AAT Bioquest

Biotin and Streptavidin

The biotin-streptavidin complex is one of the most popular tagging systems for the conjugation of biomolecules, such as proteins, lipids, and nucleic acids, as well as that of synthetic molecules, such as fluorescent labels. It has found strong success in the area of sample preparation as a core part of many purification systems and plays a critical role in many detection systems for instruments such as microscopy and flow cytometry.


Biotin-Streptavidin Conjugation System

SA Biotin Diagram
Illustration of the Streptavidin-Biotin interaction. The multivalent properties of streptavidin allow it to bind up to four biotin molecules with a high degree of affinity. Biotin is typically conjugated to an enzyme, antibody, or target protein.
The widespread adoption of the biotin-streptavidin conjugation system is primarily due to two factors. The first is the relatively small size of the biotin and streptavidin molecules themselves, which allows for extensive binding to biologically active macromolecules, such as antibodies, without impedance to their functions (i.e., an antibody's binding site). The second is the specificity with which biotin and streptavidin bind to each other and the strength of the subsequent bond, which allows for powerful, stream-lined bioassay applications. Streptavidin tetramers have an extraordinarily high binding affinity for biotin with a dissociation constant (Kd) of approximately ~10-14 mol/L. This tight and specific binding is rapid and can withstand extremes in pH, temperature, organic solvents, and denaturing reagents.

Advantages of the biotin-streptavidin system

A key benefit of the biotin-streptavidin system is its ability to improve detection sensitivity. This, in large part, is due to the tetrameric conformation of streptavidin. One streptavidin protein can bind four biotin molecules with high affinity and selectivity. This multiplicity enables the amplification of weak signals and improves the detection sensitivity for medium- and low-abundance targets in mammalian cells or tissues with a simple workflow.

Another key benefit is the versatility of the biotin-streptavidin system. Because streptavidin can be conjugated to various reporter tags, it can be readily incorporated into virtually every immunoassay. For example, enzyme conjugates of streptavidin are widely used in enzyme-linked immunosorbent assays (ELISAs), while fluorescently labeled streptavidin, such as iFluor® 488 streptavidin, are widely used in cell surface labeling, fluorescence-activated cell sorting (FACS) and other fluorescence imaging applications.




Biotin is a small 244-dalton hapten molecule. Its high binding affinity for streptavidin is commonly exploited to detect and monitor biological targets of interest. Biotin exhibits two characteristics that make it ideal for bioconjugate development. First, biotin is relatively small in size. This permits labeling multiple biotin tags to a single protein or antibody without significantly impeding its biological reactivity. The second is the valeric acid side chain of the biotin molecule. This chain can be derivatized to facilitate the incorporation of various reactive groups used to conjugate biotin to proteins without altering biotin's binding affinity for streptavidin.

AAT Bioquest offers biotinylated secondary antibodies, proteins, nucleotides, and other small molecules for use in streptavidin-based amplification techniques. For assays in which a biotinylated probe is unavailable, we provide many biotinylation reagents and kits that enable researchers to chemically label proteins, nucleic acids, and surface materials to make custom biotinylated reagents.

Featured Products


Fluorescent Biotin Derivatives

Fluorescent biotin derivatives contain a fluorophore and a biotin moiety in the same molecule. These reagents are used for detecting and quantifying biotin-binding proteins by fluorescence. The strong quenching associated with streptavidin binding to fluorescent biotin can be used to precisely measure the concentration of streptavidin (or avidin).


Table 1. Available Products for Fluorescent Biotin Derivatives

Ex/Em (nm)
Ext. Coeff.¹
Unit Size
Cat No.
Fluorescein biotin497/51680,0000.79005 mg3017
Biotin-4-fluorescein *CAS 1032732-74-3*492/51880,0000.79005 mg3006
Cy5 biotin conjugate650/669250,0000.275 mg3100
  1. Ext. Coeff. = molar extinction coefficient at their maximum absorption wavelength (Units = cm-1M-1).
  2. FQY = fluorescence quantum yield in aqueous buffer (pH 7.2).


