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iFluor® 445 succinimidyl ester

Flow cytometry analysis of whole blood cells stained with iFluor® 445 anti-human CD4 antibody (Clone: SK3). The fluorescence signal was monitored using an Aurora spectral flow cytometer in the iFluor® 445 specific V8-A channel.
Flow cytometry analysis of whole blood cells stained with iFluor® 445 anti-human CD4 antibody (Clone: SK3). The fluorescence signal was monitored using an Aurora spectral flow cytometer in the iFluor® 445 specific V8-A channel.
Flow cytometry analysis of whole blood cells stained with iFluor® 445 anti-human CD4 antibody (Clone: SK3). The fluorescence signal was monitored using an Aurora spectral flow cytometer in the iFluor® 445 specific V8-A channel.
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Telephone1-800-990-8053
Fax1-800-609-2943
Emailsales@aatbio.com
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Physical properties
Molecular weight968.01
SolventDMSO
Spectral properties
Excitation (nm)446
Emission (nm)558
Storage, safety and handling
H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22
StorageFreeze (< -15 °C); Minimize light exposure
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iFluor® 840 goat anti-mouse IgG (H+L)
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iFluor® 860 goat anti-mouse IgG (H+L)
iFluor® 860 goat anti-mouse IgG (H+L) *Cross Adsorbed*
iFluor® 800 goat anti-rabbit IgG (H+L)
iFluor® 800 goat anti-rabbit IgG (H+L) *Cross Adsorbed*
iFluor® 810 goat anti-rabbit IgG (H+L)
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iFluor® 700-Wheat Germ Agglutinin (WGA) Conjugate
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Show More (233)

OverviewpdfSDSpdfProtocol


Molecular weight
968.01
Excitation (nm)
446
Emission (nm)
558
iFluor® 445 dyes have fluorescence excitation and emission maxima of ~445 nm and ~560 nm, respectively. The spectral characteristic of large Stokes Shift makes them an excellent choice for fluorescence imaging applications with high sensitivity. iFluor® 445 SE is reasonably stable and shows good reactivity and selectivity with protein amino groups. iFluor® 445 SE provides a unique fluorescence color to label monoclonal, polyclonal antibodies or other proteins (>10 kDa) for fluorescence imaging and flow cytometric applications. iFluor® 445 dye conjugates are bright, providing an additional color located between Alexa Fluor® 430 and 488 (ThermoFisher). AAT Bioquest's iFluor® dye family provides the largest collection of fluorescent labeling dyes with different spectral properties. They are optimized for labeling proteins, in particular, antibodies. These dyes are bright, photostable, and have minimal quenching on proteins. They can be well excited by the major laser lines of fluorescence instruments (e.g., 350, 405, 488, 555, 633, and 647 nm).

Example protocol


PREPARATION OF STOCK SOLUTIONS

Unless otherwise noted, all unused stock solutions should be divided into single-use aliquots and stored at -20 °C after preparation. Avoid repeated freeze-thaw cycles

Protein stock solution (Solution A)
  1. Mix 100 µL of a reaction buffer (e.g., 1 M  sodium bicarbonate solution or 1 M phosphate buffer with pH ~8.5 to 9.0) with 900 µL of the target protein solution (e.g., antibody, protein concentration >2 mg/mL if possible) to give 1 mL protein labeling stock solution.

    Note: The pH of the protein solution (Solution A) should be 8.5 ± 0.5. If the pH of the protein solution is lower than 8.0, adjust the pH to the range of 8.0-9.0 using 1 M  sodium bicarbonate solution or 1 M pH 9.0 phosphate buffer.

    Note: The protein should be dissolved in 1X phosphate buffered saline (PBS), pH 7.2-7.4. If the protein is dissolved in Tris or glycine buffer, it must be dialyzed against 1X PBS, pH 7.2-7.4, to remove free amines or ammonium salts (such as ammonium sulfate and ammonium acetate) that are widely used for protein precipitation.

    Note: Impure antibodies or antibodies stabilized with bovine serum albumin (BSA) or gelatin will not be labeled well. The presence of sodium azide or thimerosal might also interfere with the conjugation reaction. Sodium azide or thimerosal can be removed by dialysis or spin column for optimal labeling results.

    Note: The conjugation efficiency is significantly reduced if the protein concentration is less than 2 mg/mL. The final protein concentration range of 2-10 mg/mL is recommended for optimal labeling efficiency.

iFluor® 445 SE stock solution (Solution B)
  1. Add anhydrous DMSO into the vial of iFluor® 445 SE to make a 10 mM stock solution. Mix well by pipetting or vortex.

    Note: Prepare the dye stock solution (Solution B) before starting the conjugation. Use promptly. Extended storage of the dye stock solution may reduce the dye activity. Solution B can be stored in the freezer for two weeks when kept from light and moisture. Avoid freeze-thaw cycles.

