Texas Red-X, succinimidyl ester *Mixed isomers* *CAS 216972-99-5*

Texas Red-X, succinimidyl ester

Mixed isomers; CAS 216972-99-5

The amine-reactive Texas Red®-X, succinimidyl ester is a superior replacement to Texas Red (Texas Red® is the trademark of Invitrogen). It has the same spectral properties to Texas Red, but it is much easier conjugated to a biomolecure with much higher conjugation yield. It can be used to create bright red-fluorescent bioconjugates with excitation/emission maxima ~595/615 nm. Compared to Texas Red®, this reactive dye contains an additional seven-atom aminohexanoyl spacer ("X") between the fluorophore and the succinimidyl ester group. This spacer helps to separate the fluorophore from its point of attachment, potentially reducing the interaction of the fluorophore with the biomolecule to which it is conjugated. This product contains the mixed 2- and 5-isomers with a variable batch-dependent ratio. We also offer the single 5-isomer (#474) that gives more reproducible results for critical productions.

Catalog	Size	Price	Quantity
475	5 mg	Price

Calculators

Common stock solution preparation

Table 1. Volume of DMSO needed to reconstitute specific mass of Texas Red-X, succinimidyl ester *Mixed isomers* *CAS 216972-99-5* 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	122.408 µL	612.04 µL	1.224 mL	6.12 mL	12.241 mL
5 mM	24.482 µL	122.408 µL	244.816 µL	1.224 mL	2.448 mL
10 mM	12.241 µL	61.204 µL	122.408 µL	612.04 µL	1.224 mL

Molarity calculator

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

Mass (Calculate)		Molecular weight		Volume (Calculate)		Concentration (Calculate)		Moles
mg	÷	816.94 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	816.94
Solvent	DMSO

Spectral properties

Correction factor (260 nm)	0.23
Correction factor (280 nm)	0.36
Correction factor (565 nm)	0.4472
Extinction coefficient (cm ^-1 M ^-1)	116000 ¹
Excitation (nm)	586
Emission (nm)	603
Quantum yield	0.97 ¹ , 0.93 ²

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
CAS	216972-99-5

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Page updated on October 13, 2025