Biotinylated Secondary Antibodies

Biotinylated GAR Tubulin Stain
Immunofluorescent stain of U+03b1-tubulin in HeLa cells. U+03b1-tubulin in fixed and permeabilized HeLa cells were labeled with rabbit anti-tubulin primary antibody, followed by incubation with biotinylated goat anti-rabbit IgG (H&L) (Cat No. 16794), and then visualized with iFluor® 555-streptavidin conjugate (Cat No. 16989).
We offer biotinylated secondary antibodies to use with streptavidin-based amplification techniques. A key advantage to using a biotinylated secondary is the flexibility to use the same secondary antibody across multiple applications by using a different streptavidin conjugate.

Readily available streptavidin conjugates

Table 2. Available Products for Biotinylated Secondary Antibodies

Species Reactivity
Unit Size
Cat No.
Biotinylated goat anti-mouse IgG (H+L)Goat/IgGMouse1 mg16729
Biotinylated goat anti-rabbit IgG (H+L)Goat/IgGRabbit1 mg16794


Biotinylated Nucleotides

Biotin-modified nucleoside triphosphate analogs, such as dUTP and dCTP, can be enzymatically incorporated into DNA or RNA fragments for use in fluorescence in situ hybridization (FISH), DNA arrays, microarrays, and other hybridization techniques. Standard enzymatic non-radioactive DNA labeling reactions include 3''-end labeling, cDNA labeling, nick translation, PCR, and random prime labeling. Each biotinylated nucleotide contains either an 11-, 14-, 16- or 20-atom spacer between the biotin and its attachment point on the nucleotide. This facilitates its detection and signal amplification by fluorophore and enzyme streptavidin conjugates or agarose and magnetic beads.


Table 3. Available Biotinylated Nucleotides

Linker Length
Unit Size
Cat No.
Biotin-11-dUTP11 carbons25 nmoles17016
Biotin-16-dUTP16 carbons25 nmoles17017
Biotin-20-dUTP20 carbons25 nmoles17018
Biotin-14-dCTP14 carbons25 nmoles17019
Biotin-11-dATP11 carbons25 nmoles17014
Biotin-11-dGTP11 carbons25 nmoles17015


Biotinylated Amino Acids

Biotinylated peptides are suitable for immunodetection studies and biomedical screening assays that require immobilization onto streptavidin or avidin coated microtitre plates, beads, or membranes. Biotin can be linked to the N-terminus of peptides or the side chains of lysine (Lys), glutamic acid (Glu), or aspartic acid (Asp) during Fmoc solid phase synthesis. Incorporating a PEG-spacer in both FMOC-Glu(biotinyl-PEG)-OH and FMOC-Asp(biotinyl-PEG)-OH reduces steric hindrance between target peptide and streptavidin, leading to better biotin binding. The hydrophilic nature of the PEG-spacer minimizes non-specific interactions and improves the solubility of the reagent and biotinylated peptide.


Table 4. Available Biotinylated Amino Acids

Labeling Principle
Unit Size
Cat No.
FMOC-Lys(Biotin)-OH Uses FMOC-SPPS to prepare biotin-labeled peptidesLysine100 mg5020
FMOC-Glu(biotinyl-PEG)-OH Uses FMOC-SPPS to prepare biotin-labeled peptidesGlutamic acid100 mg5026
FMOC-Glu(biotinyl-PEG)-OH Uses FMOC-SPPS to prepare biotin-labeled peptidesGlutamic acid1 g5027
FMOC-Asp(biotinyl-PEG)-OH Uses FMOC-SPPS to prepare biotin-labeled peptidesAspartic acid100 mg5023
FMOC-Asp(biotinyl-PEG)-OH Uses FMOC-SPPS to prepare biotin-labeled peptidesAspartic acid1 g5024


Reactive-Biotin Derivatives

Reactive biotin derivatives contain reactive moieties, such as succinimidyl esters or maleimides, that facilitate labeling biotin onto proteins, antibodies, and other macromolecules. When selecting a reactive biotin derivative, consider the following:
  • Funtional group targeting - specific reactive moieties target and bind to their respective functional groups for targeted or non-selective biotinylation of proteins and other macromolecules (e.g., succinimidyl esters target primary amines and maleimides target thiol or sulfhydryl groups).
  • Solubility - this influences biotinylation of the target protein or macromolecule.
  • Spacer Arm Length (PEG) - enhance detection sensitivity of the target protein and reduces steric hindrance.