SAMPLE EXPERIMENTAL PROTOCOL

This labeling protocol was developed for the conjugate of Goat anti-mouse IgG with iFluor® 445 SE. You might need further optimization for your particular proteins.

Note: Each protein requires a distinct dye/protein ratio, which also depends on the properties of dyes. Over-labeling of a protein could detrimentally affect its binding affinity, while the protein conjugates of low dye/protein ratio give reduced sensitivity.

Run conjugation reaction
  1. Use a 10:1 molar ratio of Solution B (dye)/Solution A (protein) as the starting point:  Add 5 µL of the dye stock solution (Solution B, assuming the dye stock solution is 10 mM) into the vial of the protein solution (95 µL of Solution A) with effective shaking. The concentration of the protein is ~0.05 mM assuming the protein concentration is 10 mg/mL, and the molecular weight of the protein is ~200KD.

    Note: We recommend using a 10:1 molar ratio of Solution B (dye)/Solution A (protein). If it is too less or too high, determine the optimal dye/protein ratio at 5:1, 15:1, and 20:1, respectively.

  2. Continue to rotate or shake the reaction mixture at room temperature for 30-60 minutes.

Purify the conjugation

The following protocol is an example of dye-protein conjugate purification by using a Sephadex G-25 column.

  1. Prepare Sephadex G-25 column according to the manufacture instruction.
  2. Load the reaction mixture (From "Run conjugation reaction") to the top of the Sephadex G-25 column.
  3. Add PBS (pH 7.2-7.4) as soon as the sample runs just below the top resin surface.
  4. Add more PBS (pH 7.2-7.4) to the desired sample to complete the column purification. Combine the fractions that contain the desired dye-protein conjugate.

    Note: For immediate use, the dye-protein conjugate must be diluted with staining buffer, and aliquoted for multiple uses.

    Note: For longer-term storage, the dye-protein conjugate solution needs to be concentrated or freeze-dried.

Calculators


Common stock solution preparation

Table 1. Volume of DMSO needed to reconstitute specific mass of iFluor® 445 succinimidyl ester to given concentration. Note that volume is only for preparing stock solution. Refer to sample experimental protocol for appropriate experimental/physiological buffers.

0.1 mg0.5 mg1 mg5 mg10 mg
1 mM103.305 µL516.524 µL1.033 mL5.165 mL10.33 mL
5 mM20.661 µL103.305 µL206.609 µL1.033 mL2.066 mL
10 mM10.33 µL51.652 µL103.305 µL516.524 µL1.033 mL

Molarity calculator

Enter any two values (mass, volume, concentration) to calculate the third.

Mass (Calculate)Molecular weightVolume (Calculate)Concentration (Calculate)Moles
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Spectrum


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spectrum

Spectral properties

Excitation (nm)446
Emission (nm)558

Product Family


NameExcitation (nm)Emission (nm)Extinction coefficient (cm -1 M -1)Quantum yieldCorrection Factor (260 nm)Correction Factor (280 nm)
iFluor® 350 succinimidyl ester3454502000010.9510.830.23
iFluor® 405 succinimidyl ester4034273700010.9110.480.77
iFluor® 488 succinimidyl ester4915167500010.910.210.11
iFluor® 514 succinimidyl ester5115277500010.8310.2650.116
iFluor® 532 succinimidyl ester5375609000010.6810.260.16
iFluor® 555 succinimidyl ester55757010000010.6410.230.14
iFluor® 594 succinimidyl ester58760320000010.5310.050.04
iFluor® 633 succinimidyl ester64065425000010.2910.0620.044
iFluor® 647 succinimidyl ester65667025000010.2510.030.03
iFluor® 660 succinimidyl ester66367825000010.2610.070.08
iFluor® 680 succinimidyl ester68470122000010.2310.0970.094
iFluor® 700 succinimidyl ester69071322000010.2310.090.04
iFluor® 750 succinimidyl ester75777927500010.1210.0440.039
iFluor® 610 succinimidyl ester61062811000010.8510.320.49
iFluor® 710 succinimidyl ester71773919000010.6010.120.07
iFluor® 790 succinimidyl ester78781225000010.1310.10.09
iFluor® 800 succinimidyl ester80182025000010.1110.030.08
iFluor® 810 succinimidyl ester81182225000010.0510.090.15
iFluor® 820 succinimidyl ester82285025000010.110.16
iFluor® 860 succinimidyl ester85387825000010.10.14
iFluor® 546 succinimidyl ester54155710000010.6710.250.15
iFluor® 568 succinimidyl ester56858710000010.5710.340.15
iFluor® 430 succinimidyl ester4334984000010.7810.680.3
iFluor® 450 succinimidyl ester4515024000010.8210.450.27
iFluor® 840 succinimidyl ester8368792000001-0.20.09
iFluor® 560 succinimidyl ester56057112000010.5710.04820.069
iFluor® 670 succinimidyl ester67168220000010.5510.030.033
iFluor® 460 succinimidyl ester468493800001~0.810.980.46
iFluor® 440 succinimidyl ester4344804000010.6710.3520.229
iFluor® 665 succinimidyl ester667692110,00010.2210.120.09
iFluor® 690 succinimidyl ester68570422000010.3010.090.06
iFluor® 720 succinimidyl ester71674024000010.1410.150.13
iFluor® 740 succinimidyl ester74076422500010.2010.160.16
iFluor® 597 succinimidyl ester59861810000010.710.3350.514
iFluor® 770 succinimidyl ester77779725000010.160.090.08
iFluor® 780 succinimidyl ester78480825000010.1610.130.12
iFluor® 570 succinimidyl ester55757012000010.581--
iFluor® 830 succinimidyl ester830867----
iFluor® 675 succinimidyl ester683700---0.066
iFluor® 620 succinimidyl ester621636---0.04
iFluor® 605 succinimidyl ester603623----
iFluor® 625 succinimidyl ester624640----
iFluor® 510 succinimidyl ester511530----
iFluor® 540 succinimidyl ester540557---0.105
iFluor® 500 succinimidyl ester501520----
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Images


