material is further coated with a polymer shell that allows the materials to be conjugated to biological molecules and to retain their optical properties.

Other Fluorescent Conjugates of Streptavidin are Available
We offer several other Qdot® colors or try the Qdot® Streptavidin Sampler Kit, containing Qdot® streptavidin conjugates in six colors 525, 565, 585, 605, 655, and 705. In addition to nanocrystal conjugates, we offer a wide range of streptavidins conjugated to Alexa Fluor® dyes, Oregon Green® dye, enzyme conjugates, and traditional fluorophores like Texas Red® dye, fluorescein (FITC) and more.

Find Biotinylated Conjugates
We offer an extensive line of biotinylated conjugates for use in biotin-streptavidin detection strategies.
• Use the primary antibody search tool to find biotinylated primary antibodies
• Use the secondary antibody selector tool to find biotinylated secondary antibodies and biotinylated anti-dye and anti-hapten antibodies

Blocking Endogenous Biotin
Naturally occurring biotins can interfere with biotin-streptavidin detection schemes. For experiments involving fixed and permeabilized cells, try our Endogenous Biotin-Blocking Kit to minimize this interference.

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

Related Links:

Learn more about Avidin-Biotin Detection

To learn more about Qdot® Nanocrystals

Streptavidin, Pacific Orange™ conjugate Invitrogen™

Pacific Orange™ streptavidin has absorption/emission maxima of ~400/551 nm. Streptavidin is a nonglycosylated biotin-binding protein that is isolated from bacteria and has a near-neutral isoelectric point. It is widely used to detect biotinylated probes, because it reportedly exhibits less nonspecific binding than does the glycosylated, biotin-binding protein, avidin.

View a selection guide for all Alexa Fluor® streptavidin and avidin conjugates.

eBioscience™ Streptavidin eFluor™ 710 Conjugate Invitrogen™

The streptavidin fluorochrome conjugates are commonly used in indirect staining protocols to detect biotinylated primary antibodies in flow cytometry. Streptavidin binds to biotin with high affinity.

Laser
Red Laser

Emit
710 nm

Excite
633 - 647 nm

Reported Application
Flow Cytometric Analysis

Streptavidin Protein Thermo Scientific™

Thermo Scientific Pierce Streptavidin is a purified unconjugated recombinant protein form.

Features of Streptavidin:

Recombinant streptavidin—high-quality protein, 53kDa, pI = 6.8 to 7.5
Pure protein —choose pure, unconjugated protein for biotin blocking and controls

The purified recombinant Streptavidin enables detection of biotinylated antibodies and other probes in a variety of standard assay methods, including Western blotting, ELISA, immunohistochemistry and fluorescence imaging. Purified streptavidin is supplied as lyophilized in phosphate-based buffers for immediate reconstitution with water.

Streptavidin is biotin-binding protein that was originally isolated from Streptomyces avidinii. In contrast to avidin, streptavidin has no carbohydrate and has a mildly acidic pI of 5. Thermo Scientific Pierce Streptavidin products use a recombinant form of streptavidin having a mass of 53,000 daltons and a near-neutral pI. Streptavidin is a tetrameric protein, with each subunit binding one molecule of biotin with affinity similar to that of avidin. Guanidinium chloride will dissociate avidin and streptavidin into subunits, but streptavidin is more resistant to dissociation.

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Pierce™ Streptavidin, Horseradish Peroxidase Conjugated
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eBioscience™ Streptavidin Super Bright 780 Conjugate Invitrogen™

eBioscience Streptavidin Super Bright 780 is a streptavidin-fluorochrome conjugate for indirect staining protocols to detect biotinylated primary antibodies in flow cytometry. Super Bright dyes are polymer-based fluorophores that are excited by the violet laser (405 nm) and emit fluorescence at the wavelength indicated in their name. They are optimized for use in flow cytometry and allow for use of additional channels with violet excitation. Super Bright dyes are fully compatible with other commonly used fluorescent molecules, eBioscience buffers and fixatives, viability stains, and reagents.

Super Bright 780 is a tandem dye that can be excited with the violet laser line (405 nm) and emits at 780 nm. We recommend using a 780/60 bandpass filter or equivalent. Please make sure that your instrument is capable of detecting this fluorochrome.

Applications tested
Streptavidin Super Bright 780 Conjugate has been tested by flow cytometric analysis to detect biotinylated primary antibodies. The amount of this conjugate that will stain a cell sample in a final volume of 100 μL is less than or equal to 0.125 μg. Cell number should be determined empirically but can range from 105 to 108 cells/test. It is recommended that the streptavidin be carefully titrated for optimal performance in the assay of interest.

Samples can be stored in IC Fixation Buffer or 1-step Fix/Lyse Solution for up to three days in the dark at 4°C with minimal impact on brightness and FRET efficiency/compensation. Clone specific performance after fixation should be determined empirically.

When using two or more Super Bright dye-conjugated antibodies in a staining panel, it is recommended to use Super Bright Complete Staining Buffer to minimize any non-specific polymer interactions. Please refer to the datasheet for Super Bright Complete Staining Buffer for more information.