ReadiView™ Biotinylation Reagents

ReadiView Biotin Succinimidyl Ester
ReadiView™ biotin succinimidyl ester (Cat No. 3059) conjugated with specially designed color tag (CT) for easy determination of biotinylation.
Determining a protein's degree of biotinylation is quite challenging because the intrinsic absorption of biotin is difficult to discern from proteins and nucleic acids. To facilitate this determination, we offer a series of chromophoric reactive biotin derivatives, ReadiView™ biotin.

These novel biotinylation reagents contain a specially designed 'Color Tag (CT)' optimally positioned between two spacer arms. These spacer arms reduce steric hindrance and improve water solubility, while the CT tag makes the degree of biotinylation readily quantifiable by calculating the absorption ratio of 280 nm/385 nm. The CT tag does not affect biotins complexation with streptavidin and has a minimal quenching effect on fluorescent streptavidin conjugates. ReadiView™ biotin is available in amine-reactive, thiol-reactive, and click-chemistry formats.


Table 5. Available Reactive Biotinylation Reagents

Chemical Reactivity
Reactive Moiety
Unit Size
Cat No.
Biotin, succinimidyl ester *CAS 35013-72-0*AmineSuccinimidyl Ester100 mg3002
Biotin-X, succinimidyl ester *CAS 72040-63-2*AmineSuccinimidyl Ester25 mg3010
Biotin PEG2 succinimidyl esterAmineSuccinimidyl Ester25 mg3016
Biotin PEG4 succinimidyl esterAmineSuccinimidyl Ester25 mg3022
Biotin C2 maleimideThiolMaleimide25 mg3005
Biotin PEG2 maleimide *CAS 305372-39-8*ThiolMaleimide5 mg3015
Biotin PEG2 amine *CAS 138529-46-1*Aldehyde, Carboxylic Acid, KetoneAmine5 mg3014
Biotin PEG3 amineAldehyde, Carboxylic Acid, KetoneAmine5 mg3024
Biotin cadaverineAldehyde, Carboxylic Acid, KetoneCadaverine5 mg3004
Biotin ethylenediamine *CAS 216299-38-6*Aldehyde, Carboxylic Acid, KetoneEthylenediamine 5 mg3003
Biotin hydrazide *CAS 66640-86-6*Aldehyde, Carboxylic Acid, KetoneHydrazide5 mg3007
Biotin AzideAlkyneAzide5 mg3020
Biotin-PEG3-azide *CAS 945633-30-7*AlkyneAzide5 mg3019
Biotin Alkyne *CAS 1006592-45-5*AzideAlkyne5 mg3021

Table 6. Available ReadiView™ Biotin Products

Chemical Reactivity
Unit Size
Cat No.
ReadiView™ biotin succinimidyl esterAminesPegylated5 mg3059
ReadiView™ biotin maleimideThiol or sulfhydryl groupsPegylated5 mg3058
ReadiView™ biotin hydrazideAldehyde, Carboxylic acid, KetonePegylated5 mg3055
ReadiView™ biotin amineCarbonylPegylated5 mg3053
ReadiView™ biotin acidAminePegylated5 mg3050


Enzyme-Labeled Streptavidin Conjugates

Stayright Purple Stain
IHC detection of EpCAM in FFPE lung adenocarcinoma tissue. Human adenocarcinoma tissue sections were incubated with rabbit anti-EpCAM primary antibody followed by biotinylated goat anti-rabbit IgG (H&L). The samples were then incubated with HRP-streptavidin, and the signal was developed using ReadiUse™ Stayright™ Purple.
Enzyme-labeled streptavidin conjugates are commonly used in enzyme-linked immunosorbent assay (ELISA), immunohistochemistry, immunoblotting, and in situ hybridization techniques. Enzymes horseradish peroxidase (HRP) and alkaline phosphatase (ALP) are extensively used as reporter tags because of their high turnover rate, stability, ease of conjugation, and low cost.

