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Texas Red-X, succinimidyl ester *Single isomer* *178623-11-5*

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Physical properties
Molecular weight816.94
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)1160001
Excitation (nm)586
Emission (nm)603
Quantum yield0.971, 0.932
Storage, safety and handling
Certificate of OriginDownload PDF
H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22
StorageFreeze (< -15 °C); Minimize light exposure


Molecular weight
Correction Factor (260 nm)
Correction Factor (280 nm)
Correction Factor (565 nm)
Extinction coefficient (cm -1 M -1)
Excitation (nm)
Emission (nm)
Quantum yield
0.971, 0.932
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. Compared to the mixed isomers (#474), this product is the single 5-isomer, giving more reproducible results.


Common stock solution preparation

Table 1. Volume of DMSO needed to reconstitute specific mass of Texas Red-X, succinimidyl ester *Single isomer* *178623-11-5* to given concentration. Note that volume is only for preparing stock solution. Refer to sample experimental protocol for appropriate experimental/physiological buffers.

0.1 mg0.5 mg1 mg5 mg10 mg
1 mM122.408 µL612.04 µL1.224 mL6.12 mL12.241 mL
5 mM24.482 µL122.408 µL244.816 µL1.224 mL2.448 mL
10 mM12.241 µL61.204 µL122.408 µL612.04 µL1.224 mL

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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)1160001
Excitation (nm)586
Emission (nm)603
Quantum yield0.971, 0.932



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