mFluor™ Violet 550 SE

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Telephone	1-800-990-8053
Fax	1-800-609-2943
Email	sales@aatbio.com
International	See distributors
Bulk request	Inquire
Custom size	Inquire
Shipping	Standard overnight for United States, inquire for international

Physical properties

Molecular weight	1125.2
Solvent	DMSO

Spectral properties

Absorbance (nm)	527
Correction Factor (260 nm)	0.474
Correction Factor (280 nm)	0.306
Extinction coefficient (cm ^-1 M ^-1)	90000¹
Excitation (nm)	527
Emission (nm)	550
Quantum yield	0.31¹

Storage, safety and handling

H-phrase	H303, H313, H333
Hazard symbol	XN
Intended use	Research Use Only (RUO)
R-phrase	R20, R21, R22
Storage	Freeze (< -15 °C); Minimize light exposure
UNSPSC	12171501

Overview SDS Protocol

Molecular weight

1125.2

Absorbance (nm)

527

Correction Factor (260 nm)

0.474

Correction Factor (280 nm)

0.306

Extinction coefficient (cm ^-1 M ^-1)

90000¹

Excitation (nm)

527

Emission (nm)

550

Quantum yield

0.31¹

mFluor™ dyes are developed for multicolor flow cytometry-focused applications. These dyes have large Stokes Shifts, and can be well excited by the laser lines of flow cytometers (e.g., 405 nm, 488 nm and 633 nm). mFluor™ Violet dyes are optimized to be excited with a violet laser at 405 nm. AAT Bioquest offers the largest collection of fluorescent dyes that are excited by violet laser. mFluor™ Violet 550 dyes have fluorescence excitation and emission maxima of ~405 nm and ~550 nm respectively. These spectral characteristics make them a unique color for flow cytometry application. mFluor™ Violet 550 SE is reasonably stable and shows good reactivity and selectivity with protein amino groups. mFluor™ Violet 550 SE provides a convenient tool to label monoclonal, polyclonal antibodies or other proteins (>10 kDa) for flow cytometric applications with the violet laser excitation.

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. mFluor™ Violet 550 SE stock solution (Solution B)

Add anhydrous DMSO into the vial of mFluor™ Violet 550 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 mFluor™ Violet 550 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

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.
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.

Prepare Sephadex G-25 column according to the manufacture instruction.
Load the reaction mixture (From "Run conjugation reaction") to the top of the Sephadex G-25 column.
Add PBS (pH 7.2-7.4) as soon as the sample runs just below the top resin surface.
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.

Calculators

Common stock solution preparation

Table 1. Volume of DMSO needed to reconstitute specific mass of mFluor™ Violet 550 SE to given concentration. Note that volume is only for preparing stock solution. Refer to sample experimental protocol for appropriate experimental/physiological buffers.

	0.1 mg	0.5 mg	1 mg	5 mg	10 mg
1 mM	88.873 µL	444.365 µL	888.731 µL	4.444 mL	8.887 mL
5 mM	17.775 µL	88.873 µL	177.746 µL	888.731 µL	1.777 mL
10 mM	8.887 µL	44.437 µL	88.873 µL	444.365 µL	888.731 µL

Molarity calculator

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Spectrum

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Spectral properties

Absorbance (nm)	527
Correction Factor (260 nm)	0.474
Correction Factor (280 nm)	0.306
Extinction coefficient (cm ^-1 M ^-1)	90000¹
Excitation (nm)	527
Emission (nm)	550
Quantum yield	0.31¹

Product Family

Name	Excitation (nm)	Emission (nm)	Extinction coefficient (cm ^-1 M ^-1)	Quantum yield	Correction Factor (260 nm)	Correction Factor (280 nm)
mFluor™ Violet 450 SE	406	445	35000¹	0.81¹	0.338	0.078
mFluor™ Violet 510 SE	412	505	25000¹	0.86¹	0.464	0.366
mFluor™ Violet 540 SE	402	535	18000¹	0.21¹	1.326	0.543
mFluor™ Violet 500 SE	410	501	25000¹	0.81¹	0.769	0.365
mFluor™ Violet 610 SE	594	612	90000¹	0.3¹	0.532	0.66
mFluor™ Violet 505 SE	393	504	40000¹	0.45¹	0.888	0.403
mFluor™ Violet 590 SE	564	591	90000¹	0.22¹	0.632	0.329
mFluor™ Violet 545 SE	393	543	20000¹	0.15¹	1.08	0.496
mFluor™ Violet 530 SE	393	543	20000¹	-	-	-
mFluor™ Violet 480 SE	404	475	40,000	-	1.23	0.6570
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Images