To maximize retention of both enzyme and protein activity, our HRP-streptavidin and AP-streptavidin conjugates are prepared at a 1:1 (enzyme to streptavidin) labeling ratio. Chromogenic, fluorogenic, and chemiluminescent substrates are available for these enzyme conjugates.

Learn More

Table 7. Available Enzyme-labeled Streptavidin Conjugates

Unit Size
Cat No.
HRP-streptavidin conjugateHorseradish peroxidase (HRP)1 mg16920
AP-streptavidin conjugateAlkaline phosphatase (AP)1 mg16921

Table 8. Available HRP Substrates

Abs/Ex (nm)
Ex (nm)
Unit Size
Cat No.
ReadiUse™ ABTSChromogenic420 1 L11001
ReadiUse™ TMBChromogenic650 100 mL11012
ReadiUse™ TMBChromogenic650 1 L11003
Amplite® ADHPFluorogenic57158425 mg11000
Amplite® BlueFluorogenic32440925 mg11005
Amplite® RedFluorogenic5715841000 Assays11011
Amplite® IRFluorogenic6486681 mg11009
LuminolChemiluminescent3554121 g11050

Table 9. AP-Streptavidin Conjugate & Substrates

Abs/Ex (nm)
Ex (nm)
Unit Size
Cat No.
pNPP *CAS 4264-83-9*Chromogenic405 25 mg11619
FDP *CAS 217305-49-2*Fluorogenic4985175 mg11600
MUP, disodium salt *CAS 22919-26-2*Fluorogenic36044825 mg11610
MUP, disodium salt *CAS 22919-26-2*Fluorogenic36044810 g11612
DiFMUPFluorogenic3584505 mg11627
SunRed™ PhosphateFluorogenic6536615 mg11629
D-Luciferin phosphate *CAS 145643-12-3Chemiluminescent  5 mg12512


Fluorescent Streptavidin Conjugates

SA iF647 Stain
Immunofluorescent stain of &alpha-tubulin in HeLa cells. &alpha-tubulin in fixed and permeabilized HeLa cells were incubated with rabbit anti-tubulin primary antibody, followed by incubation with biotinylated goat anti-rabbit IgG (H&L) (Cat No. 16794), and then visualized with iFluor® 647-streptavidin conjugate (Cat No. 16966. Nuclei were counterstained using DAPI (Cat No. 17507.)
Fluorescent streptavidin conjugates are widely used in fluorescence imaging to detect biotinylated antibodies, ligands and DNA probes for in situ hybridization techniques, immunohistochemistry and multicolor flow cytometry. We offer a comprehensive portfolio of fluorescent streptavidin labeled with iFluor® dyes, mFluor™ dyes, phycobiliproteins, tandem dyes, and more. Benefits of our iFluor® streptavidin conjugates include exceptionally bright fluorescence, excellent photostability, and pH insensitive fluorescence over a wide molar range.

iFluor® Streptavidin Conjugates

Streptavidin conjugates labeled with iFluor® dyes exhibit exceptionally bright and photostable fluorescence, outperforming Alexa Fluor® and other spectrally similar conjugates. iFluor® streptavidin conjugates are designed for various cell analysis and protein analysis applications, including imaging, flow cytometry, and fluorescent western blotting. As a precaution, avoid using blue fluorescent streptavidin conjugates when detecting low abundance targets. Blue fluorescent dyes have lower fluorescence and can experience a higher non-specific background than other dyes.

