ReadiLink™ xtra Rapid iFluor® 488 Antibody Labeling Kit BSA-Compatible

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Telephone	1-800-990-8053
Fax	1-800-609-2943
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Spectral properties

Correction Factor (260 nm)	0.21
Correction Factor (280 nm)	0.11
Extinction coefficient (cm ^-1 M ^-1)	75000¹
Excitation (nm)	491
Emission (nm)	516
Quantum yield	0.9¹

Storage, safety and handling

Certificate of Origin	Download PDF
H-phrase	H303, H313, H333
Hazard symbol	XN
Intended use	Research Use Only (RUO)
R-phrase	R20, R21, R22
UNSPSC	12171501

Overview SDS Protocol

Correction Factor (260 nm)

0.21

Correction Factor (280 nm)

0.11

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

75000¹

Excitation (nm)

491

Emission (nm)

516

Quantum yield

0.9¹

ReadiLink™ xtra rapid antibody labeling kits require essentially only 2 simple mixing steps without a column purification needed. Preactivated iFluor® 488 used in this ReadiLink™ kit is quite stable and shows good reactivity and selectivity with antibodies. The kit has all the essential components for labeling ~2x50 ug antibody. Each of the two vials of preactivated iFluor® 488 dye provided in the kit is optimized for labeling ~50 µg antibody. ReadiLink™ xtra iFluor® 488 rapid antibody labeling kit provides a convenient and robust method to label monoclonal and polyclonal antibodies with the bright green fluorescent iFluor® 488 fluorophore. AAT Bioquest's iFluor® dyes 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 and 633 nm).

Figure 1. Overview of the ReadiLink™ xtra Rapid Antibody Labeling protocol. In just two simple steps, and with no purification necessary, covalently label microgram amounts of antibodies in under an hour.

Components

Example protocol

AT A GLANCE

Important

Warm all the components and centrifuge the vials briefly before opening, and immediately prepare the required solutions before starting your conjugation. The following protocol is for recommendation.

PREPARATION OF WORKING SOLUTION

Protein working solution (Solution A)

For labeling 50 µg of protein (assuming the target protein concentration is 1 mg/mL), mix 5 µL (10% of the total reaction volume) of Reaction Buffer (Component B) with 50 µL of the target protein solution.
Note     If you have a different protein concentration, adjust the protein volume accordingly to make ~50 µg of protein available for your labeling reaction.
Note     For labeling 100 µg of protein (assuming the target protein concentration is 1 mg/mL), mix 10 µL (10% of the total reaction volume) of Reaction Buffer (Component B) with 100 µL of the target protein solution.
Note     The protein should be dissolved in 1X phosphate buffered saline (PBS), pH 7.2 - 7.4; if the protein is dissolved in glycine buffer, it must be dialyzed against 1X PBS, pH 7.2 - 7.4, or use Amicon Ultra-0.5, Ultracel-10 Membrane, 10 kDa (cat# UFC501008 from Millipore) 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) with 0.1 to 0.5 % will be labeled well.
Note     For optimal labeling efficiency, a final protein concentration range of 1 - 2 mg/mL is recommended, with a significantly reduced conjugation efficiency at less than 1 mg/mL.

SAMPLE EXPERIMENTAL PROTOCOL

Run conjugation reaction

Add the protein working solution (Solution A) to ONE vial of labeling dye (Component A), and mix them well by repeatedly pipetting for a few times or vortex the vial for a few seconds.
Note If labeling 100 µg of protein, use both vials (Component A) of labeling dye by dividing the 100 µg of protein into 2 x 50 µg of protein and reacting each 50 µg of protein with one vial of labeling dye. Then combine both vials for the next step.
Keep the conjugation reaction mixture at room temperature for 30 - 60 minutes.
Note The conjugation reaction mixture can be rotated or shaken for longer time if desired.

Stop Conjugation reaction

Add 5 µL (for 50 µg protein) or 10 µL (for 100 µg protein) which is 10% of the total reaction volume of TQ™-Dyed Quench Buffer (Component C) into the conjugation reaction mixture; mix well.
Incubate at room temperature for 10 minutes. The labeled protein (antibody) is now ready to use.

Storage of Protein Conjugate

The protein conjugate should be stored at > 0.5 mg/mL in the presence of a carrier protein (e.g., 0.1% bovine serum albumin). For longer storage, the protein conjugates could be lyophilized or divided into single-used aliquots and stored at ≤ –20 °C.

Spectrum

Open in Advanced Spectrum Viewer

Spectral properties

Correction Factor (260 nm)	0.21
Correction Factor (280 nm)	0.11
Extinction coefficient (cm ^-1 M ^-1)	75000¹
Excitation (nm)	491
Emission (nm)	516
Quantum yield	0.9¹

Product Family

Name	Excitation (nm)	Emission (nm)	Extinction coefficient (cm ^-1 M ^-1)	Quantum yield	Correction Factor (260 nm)	Correction Factor (280 nm)
ReadiLink™ xtra Rapid iFluor® 350 Antibody Labeling Kit BSA-Compatible	345	450	20000¹	0.95¹	0.83	0.23
ReadiLink™ xtra Rapid iFluor® 555 Antibody Labeling Kit BSA-Compatible	557	570	100000¹	0.64¹	0.23	0.14
ReadiLink™ xtra Rapid iFluor® 594 Antibody Labeling Kit BSA-Compatible	588	604	180000¹	0.53¹	0.05	0.04
ReadiLink™ xtra Rapid iFluor® 647 Antibody Labeling Kit BSA-Compatible	656	670	250000¹	0.25¹	0.03	0.03
ReadiLink™ xtra Rapid iFluor® 750 Antibody Labeling Kit BSA-Compatible	757	779	275000¹	0.12¹	0.044	0.039

Images

Figure 1. Immunofluorescence staining of tubulin in HeLa cells. HeLa cells were fixed with 4% PFA, permeabilized with 0.1% Triton X-100 and blocked. Cells were then incubated with mouse anti-tubulin antibody (1ug/ml) and stained with a goat anti-mouse IgG conjugate (5ug/ml) labeled using different methods:

GXM IgG-iFluor®488 (Cat#16448)
50ug GXM IgG in PBS with ReadiLink™ Rapid iFluor® 488 Antibody Labeling Kit (Cat#1255)
50ug GXM IgG in PBS + 0.05% BSA with ReadiLink™ Rapid iFluor® 488 Antibody Labeling Kit (Cat#1255)
50ug GXM IgG in PBS + 0.05% BSA with ReadiLink™ xtra Rapid iFluor® 488 Antibody Labeling Kit (Cat#1955)
50ug GXM IgG in PBS + 0.5% BSA with ReadiLink™ xtra Rapid iFluor® 488 Antibody Labeling Kit (Cat#1955)
GXM IgG-Alexa Fluor 488 (Vendor J)

Figure 2. Flow cytometry analysis of HL-60 cells stained with 1 µg/mL Mouse IgG control (Green) or with 1 µg/mL Anti-Human CD45-iFluor® 488 (Red) prepared using the ReadiLink™ xtra Rapid iFluor® 488 Antibody Labeling Kit (Cat No. 1955). The fluorescence signal was monitored using an ACEA NovoCyte flow cytometer in the FITC channel.

Figure 3. Immunofluorescence staining of tubulin in HeLa cells. HeLa cells were fixed with 4% PFA, permeabilized with 0.1% Triton X-100 and blocked. Cells were then incubated with mouse anti-tubulin antibody and stained with a goat anti-mouse IgG labeled using the ReadiLink™ xtra Rapid iFluor® 488 Antibody Labeling Kit (Cat No. 1955).

References

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