References


View all 40 references: Citation Explorer
Visualization of preimplantation uterine fluid absorption in mice using Alexa Fluor™ 488 hydrazide.
Authors: Li, Yuehuan and Martin, Taylor Elijah and Hancock, Jonathan Matthew and Li, Rong and Viswanathan, Suvitha and Lydon, John P and Zheng, Yi and Ye, Xiaoqin
Journal: Biology of reproduction (2022)
Alexa Fluor 488-conjugated cholera toxin subunit B optimally labels neurons 3-7 days after injection into the rat gastrocnemius muscle.
Authors: Cui, Jing-Jing and Wang, Jia and Xu, Dong-Sheng and Wu, Shuang and Guo, Ya-Ting and Su, Yu-Xin and Liu, Yi-Han and Wang, Yu-Qing and Jing, Xiang-Hong and Bai, Wan-Zhu
Journal: Neural regeneration research (2022): 2316-2320
Click-iT ® Plus OPP Alexa Fluor ® Protein Synthesis Assay in Embryonic Cells.
Authors: Li, Yan and Ji, Xu and Chang, Lu and Tang, Jianan and Hua, Min-Min and Liu, Jing and O'Neill, Christopher and Huang, Xuefeng and Jin, Xingliang
Journal: Bio-protocol (2022): e4441
Evaluation of Blood-Brain Barrier Integrity Using Vascular Permeability Markers: Evans Blue, Sodium Fluorescein, Albumin-Alexa Fluor Conjugates, and Horseradish Peroxidase.
Authors: Ahishali, Bulent and Kaya, Mehmet
Journal: Methods in molecular biology (Clifton, N.J.) (2021): 87-103
Effects of Viscosity and Refractive Index on the Emission and Diffusion Properties of Alexa Fluor 405 Using Fluorescence Correlation and Lifetime Spectroscopies.
Authors: van Zanten, Camila and Melnikau, Dzmitry and Ryder, Alan G
Journal: Journal of fluorescence (2021): 835-845
Molecular and Spectroscopic Characterization of Green and Red Cyanine Fluorophores from the Alexa Fluor and AF Series*.
Authors: Gebhardt, Christian and Lehmann, Martin and Reif, Maria M and Zacharias, Martin and Gemmecker, Gerd and Cordes, Thorben
Journal: Chemphyschem : a European journal of chemical physics and physical chemistry (2021)
Molecular and Spectroscopic Characterization of Green and Red Cyanine Fluorophores from the Alexa Fluor and AF Series.
Authors: Gebhardt, Christian and Lehmann, Martin and Reif, Maria M and Zacharias, Martin and Gemmecker, Gerd and Cordes, Thorben
Journal: Chemphyschem : a European journal of chemical physics and physical chemistry (2021): 1546
Hot-Band Anti-Stokes Fluorescence Properties of Alexa Fluor 568.
Authors: Gajdos, Tamás and Hopp, Béla and Erdélyi, Miklós
Journal: Journal of fluorescence (2020): 437-443
Photo-isomerization of the Cyanine Dye Alexa-Fluor 647 (AF-647) in the Context of dSTORM Super-Resolution Microscopy.
Authors: Karlsson, Joshua K G and Laude, Alex and Hall, Michael J and Harriman, Anthony
Journal: Chemistry (Weinheim an der Bergstrasse, Germany) (2019): 14983-14998
Observing the Reversible Single Molecule Electrochemistry of Alexa Fluor 647 Dyes by Total Internal Reflection Fluorescence Microscopy.
Authors: Fan, Sanjun and Webb, James E A and Yang, Ying and Nieves, Daniel J and Gonçales, Vinicius R and Tran, Jason and Hilzenrat, Geva and Kahram, Mohaddeseh and Tilley, Richard D and Gaus, Katharina and Gooding, J Justin
Journal: Angewandte Chemie (International ed. in English) (2019): 14495-14498