Learn More


Table 10. iFluor-Streptavidin Conjugates For Imaging and Flow Cytometry

Ex/Em (nm)
Filter Set
Ext. Coeff.¹
Unit Size
Cat No.
iFluor® 350 Streptavidin 344/448DAPI20,0000.951 mg16980
iFluor® 405 Streptavidin402/425DAPI37,0000.911 mg16982
iFluor® 488 Streptavidin491/516FITC75,0000.91 mg16985
iFluor® 514 Streptavidin527/554TRITC80,0000.831 mg16986
iFluor® 532 Streptavidin543/563TRITC90,0000.681 mg16987
iFluor® 546 Streptavidin541/557TRITC100,0000.67200 µg16958
iFluor® 555 Streptavidin556/569TRITC100,0000.641 mg16989
iFluor® 568 Streptavidin568/587TRITC100,0000.57200 µg16960
iFluor® 594 Streptavidin587/603Texas Red180,0000.531 mg16992
iFluor® 633 Streptavidin638/652Texas Red250,0000.291 mg16995
iFluor® 647 Streptavidin654/669Cy5250,0000.251 mg16996
iFluor® 680 Streptavidin683/700Cy5.5220,0000.231 mg16997
iFluor® 700 Streptavidin690/713Cy5.5220,0000.231 mg16998
iFluor® 750 Streptavidin756/777Cy7275,0000121 mg16999
iFluor® 790 Streptavidin786/811Cy7250,0000.13200 µg16975
iFluor® 800 Streptavidin801/820Cy7250,0000.11200 µg16976
iFluor® 820 Streptavidin820/849Cy7250,000N/D³200 µg16977
iFluor® 840 Streptavidin836/876Cy7200,000N/D³200 µg16978
iFluor® 860 Streptavidin852/877Cy7250,000N/D³200 µg16979
  1. Ext. Coeff. = Extinction coefficient at their maximum absorption wavelength. The units of extinction coefficient are cm-1M-1.
  2. FQY = fluorescence quantum yield in aqueous buffer (pH 7.2).
  3. N/D = Not determined.


mFluor™ Streptavidin Conjugates for Flow Cytometry

mFluor™ Blue 570 Strepatidin stain
Flow cytometry analysis of HL-60 cells stained with (Red) or without (Green) 1ug/ml Anti-Human HLA-ABC-Biotin and then followed by mFluor™ Blue 570-streptavidin conjugate (Cat No.16935).
Streptavidin conjugates labeled with mFluor™ dyes exhibit minimal self-quenching, producing intensely fluorescent and photostable conjugates for flow cytometry. mFluor™ streptavidin conjugates are designed for optimal excitation by one of the major laser lines commonly equipped in flow cytometers, such as the 405 nm, 488 nm, 532 nm, 561 nm, or 633 nm laser lines.

Learn More

Table 11. mFluor™ Streptavidin Conjugates for Flow Cytometry


Streptavidin APC, PE, PerCP and Tandem Dye Conjugates for Flow Cytometry

Streptavidin PE, APC, and PerCP conjugates are commonly used in applications that require high sensitivity but not photostability, primarily flow cytometry, FACS, immunophenotyping, and microarrays. The unusually bright fluorescence of phycobiliproteins is due to their unusually high extinction coefficients and quantum yields.

Tandem dye conjugates compromise of a donor phycobiliprotein (e.g., APC or PE) labeled to acceptor iFluor® dyes that emit fluorescence at a longer wavelength. Using fluorescence resonance energy transfer (FRET), light absorbed by the donor phycobiliprotein results in fluorescence emission of the acceptor. In flow cytometry, tandem dyes are ideally suited for multicolor parametric analysis of cells due to their exploitation of a single excitation source and their significantly large Stokes shifts.

Table 12. Streptavidin APC, PE, PerCP and Tandem Dye Conjugates for Flow Cytometry

Streptavidin Conjugates
Ex (nm)
Em (nm)
Filter Set
Cat No.
RPE Streptavidin564574575/2616900
APC Streptavidin651660660/2016902
PerCP Streptavidin477678695/4016905
RPE-iFluor® 647 Streptavidin568666670/1416906
RPE-iFluor® 750 Streptavidin566778780/6016907
APC-iFluor® 750 Streptavidin651791780/6016908
RPE-Cy7 Streptavidin566778780/6016916


