logo
AAT Bioquest

iFluor® 440 succinimidyl ester

AAT Bioquest's iFluor® dyes are optimized for labeling proteins, particularly 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, and 633 nm). iFluor® 440 dyes are designed to be a superior replacement for DEAC dye that has extremely poor water solubility. iFluor® 440 SE is reasonably stable and shows good reactivity and selectivity with protein amino groups. Under the same conditions, iFluor® 440 dye conjugates are significantly brighter than the corresponding bioconjugates of DEAC or other spectrally similar dyes (such as SpectrumAqua), making the iFluor® 440 conjugates much more sensitive.

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.

1. Protein stock solution (Solution A)
Mix 100 µL of a reaction buffer (e.g., 1 M  sodium carbonate solution or 1 M phosphate buffer with pH ~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. For optimal labeling efficiency the final protein concentration range of 2-10 mg/mL is recommended.


2. iFluor™ 440 SE stock solution (Solution B)
Add anhydrous DMSO into the vial of iFluor™ 440 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 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™ 440 SE. You might need further optimization for your particular proteins.
Note     Each protein requires distinct dye/protein ratio, which also depends on the properties of dyes. Over labeling of a protein could detrimentally affects its binding affinity while the protein conjugates of low dye/protein ratio gives reduced sensitivity.


Run conjugation reaction
  1. Use 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 to use 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 need be diluted with staining buffer, and aliquoted for multiple uses.
    Note     For longer term storage, dye-protein conjugate solution need be concentrated or freeze dried. 

Spectrum

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 ester71673915000010.6010.120.07
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® 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® 445 succinimidyl ester446558----
iFluor® 500 succinimidyl ester501520----
Show More (36)

References

View all 12 references: Citation Explorer
7-(Diethylamino)coumarin-3-carboxylic acid as derivatization reagent for 405 nm laser-induced fluorescence detection: A case study for the analysis of sulfonamides by capillary electrophoresis.
Authors: Wu, Chengxin and Sun, Yuanyuan and Wang, Yuanhang and Duan, Wenzhen and Hu, Jiangyue and Zhou, Lei and Pu, Qiaosheng
Journal: Talanta (2019): 16-22
Design, synthesis and perception of fluorescently labeled isoprenoid cytokinins.
Authors: Kubiasová, Karolina and Mik, Václav and Nisler, Jaroslav and Hönig, Martin and Husičková, Alexandra and Spíchal, Lukáš and Pěkná, Zuzana and Šamajová, Olga and Doležal, Karel and Plíhal, Ondřej and Benková, Eva and Strnad, Miroslav and Plíhalová, Lucie
Journal: Phytochemistry (2018): 1-11
Intracellular Uncaging of cGMP with Blue Light.
Authors: Agarwal, Hitesh K and Zhai, Shenyu and Surmeier, D James and Ellis-Davies, Graham C R
Journal: ACS chemical neuroscience (2017): 2139-2144
Wavelength-selective one- and two-photon uncaging of GABA.
Authors: Amatrudo, Joseph M and Olson, Jeremy P and Lur, G and Chiu, Chiayu Q and Higley, Michael J and Ellis-Davies, Graham C R
Journal: ACS chemical neuroscience (2014): 64-70
A water soluble fluorescent polymer as a dual colour sensor for temperature and a specific protein.
Authors: Inal, Sahika and Kölsch, Jonas D and Sellrie, Frank and Schenk, Jörg A and Wischerhoff, Erik and Laschewsky, André and Neher, Dieter
Journal: Journal of materials chemistry. B (2013): 6373-6381
Page updated on October 28, 2024

Ordering information

Price
Unit size
1 mg
100 ug
5 mg
10 mg
Catalog Number
Quantity
Add to cart

Additional ordering information

Telephone1-800-990-8053
Fax1-800-609-2943
Emailsales@aatbio.com
InternationalSee distributors
Bulk requestInquire
Custom sizeInquire
Technical SupportContact us
Purchase orderSend to sales@aatbio.com
ShippingStandard overnight for United States, inquire for international
Request quotation

Physical properties

Molecular weight

692.83

Solvent

DMSO

Spectral properties

Absorbance (nm)

430

Correction Factor (260 nm)

0.352

Correction Factor (280 nm)

0.229

Extinction coefficient (cm -1 M -1)

400001

Excitation (nm)

434

Emission (nm)

480

Quantum yield

0.671

Storage, safety and handling

Certificate of OriginDownload PDF
H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22

Storage

Freeze (< -15 °C); Minimize light exposure
UNSPSC12171501