In some experiments, we have observed that compensation values for Super Bright 780-conjugated antibodies are higher in the violet 450/50 channel when using UltraComp eBeads microspheres as compared to single-color stained cells. In such circumstances, we would recommend setting compensation with cells. We have also observed this in some experiments using AbC Total Antibody Compensation beads.

Super Bright polymer dyes are sold under license from Becton, Dickinson and Company.

Qdot™ 565 Streptavidin Conjugate Invitrogen™

Qdot® 565 streptavidin conjugate comprises a biotin-binding protein (streptavidin) covalently attached to a fluorescent label (Qdot® nanocrystal). Streptavidin has a very high binding affinity for biotin, and a conjugate of streptavidin is commonly used together with a conjugate of biotin for specific detection of a variety of proteins, protein motifs, nucleic acids, and other molecules (for example, a biotinylated primary antibody bound to a protein target can be detected with a fluorescently labeled streptavidin). Strategies similar to this are used in many detection protocols including western blots, flow cytometry, imaging and microscopy, and microplate assays, and are also used in purification workflows to achieve targeted fractionation. Qdot® nanocrystal conjugates are provided as 1 µM solutions.

Important Features of Qdot® Streptavidin Conjugates:
Streptavidin Qdot® 565 conjugate has emission maxima of ~565 nm
Approximately 5 to 10 streptavidins per Qdot® nanocrystal
Extremely photostable and bright fluorescence
Efficiently excited with single-line excitation sources
Narrow emission, large Stokes shift
Available in multiple colors
Ideal for western blots, flow cytometry, imaging and microscopy, microplate assays and more

Properties of Qdot® Nanocrystals
The Qdot® streptavidin conjugate is the size of a large macromolecule or protein (~15–20 nm) and represents the brightest class of streptavidin detection reagents. Qdot® streptavidin conjugates are made from a nanometer-scale crystal of a semiconductor material (CdSe), which is coated with an additional semiconductor shell (ZnS) to improve the optical properties of the material. The Qdot® 705 and Qdot® 800 streptavidin conjugates, which include CdSeTe, are made in a similar fashion. This core-shell material is further coated with a polymer shell that allows the materials to be conjugated to biological molecules and to retain their optical properties.

Other Fluorescent Conjugates of Streptavidin are Available
We offer several other Qdot® colors or try the Qdot® Streptavidin Sampler Kit, containing Qdot® streptavidin conjugates in six colors 525, 565, 585, 605, 655, and 705. In addition to nanocrystal conjugates, we offer a wide range of streptavidins conjugated to Alexa Fluor® dyes, Oregon Green® dye, enzyme conjugates, and traditional fluorophores like Texas Red® dye, fluorescein (FITC) and more.

Find Biotinylated Conjugates
We offer an extensive line of biotinylated conjugates for use in biotin-streptavidin detection strategies.
• Use the primary antibody search tool to find biotinylated primary antibodies
• Use the secondary antibody selector tool to find biotinylated secondary antibodies and biotinylated anti-dye and anti-hapten antibodies

Blocking Endogenous Biotin
Naturally occurring biotins can interfere with biotin-streptavidin detection schemes. For experiments involving fixed and permeabilized cells, try our Endogenous Biotin-Blocking Kit to minimize this interference.

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

Related Links:

Learn more about Avidin-Biotin Detection

To learn more about Qdot® Nanocrystals

Dynabeads™ MyOne™ Streptavidin T1 Invitrogen™

Dynabeads MyOne Streptavidin T1 are the gold standard for isolation and handling of biotinylated nucleic acids, antibodies, or other biotinylated ligands and targets. The very high binding affinity of the streptavidin-biotin interaction (Kd=10-15) is used in a vast number of applications. Benefits and features:

• Direct and fast isolation of any biotinylated molecule
• Flexible protocols with gentle and efficient liquid-phase reaction kinetics
• Low-charged and neutral beads, optimal for binding of proteins, peptides, and antibodies
• Their small but uniform size presents a high surface area per mg beads and a correspondingly high capacity for the target molecule
• Low sedimentation rate, yet a high iron content, ensuring rapid magnetic separation
• Biomagnetic protocols are easily adapted to automated platforms
• High batch-to-batch reproducibility, securing consistent results in your application

About Dynabeads MyOne Streptavidin T1
These uniform and superparamagnetic beads are 1 µm in diameter, with a monolayer, not a multilayer, of recombinant streptavidin covalently coupled to the surface and further blocked with BSA. The monolayer of streptavidin leaves the vast majority of the biotin binding sites sterically available for binding, not only of free biotin, but also for binding of biotinylated ligands/targets. The beads show rapid liquid-phase reaction kinetics. Their specific and defined surface allow for efficient capture, separation, and downstream handling. The streptavidin monolayer ensures negligible leakage, and the lack of excess adsorbed streptavidin ensures batch consistency and reproducibility of your results. The 1 µm Dynabeads MyOne have a large surface area, high capacity, efficient magnetic pull, and a slow sedimentation rate during incubation. Tailor-made for use in automated protocols where high throughput is crucial.