Streptavidin-Xtra™ Conjugates

Streptavidin comparison stain
Comparison of HeLa cells stained with Streptavidin-Xtra™ IF488 and Streptavidin-Alexa Fluor® 488. HeLa cells were fixed with 4% paraformaldehyde for 30 minutes, permeabilized with 0.02% Triton™ X-100 for 10 minutes, blocked with 1% BSA for 1 hour and labeled with 1 µg/mL U+03b1-tubulin Mouse mAb for 1 hour at room temperature. Biotinylated goat anti-mouse IgG (H+L) (Cat No. 16729) was used for detection of U+03b1-tubulin and visualized with Streptavidin-Xtra™ iFluor 488 (Cat No. 46001) and Streptavidin-Alexa Fluor® 488. Cells were counterstained with Hoechst 33342 (Cat No. 17535).
The optimal degree of labeling of Streptavidin-Xtra™ iFluor® conjugates produce the brightest fluorescent streptavidin conjugates for the detection of biotinylated antibodies in cell imaging, flow cytometry, and western blot applications. Streptavidin-Xtra™ iFluor® conjugates image low-abundance targets with greater sensitivity and detail than traditional streptavidin Alexa Fluor® conjugates.


  • Bright and photostable fluorescence without significant self-quenching
  • High signal-to-noise ratios: 3~5 fold signal improvement versus Alexa Fluor®
  • pH insensitive fluorescence over a wide molar range

Table 13. Streptavidin-Xtra™ Conjugates

Streptavidin Conjugates
Ex (nm)
Em (nm)
Filter Set
Cat No.
Streptavidin-Xtra™ iFluor® 488491516FITC46001
Streptavidin-Xtra™ iFluor® 555556569TRITC46003
Streptavidin-Xtra™ iFluor® 594587603Texas Red46005
Streptavidin-Xtra™ iFluor® 647654669Cy546007


Product Ordering Information


Table 14. Ordering Info for Biotin Products

Product Name
Unit Size
3001Biotin *CAS 58-85-5*1 g
3002Biotin, succinimidyl ester *CAS 35013-72-0*100 mg
3003Biotin ethylenediamine *CAS 216299-38-6*10 mg
3004Biotin cadaverine25 mg
3005Biotin C2 maleimide25 mg
3006Biotin-4-fluorescein *CAS 1032732-74-3*5 mg492518
3007Biotin hydrazide *CAS 66640-86-6*25 mg
3009Biotin-X NTA [Biotin-X nitrilotriacetic acid, potassium salt] *CAS 856661-92-2*1 mg
3010Biotin-X, succinimidyl ester *CAS 72040-63-2*25 mg
3014Biotin PEG2 amine *CAS 138529-46-1*5 mg
3015Biotin PEG2 maleimide *CAS 305372-39-8*5 mg
3016Biotin PEG2 succinimidyl ester25 mg
3017Fluorescein biotin5 mg492515
3019Biotin-PEG3-azide *CAS 945633-30-7*5 mg
3020Biotin Azide5 mg
3021Biotin Alkyne *CAS 1006592-45-5*5 mg
3022Biotin PEG4 succinimidyl ester25 mg
3050ReadiView™ biotin acid25 mg
3053ReadiView™ biotin amine5 mg
3055ReadiView™ biotin hydrazide5 mg
3058ReadiView™ biotin maleimide5 mg
3059ReadiView™ biotin succinimidyl ester5 mg
3110AF532 PEG4 biotin conjugate1 mg534553
5520ReadiLink™ Protein Biotinylation Kit2 Labelings
5521ReadiLink™ Protein Biotinylation Kit *Powered by ReadiView™ Biotin Visionization Technology*1 kit
5522Amplite® Colorimetric Biotin Quantitation Kit200 Tests500
16729Biotinylated goat anti-mouse IgG (H+L)1 mg
16794Biotinylated goat anti-rabbit IgG (H+L)1 mg
17016Biotin-11-dUTP *1 mM in Tris Buffer (pH 7.5)* *CAS 86303-25-5*25 nmoles
17017Biotin-16-dUTP *1 mM in Tris Buffer (pH 7.5)* *CAS 136632-31-0*25 nmoles
17018Biotin-20-dUTP *1 mM in Tris Buffer (pH 7.5)*25 nmoles
20605Cal-520®-Biotin Conjugate5x50 ug492514
17105Biotin-cAMP conjugate100 ug
6220Biotin-dT Phosphoramidite50 umoles
3008Biotin NTA5 mg
3018Biotin PEG 4 Alkyne5 mg
45352Biotin-PEG4-tyramide200 Slides
6222Biotin Phosphoramidite100 umoles
12630Biotin-X IDA1 mg
26050Acridinium Biotin Conjugate1 mg
17100N6-Methyladenosine-Biotin conjugate1 mg
3013Biotin PEG4 amine5 mg
39050Psoralen-PEG3-Biotin1 mg
39052ReadiLink™ Psoralen-A17-Biotin1 mg
17110Bio-16-UTP [Biotin-16-UTP] *10 mM*25 nmoles

