Name: SunRed™ SE
Brand: AAT Bioquest
SKU: 472
Availability: InStock

SunRed™ SE

Although sulforhodamine 101 acid chloride (also called Texas Red®) is the most popular labeling reagent of sulfonyl chloride, it is quite unstable in water, especially at the higher pH required for reaction with aliphatic amines. Texas Red (TR) reacts with both aliphatic amines and aromatic amines indiscriminatingly. In addition, the labeling efficiency of Texas Red is extremely low compared to dye succinimidyl esters. SunRed™ SE is a succinimidyl ester. It is an excellent replacement for Texas Red. SunRed reacts with amine compounds such as amino acids, peptides and proteins to give bright red fluorescent conjugates that are extremely stable. Compared to Texas Red, SunRed has much higher labeling efficiency, and more importantly the resulted conjugate is more fluorescent and water soluble than the corresponding Texas Red conjugate. The conjugates of SunRed have the identical excitation and emission wavelengths to those of Texas Red. Our in-house studies indicated that SunRed is more stable than Texas Red under the same labeling conditions. It is extremely useful for labeling hydrophobic peptides, giving the fluorescent conjugates that are much easier to be purified and more water soluble to use.

Protocol

COO

COA

Catalog	Size	Price	Quantity
472	5 mg	Price
478	1 mg	Price

Calculators

Common stock solution preparation

Table 1. Volume of DMSO needed to reconstitute specific mass of SunRed™ 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	89.02 µL	445.101 µL	890.202 µL	4.451 mL	8.902 mL
5 mM	17.804 µL	89.02 µL	178.04 µL	890.202 µL	1.78 mL
10 mM	8.902 µL	44.51 µL	89.02 µL	445.101 µL	890.202 µL

Molarity calculator

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

Mass (Calculate)		Molecular weight		Volume (Calculate)		Concentration (Calculate)		Moles
mg	÷	1123.34 g/mol	=	mL	x	mM	=	mmol

References

View all 63 references: Citation Explorer

Fluorescence properties of fluorescein, tetramethylrhodamine and Texas Red linked to a DNA aptamer

Authors:

Unruh JR, Gokulrangan G, Wilson GS, Johnson CK.

Journal:

Photochem Photobiol (2005): 682

A comparative study of the potential of solid triglyceride nanostructures coated with chitosan or poly(ethylene glycol) as carriers for oral calcitonin delivery

Authors:

Garcia-Fuentes M, Prego C, Torres D, Alonso MJ.

Journal:

Eur J Pharm Sci (2005): 133

Bead-based cellular analysis, sorting and multiplexing

Authors:

Sanchez-Martin RM, Muzerelle M, Chitkul N, How SE, Mittoo S, Bradley M.

Journal:

Chembiochem (2005): 1341

Transepithelial transport of fluorescent p-glycoprotein and MRP2 substrates by insect Malpighian tubules: confocal microscopic analysis of secreted fluid droplets

Authors:

Leader JP, O'Donnell MJ.

Journal:

J Exp Biol (2005): 4363

Purification and fluorescent labeling of the human serotonin transporter

Authors:

Rasmussen SG, Gether U.

Journal:

Biochemistry (2005): 3494

Physical properties

Molecular weight	1123.34
Solvent	DMSO

Spectral properties

Correction factor (280 nm)	0.366
Excitation (nm)	592
Emission (nm)	609

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
Storage	Freeze (< -15 °C); Minimize light exposure
UNSPSC	12171501

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Page updated on October 5, 2025