Applications
Over the past 15 years, streptavidin-coupled Dynabeads have been used and cited for a very wide variety of applications. Key applications include preparing single-stranded DNA templates, isolation of RNA and DNA binding proteins, immobilization of large DNA fragments, purifying sequencing products, and the specific capture of nucleic acids. Easily adapted to automated processes. Dynabeads are used on more than 25,000 routine IVD instruments worldwide.

Binding capacity
The size of the molecule and the biotinylation procedure will affect the binding capacity. The capacity also depends on steric availability and charge interaction between bead and molecule and between molecules. There are two or three biotin binding sites available for each streptavidin molecule on the surface of the bead after immobilization. One mg of Dynabeads MyOne Streptavidin T1 typically binds:

• 950–1500 pmoles free biotin
• ~20 µg biotinylated IgG
• ~400 pmol biotinylated peptides
• ~20 µg ds-DNA
• ~400 pmol ss-oligonucleotides

Streptavidin - AP Invitrogen™

Reactivity: AP-SA reacts with biotin.

Applications: Immunohistochemistry, Western blotting, and ELISA

eBioscience™ Streptavidin Super Bright 600 Conjugate Invitrogen™

eBioscience Streptavidin Super Bright 600 is a streptavidin-fluorochrome conjugate for indirect staining protocols to detect biotinylated primary antibodies in flow cytometry. Super Bright dyes are polymer-based fluorophores that are excited by the violet laser (405 nm) and emit fluorescence at the wavelength indicated in their name. They are optimized for use in flow cytometry and allow for use of additional channels with violet excitation. Super Bright dyes are fully compatible with other commonly used fluorescent molecules, eBioscience buffers and fixatives, viability stains, and reagents.

Super Bright 600 is a tandem dye that can be excited with the violet laser line (405 nm) and emits at 600 nm. We recommend using a 610/20 bandpass filter or equivalent. Please make sure that your instrument is capable of detecting this fluorochrome.

Applications tested
Streptavidin Super Bright 600 Conjugate has been tested by flow cytometric analysis to detect biotinylated primary antibodies. The amount of this conjugate that will stain a cell sample in a final volume of 100 μL is less than or equal to 0.125 μg. Cell number should be determined empirically but can range from 105 to 108 cells/test. It is recommended that the streptavidin be carefully titrated for optimal performance in the assay of interest.

Samples can be stored in Fixation Buffer or 1-step Fix/Lyse Solution for up to three days in the dark at 4°C with minimal impact on brightness and FRET efficiency/compensation. Clone specific performance after fixation should be determined empirically.

When using two or more Super Bright dye-conjugated antibodies in a staining panel, it is recommended to use Super Bright Complete Staining Buffer to minimize any non-specific polymer interactions. Please refer to the datasheet for Super Bright Complete Staining Buffer for more information.

Super Bright polymer dyes are sold under license from Becton, Dickinson and Company.

D-Biotin Invitrogen™

D-biotin binds with high affinity to streptavidin, avidin and NeutrAvidin® biotin-binding proteins.

Streptavidin, Alexa Fluor™ 594 conjugate Invitrogen™

Alexa Fluor® 594 streptavidin comprises a biotin-binding protein (streptavidin) covalently attached to a fluorescent label (Alexa Fluor® dye). Streptavidin has a very high binding affinity for biotin, and a conjugate of streptavidin is commonly used together with a conjugate of biotin for specific detection of a variety of proteins, protein motifs, nucleic acids, and other molecules (for example, a biotinylated primary antibody bound to a protein target can be detected with a fluorescently labeled streptavidin). Strategies similar to this are used in many detection protocols including western blots, flow cytometry, imaging and microscopy, and microplate assays. Alexa Fluor® dye streptavidin conjugates are supplied as 1 mg lyophilized product or in 0.5 mL volumes of a 2 mg/mL solution.

Important Features of Alexa Fluor® 594 Streptavidin Conjugates:
Alexa Fluor® 594 streptavidin conjugate has Ex/Em maxima of ~ (590/617)
Bright, photostable fluorescence
High solubility in aqueous solutions
Available in multiple colors
Ideal for western blots, flow cytometry, imaging and microscopy, microplate assays and more

Properties of Alexa Fluor® Dyes
Alexa Fluor® dyes are organic fluorescent dyes developed for better performance in imaging and other labeling protocols and exhibit improved photostability and brightness and improved solubility in aqueous solutions. Available in a broad range of colors, these dyes are a good choice for most imaging applications.

Blocking Endogenous Biotin
Naturally occurring biotins can interfere with biotin-streptavidin detection schemes. For experiments involving fixed and permeabilized cells, try our Endogenous Biotin-Blocking Kit to minimize this interference.

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

Related Links:

Learn more about Avidin-Biotin Detection

Learn more about Alexa Fluor® Dyes

Find out about other Labeled Streptavidin Conjugates

Read Avidin and Streptavidin Conjugates-Section 7.6 in the Molecular Probes Handbook

Streptavidin Protein, Rhodamine Invitrogen™

Streptavidin for Western Blot, IHC, ELISA
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