Table 15. Ordering Info for Streptavidin Products

Product Name
Unit Size
16885Streptavidin1 mg
16900RPE-streptavidin conjµgate100 µg
16901RPE-streptavidin conjµgate1 mg
16902APC-streptavidin conjµgate100 µg
16905PerCP-streptavidin conjµgate100 µg
16906RPE-iFluor® 647-streptavidin conjµgate100 µg
16907RPE-iFluor® 750-streptavidin conjµgate100 µg
16908APC-iFluor® 750-streptavidin conjµgate100 µg
16910FITC-streptavidin conjµgate1 mg
16911Texas Red®-streptavidin conjµgate1 mg
16912Cy3®-streptavidin conjµgate1 mg
16913Cy5®-streptavidin conjµgate1 mg
16914Cy7®-streptavidin conjµgate1 mg
16918RPE-Cy5-streptavidin conjµgate100 µg
16920HRP-streptavidin conjµgate1 mg
16921AP-streptavidin conjµgate [Streptavidin-alkaline phosphatase conjµgate]1 mg
16925trFluor™ Eu-streptavidin conjµgate100 µg
16926trFluor™ Tb-streptavidin conjµgate100 µg
16930mFluor™ Violet 450-streptavidin conjµgate100 µg
16931mFluor™ Violet 510-streptavidin conjµgate100 µg
16932mFluor™ Violet 540-streptavidin conjµgate100 µg
16935mFluor™ Blue 570-streptavidin conjµgate100 µg
16938mFluor™ Green 620-streptavidin conjµgate100 µg
16942mFluor™ Yellow 630-streptavidin conjµgate100 µg
16946mFluor™ Red 700-streptavidin conjµgate100 µg
16948mFluor™ Red 780-streptavidin conjµgate100 µg
16950iFluor® 350-streptavidin conjµgate200 µg
16952iFluor® 405-streptavidin conjµgate200 µg
16955iFluor® 488-streptavidin conjµgate200 µg
16956iFluor® 514-streptavidin conjµgate200 µg
16957iFluor® 532-streptavidin conjµgate200 µg
16958iFluor® 546-streptavidin conjµgate200 µg
16959iFluor® 555-streptavidin conjµgate200 µg
16960iFluor® 568-streptavidin conjµgate200 µg
16962iFluor® 594-streptavidin conjµgate200 µg
16965iFluor® 633-streptavidin conjµgate200 µg
16966iFluor® 647-streptavidin conjµgate200 µg
16968iFluor® 680-streptavidin conjµgate200 µg
16970iFluor® 700-streptavidin conjµgate200 µg
16973iFluor® 750-streptavidin conjµgate200 µg
16980iFluor® 350-streptavidin conjµgate1 mg
16982iFluor® 405-streptavidin conjµgate1 mg
16985iFluor® 488-streptavidin conjµgate1 mg
16986iFluor® 514-streptavidin conjµgate1 mg
16987iFluor® 532-streptavidin conjµgate1 mg
16989iFluor® 555-streptavidin conjµgate1 mg
16992iFluor® 594-streptavidin conjµgate1 mg
16995iFluor® 633-streptavidin conjµgate1 mg
16996iFluor® 647-streptavidin conjµgate1 mg
16997iFluor® 680-streptavidin conjµgate1 mg
16998iFluor® 700-streptavidin conjµgate1 mg
16999iFluor® 750-streptavidin conjµgate1 mg