Figure 1. Top) Spectral pattern was generated using a 4-laser spectral cytometer. Spatially offset lasers (355 nm, 405 nm, 488 nm, and 640 nm) were used to generate four distinct emission profiles, then, when combined, yielded the overall spectral signature. Bottom) Flow cytometry analysis of whole blood cells stained with CD4-mFluor™ Violet 550 conjugate. The fluorescence signal was monitored using an Aurora spectral flow cytometer in the mFluor™ Violet 550 specific V7-A channel.

Fluorescent dye NHS esters (or succinimidyl esters) are the most popular tool for conjugating dyes to a peptide, protein, antibody, amino-modified oligonucleotide, or nucleic acid. NHS esters react readily with the primary amines (R-NH<sub>2</sub>) of proteins, amine-modified oligonucleotides, and other amine-containing molecules. The resulting dye conjugates are quite stable.

Figure 2. Fluorescent dye NHS esters (or succinimidyl esters) are the most popular tool for conjugating dyes to a peptide, protein, antibody, amino-modified oligonucleotide, or nucleic acid. NHS esters react readily with the primary amines (R-NH₂) of proteins, amine-modified oligonucleotides, and other amine-containing molecules. The resulting dye conjugates are quite stable.

References

View all 8 references: Citation Explorer

High throughput pSTAT signaling profiling by fluorescent cell barcoding and computational analysis.
Authors: Tsai, Wanxia Li and Vian, Laura and Giudice, Valentina and Kieltyka, Jacqueline and Liu, Christine and Fonseca, Victoria and Gazaniga, Nathalia and Gao, Shouguo and Kajigaya, Sachiko and Young, Neal S and Biancotto, Angélique and Gadina, Massimo
Journal: Journal of immunological methods (2020): 112667

Lot-to-lot stability of antibody reagents for flow cytometry.
Authors: Böttcher, Sebastian and van der Velden, Vincent H J and Villamor, Neus and Ritgen, Matthias and Flores-Montero, Juan and Escobar, Hugo Murua and Kalina, Tomas and Brüggemann, Monika and Grigore, Georgiana and Martin-Ayuso, Marta and Lecrevisse, Quentin and Pedreira, Carlos E and van Dongen, Jacques J M and Orfao, Alberto
Journal: Journal of immunological methods (2019): 112294

First record of Doleschallia tongana (Lepidoptera: Nymphalidae) for Guam Island.
Authors: Manuel, Jake and Tennent, W John and Buden, Donald W and Moore, Aubrey
Journal: F1000Research (2018): 366

Optimization and standardization of fluorescent cell barcoding for multiplexed flow cytometric phenotyping.
Authors: Giudice, Valentina and Feng, Xingmin and Kajigaya, Sachiko and Young, Neal S and Biancotto, Angélique
Journal: Cytometry. Part A : the journal of the International Society for Analytical Cytology (2017): 694-703

Quantification of mitochondrial reactive oxygen species in living cells by using multi-laser polychromatic flow cytometry.
Authors: De Biasi, Sara and Gibellini, Lara and Bianchini, Elena and Nasi, Milena and Pinti, Marcello and Salvioli, Stefano and Cossarizza, Andrea
Journal: Cytometry. Part A : the journal of the International Society for Analytical Cytology (2016): 1106-1110

The new violet laser dye, Krome Orange, allows an optimal polychromatic immunophenotyping based on CD45-KO gating.
Authors: Preijers, Frank W M B and Huys, Erik and Leenders, Marij and Nieto, Laura and Gautherot, Emmanuel and Moshaver, Bijan
Journal: Journal of immunological methods (2011): 42-51

Tyramide signal amplification for analysis of kinase activity by intracellular flow cytometry.
Authors: Clutter, Matthew R and Heffner, Garrett C and Krutzik, Peter O and Sachen, Kacey L and Nolan, Garry P
Journal: Cytometry. Part A : the journal of the International Society for Analytical Cytology (2010): 1020-31

Violet laser diodes in flow cytometry: an update.
Authors: Telford, William and Kapoor, Veena and Jackson, James and Burgess, Walter and Buller, Gayle and Hawley, Teresa and Hawley, Robert
Journal: Cytometry. Part A : the journal of the International Society for Analytical Cytology (2006): 1153-60